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variables of Algol type 
(brighter mag 5.0 in maximum)


Name

max. magnitude

min. magnitude
or
mag. amplitude (*)

period
[days]

MK spectral class

b Aur

1.89

1.98

3.960042

A2IV+A2IV-V

b Per

2.12

3.39

2.867304

B8V

d Ori

2.14

2.26

5.732476

O9.5II-III+B0III

a CrB

2.21

2.32

17.35991

A0V+G5V

d Cas

2.68

2.76

759

A5V

d Cap

2.81

3.05

1.022769

A7mIII

e Aur

2.92

3.83

9892

A8Ia-F2epIa+BV

n Ori

3.31

3.6

7.989268

B0.5Vea+B3V

l Tau

3.37

3.91

3.952948

B3V+A4IV

g Per

3.63

4.18

 

 

z Aur

3.7

0.55*

972.16

K5II+B7V

V0695 Cyg

3.73

3.89

3784.3

K4Iab+B4IV-V

m Sgr

3.8

3.88

180.55

B8eqIa+B1.5V

V1488 Cyg

3.9

4.14

1147.4

K5Iab+B4IV-V

z Phe

3.91

4.42

1.669767

B6V+B9V

t Per

3.94

4.07

 

 

e UMi

4.19

4.23

39.4809

G5III

V0415 Car

4.39

0.06*

 

 

VV Cep

4.8

5.36

7430

M2epIa-Iab+B8:eV

AR Cas

4.82

4.96

6.066331

B3IV-V

d Lib

4.91

5.9

2.327354

A0IV-V

 

 

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) b Aur

note (category: star names):

Menkalinan; Menkalina.

position, motion, parallax:

position (J2000)

RA: 5h 59min 31.7sec

DEC: +44° 56' 51''

position (2000.73)

RA: 5h 59min 35sec

DEC: +44° 56' 51''

position (B1900)

RA: 5h 52min 11.5sec

DEC: +44° 56' 15''

proper motion (J2000)

RA: -0.057 arcsec/a

DEC: 0 arcsec/a

radial velocity

-18 km/s
note: spectroscopic binaries, double lined spectra
note: orbital data avaible

rotational velocity

37 km/s (uncertain) (variable)

trigonometric parallax

0.041 arcsec

galactic coordinates

longitude: 167.46°

latitude: 10.41°

magnitude

visual magnitude

1.9
(V on UBV Johnson system)

spectral / color information

spectral class

A2IV

B-V-magnitude

0.03

U-B-magnitude

0.05

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

Bet Aur

 

note (category: variability):

ADS 4556A, EA 1.89 - 1.98V, 1.93 - 2.02B, A2+A2, 3.9600421d, i 78.5d.

double/multiple star system information

number of components of multiple star system

3

separation

184.6 arcsec

mag difference (of double or brightest multiple)

8.9

component ID

AB

 

note (category: double and multiple data):

AB binary. C, 14.1v at 13".

 

note (category: spectroscopic binaries):

ADS 4556A, 3.9600d, K 107.5k/s, V0 -17.1k/s, msin3i 2.20, asini 5.85. Masses 2.33, 2.25 solar. Rotational velocities both components <30k/s. Second SB ever discovered, by Antonia Maury, 1889.

miscellaneous information

note (category: group membership):

In Ursa cluster; Sirius group; UMa stream; UMa cluster.

 

note (category: stellar radii or diameters):

Radius relative to Sun = 3.0.

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) b Per

note (category: star names):

ALGOL; Gorgona; Gorgonea Prima; Demon Star; El Ghoul.

position, motion, parallax:

position (J2000)

RA: 3h 8min 10.1sec

DEC: +40° 57' 20''

position (2000.73)

RA: 3h 8min 13sec

DEC: +40° 57' 30''

position (B1900)

RA: 3h 1min 39.5sec

DEC: +40° 34' 14''

proper motion (J2000)

RA: 0.004 arcsec/a

DEC: -0.001 arcsec/a

radial velocity

4 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

65 km/s (uncertain) (variable)

trigonometric parallax

0.045 arcsec

galactic coordinates

longitude: 148.98°

latitude: -14.9°

magnitude

visual magnitude

2.12
(V on UBV Johnson system)

spectral / color information

spectral class

B8V

B-V-magnitude

-0.05

U-B-magnitude

-0.37

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

B8V+G.

 

note (category: colors):

Color excess E(B-V) = +0.03.

variability information

variable star identification

Bet Per

 

note (category: variability):

ADS 2362A is the prototype Algol star, first discovered as variable by Montanari in 1669. The first period determined by Goodricke in 1783, who also interpreted the variations as due to eclipses. The prototype star proves to be a more a complicated system than most of the Algol-type stars, i.e., compact triple system with separation of the components well under 0.1". The components usually designated Algol A, B, C, sometimes A, a, P. Two formerly additionally desig- nated components D and E, inferred on the basis of an apparent 32 year apsidal motion, are now considered spurious. The various Algol components must not be confused with the visual components ADS 2362 B-E, optical companions at much greater distances from A. ADS 2362A, EA 2.12 - 3.40V, 2.86732442d, abrupt period changes. Orbital and rotation periods synchronized. Rotational velocity 65k/s. Radio flares extending to about 1 A.U., not associated with X-ray activity. Radio flare activity appears correlated with period discontinuities, attributed to "starquakes." Mass flow from K to B8 component at rate of 1.8x10E-08 solar masses/year. Possible circumstellar material associated with radio or H alpha emission.

double/multiple star system information

number of components of multiple star system

6

separation

81.9 arcsec

mag difference (of double or brightest multiple)

8.3

component ID

AD

 

note (category: double and multiple data):

A* var. B8V, 1.858y, a = 0.011" or 1.862y, a = 0.104". Apparent apsidal period 28.4y or 32y. Resolved by speckle interferometry: sep. 0.086", 2-3v fainter than primary. This may be Algol C. Four visual companions all optical: B, 12.7v at 59"; C, 12.5 at 67"; D, 10.5 at 82"; BC sep. 15"; E, 12.5v at 11" from D.

 

note (category: spectroscopic binaries):

Algol ABxC: 1.8613y, K 12.0k/s, V0 +3.7k/s, msin3i 3.91, asini 109. Spectra B8V, G5IV, Am. Mass Algol AB, 5.3 Suns; C, 1.8 Suns. Circumstellar gas fills Roche lobe of hot component. ADS 19356A: 2.8673d, K 44.0k/s, V0 var., asini 1.73. Resolved by speckle interferometry 1982.17, sep. 0.052", 1983.94, sep. 0.08".

miscellaneous information

note (category: miscellaneous):

One of the few known galactic radio sources in which the dominant star is normal. 21cm radio source.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) d Ori

note (category: star names):

MINTAKA; Mintika.

position, motion, parallax:

position (J2000)

RA: 5h 32min 0.4sec

DEC: -0° 17' 57''

position (2000.73)

RA: 5h 32min 2sec

DEC: -0° 17' 55''

position (B1900)

RA: 5h 26min 53.8sec

DEC: -0° 22' 23''

proper motion (J2000)

RA: 0.001 arcsec/a

DEC: -0.002 arcsec/a

radial velocity

16 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

152 km/s (uncertain) (variable)

trigonometric parallax

0.014 arcsec

galactic coordinates

longitude: 203.86°

latitude: -17.74°

 

note (category: radial and/or rotational velocities):

Mass ejection at up to 1800k/s.

magnitude

visual magnitude

2.23
(V on UBV Johnson system)

spectral / color information

spectral class

O9.5II

B-V-magnitude

-0.22

U-B-magnitude

-1.05

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

Nitrogen deficient. Interstellar Lyman alpha absorption observed by AEROBEE rocket. Also classified B2V, O9.5II, O9.5II-III + B0III.

 

note (category: colors):

Color excess E(B-V) = +0.07.

variability information

variable star identification

Del Ori

 

note (category: variability):

ADS 4134A, EA 2.14 - 2.26V, 1.94 - 2.13B, 5.732476d. Intrinsic variability also possible.

double/multiple star system information

number of components of multiple star system

3

separation

51.7 arcsec

mag difference (of double or brightest multiple)

4.6

component ID

AC

 

note (category: double and multiple data):

Binary with C = HR 1851. Component B, 14.0v at 33".

 

note (category: spectroscopic binaries):

ADS 4134A, 5.7324d, K 101.0k/s, V0 +20.1k/s, asini 7.92. The first SB in which stationary lines were observed.

miscellaneous information

note (category: group membership):

Ori OB1b3; Orion belt; cluster CR 70.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) a CrB

note (category: star names):

ALPHEKKA; Alphecca; Alphacca; Gemma; Gnosia; The Jewel; Gnosia Stella Coronae; Ashtaroth.

position, motion, parallax:

position (J2000)

RA: 15h 34min 41.3sec

DEC: +26° 42' 53''

position (2000.73)

RA: 15h 34min 43sec

DEC: +26° 42' 44''

position (B1900)

RA: 15h 30min 27.2sec

DEC: +27° 3' 4''

proper motion (J2000)

RA: 0.121 arcsec/a

DEC: -0.089 arcsec/a

radial velocity

2 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

133 km/s (uncertain) (variable)

trigonometric parallax

0.045 arcsec

galactic coordinates

longitude: 41.87°

latitude: 53.77°

magnitude

visual magnitude

2.23
(V on UBV Johnson system)

spectral / color information

spectral class

A0V+G5V

B-V-magnitude

-0.02

U-B-magnitude

-0.02

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

Alp CrB

 

note (category: variability):

EA 2.21 - 2.32B, 17.359907d. Possibly also intrinsic var.

 

double/multiple star system information

note (category: spectroscopic binaries):

17.3599d, K 35.8k/s, V0 +1.5k/s, asini 7.83; EB, i 88.3d.

miscellaneous information

note (category: group membership):

Sirius group; UMa stream.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) d Cas

note (category: star names):

Ruchbah; Rucba; Rucha; also Ksora in Becvar.

position, motion, parallax:

position (J2000)

RA: 1h 25min 49sec

DEC: +60° 14' 7''

position (2000.73)

RA: 1h 25min 52sec

DEC: +60° 14' 21''

position (B1900)

RA: 1h 19min 16.1sec

DEC: +59° 42' 56''

proper motion (J2000)

RA: 0.297 arcsec/a

DEC: -0.051 arcsec/a

radial velocity

7 km/s
note: spectroscopic binaries

rotational velocity

113 km/s (uncertain) (variable)

trigonometric parallax

0.037 arcsec

galactic coordinates

longitude: 127.19°

latitude: -2.35°

magnitude

visual magnitude

2.68
(V on UBV Johnson system)

spectral / color information

spectral class

A5III-IV

B-V-magnitude

0.13

U-B-magnitude

0.12

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

Also classified A5V.

 

note (category: colors):

Color excess E(B-V) = +0.27.

variability information

variable star identification

Del Cas

 

note (category: variability):

EA? 2.68 - 2.76V, 759d.

double/multiple star system information

separation

131.7 arcsec

mag difference (of double or brightest multiple)

8.7

note

Worley (1978) update of the IDS

 

note (category: double and multiple data):

Unresolved by speckle interferometry 1981.69.

miscellaneous information

note (category: group membership):

Hyades group.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) d Cap

note (category: star names):

Deneb Algedi; Deneb Algiedi; Scheddi; Sheddi.

position, motion, parallax:

position (J2000)

RA: 21h 47min 2.4sec

DEC: -16° 7' 38''

position (2000.73)

RA: 21h 47min 4sec

DEC: -16° 7' 26''

position (B1900)

RA: 21h 41min 31.3sec

DEC: -16° 34' 52''

proper motion (J2000)

RA: 0.263 arcsec/a

DEC: -0.297 arcsec/a

radial velocity

-6 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

87 km/s (uncertain) (variable)

trigonometric parallax

0.087 arcsec

galactic coordinates

longitude: 37.6°

latitude: -46.01°

magnitude

visual magnitude

2.87
(V on UBV Johnson system)

spectral / color information

spectral class

Am

B-V-magnitude

0.29

U-B-magnitude

0.09

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

Delta Sct spectrum. Also classified Delta Del, A7mIII.

variability information

variable star identification

Del Cap

 

note (category: variability):

EA (possibly RS CVn type) 2.83 - 3.05V, 1.0227789d. Form of light curve varies.

double/multiple star system information

number of components of multiple star system

4

separation

0 arcsec

mag difference (of double or brightest multiple)

2

 

note (category: double and multiple data):

ADS 15314A. Component A is SB, 3.2, 5.2v, 0.0018"; B, 15.8v, 69"; C 12.7v, 120".

 

note (category: spectroscopic binaries):

1.0228d, K 70.8k/s, V0 -0.2k/s, asini 0.996.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) e Aur

note (category: star names):

Al Anz; Almaaz.

position, motion, parallax:

position (J2000)

RA: 5h 1min 58.1sec

DEC: +43° 49' 24''

position (2000.73)

RA: 5h 2min 1sec

DEC: +43° 49' 28''

position (B1900)

RA: 4h 54min 47.4sec

DEC: +43° 40' 32''

proper motion (J2000)

RA: -0.001 arcsec/a

DEC: -0.004 arcsec/a

radial velocity

-3 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible

rotational velocity

29 km/s (uncertain) (variable)

trigonometric parallax

0.007 arcsec

galactic coordinates

longitude: 162.79°

latitude: 1.18°

magnitude

visual magnitude

2.99
(V on UBV Johnson system)

spectral / color information

spectral class

F0Iae+B

B-V-magnitude

0.54

U-B-magnitude

0.33

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

Shell star. Also classified A8Ia-F2epIa + B.

variability information

variable star identification

Eps Aur

 

note (category: variability):

ADS 3605A, EA 2.94 - 3.83V, 9892d. Spectrum var. even outside eclipse. RV and light fluctuations about 110d.

double/multiple star system information

number of components of multiple star system

6

separation

207.6 arcsec

mag difference (of double or brightest multiple)

6.2

component ID

AE

 

note (category: double and multiple data):

ADS 3605A. A* 2.98 var. A8Iap. Five visual and one astrometric components. AB visual binary, B, 14v at 29"; C, 11.26V, +1.83(B-V), +1.31(U-B), at 43"; D, 12.0v at 46".

 

note (category: spectroscopic binaries):

ADS 3605A, 9890d, K 15.0k/s, V0 -1.4k/s, msin3i 16.8, asini 2000. Unresolved by speckle interferometry.

 

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) n Ori

position, motion, parallax:

position (J2000)

RA: 6h 7min 34.3sec

DEC: +14° 46' 6''

position (2000.73)

RA: 6h 7min 36sec

DEC: +14° 46' 6''

position (B1900)

RA: 6h 1min 51.7sec

DEC: +14° 46' 50''

proper motion (J2000)

RA: 0.006 arcsec/a

DEC: -0.021 arcsec/a

radial velocity

24 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible

rotational velocity

41 km/s (uncertain) (variable)

trigonometric parallax

-0.032 arcsec

galactic coordinates

longitude: 194.81°

latitude: -2.72°

magnitude

visual magnitude

4.42
(V on UBV Johnson system)

spectral / color information

spectral class

B3V

B-V-magnitude

-0.17

U-B-magnitude

-0.66

R-I-magnitude

 

double/multiple star system information

note (category: spectroscopic binaries):

131.211d, K 33.3k/s, V0 +24.1k/s, asini 46.2.

miscellaneous information

note (category: group membership):

Cas-Tau OB1; member of Pleiades group.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) l Tau

position, motion, parallax:

position (J2000)

RA: 4h 0min 40.8sec

DEC: +12° 29' 25''

position (2000.73)

RA: 4h 0min 43sec

DEC: +12° 29' 32''

position (B1900)

RA: 3h 55min 8.3sec

DEC: +12° 12' 28''

proper motion (J2000)

RA: -0.006 arcsec/a

DEC: -0.012 arcsec/a

radial velocity

18 km/s
note: spectroscopic binaries, double lined spectra
note: orbital data avaible

rotational velocity

87 km/s (uncertain) (variable)

trigonometric parallax

0.002 arcsec

galactic coordinates

longitude: 178.37°

latitude: -29.38°

 

note (category: dynamical parallaxes):

0.0042".

magnitude

visual magnitude

3.47
(V on UBV Johnson system)

spectral / color information

spectral class

B3V+A4IV

B-V-magnitude

-0.12

U-B-magnitude

-0.62

R-I-magnitude

 

IR-note

object is infrared source (Engels et al., 1982)

variability information

variable star identification

Lam Tau

 

note (category: variability):

EA 3.3 - 3.80p, B3V+A, 3.952955d, i 86d.

double/multiple star system information

note (category: spectroscopic binaries):

3.9540d, K 55.4k/s, V0 +15.2k/s, asini 2.99. RV also varies in 33.025d, triple system. Masses 6.8, 1.8 and about 1 solar.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) g Per

position, motion, parallax:

position (J2000)

RA: 3h 4min 47.8sec

DEC: +53° 30' 23''

position (2000.73)

RA: 3h 4min 51sec

DEC: +53° 30' 33''

position (B1900)

RA: 2h 57min 32.9sec

DEC: +53° 6' 54''

proper motion (J2000)

RA: 0 arcsec/a

DEC: -0.005 arcsec/a

radial velocity

3 km/s
note: spectroscopic binaries, double lined spectra
note: orbital data avaible

rotational velocity

=<50 km/s (uncertain) (variable)

trigonometric parallax

0.016 arcsec

galactic coordinates

longitude: 142.07°

latitude: -4.34°

magnitude

visual magnitude

2.93
(V on UBV Johnson system)

spectral / color information

spectral class

G8III+A2V

B-V-magnitude

0.7

U-B-magnitude

0.45

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

double/multiple star system information

number of components of multiple star system

3

separation

57 arcsec

mag difference (of double or brightest multiple)

8.6

component ID

AB

 

note (category: double and multiple data):

SKYLAB observations indicate cool star with hot companion. Components Aa, 14.65y, a = 0.159". Physical nature of B, 11m at 57", uncertain.

 

note (category: spectroscopic binaries):

5350d, K 12.7 or 21.9k/s, V0 +2.5k/s, msin3i 4.87, asini 648. vsini of secondary 50k/s. Resolved by speckle interferometry 1981.67, sep. 0.284", 1983.93, sep. 0.27".

miscellaneous information

note (category: miscellaneous):

Close to error box of X-ray source 3U0305+53.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) z Aur

note (category: star names):

Haedi; Haedus; Hoedus I. With HR 1641, one of the "kids"; Sadatoni; Saclateni.

position, motion, parallax:

position (J2000)

RA: 5h 2min 28.7sec

DEC: +41° 4' 33''

position (2000.73)

RA: 5h 2min 32sec

DEC: +41° 4' 37''

position (B1900)

RA: 4h 55min 29.1sec

DEC: +40° 55' 48''

proper motion (J2000)

RA: 0.009 arcsec/a

DEC: -0.022 arcsec/a

radial velocity

13 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

19 km/s

trigonometric parallax

0.005 arcsec

galactic coordinates

longitude: 165.02°

latitude: -0.43°

magnitude

visual magnitude

3.75
(V on UBV Johnson system)

spectral / color information

spectral class

K4II+B8V

B-V-magnitude

1.22

U-B-magnitude

0.38

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

Also classified K5II + B5V.

variability information

variable star identification

Zet Aur

 

note (category: variability):

EA 3.70 - 3.97V, 972.164d, i 90d. Variable duration of min. Amp. depends on wavelength, 0.55B, 1.97U. K component amp. 0.05V.

double/multiple star system information

note (category: spectroscopic binaries):

972.162d, K 24.6k/s, V0 +12.9k/s, msin3i 7.54, asini 300. Unresolved by speckle interferometry . SKYLAB indicates cool star with hot companion.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) V0695 Cyg

note (category: star names):

See HR 7730.

position, motion, parallax:

position (J2000)

RA: 20h 13min 37.9sec

DEC: +46° 44' 29''

position (2000.73)

RA: 20h 13min 39sec

DEC: +46° 44' 37''

position (B1900)

RA: 20h 10min 28.9sec

DEC: +46° 26' 16''

proper motion (J2000)

RA: 0.004 arcsec/a

DEC: 0.003 arcsec/a

radial velocity

-8 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

=<25 km/s (uncertain) (variable)

trigonometric parallax

0.007 arcsec

galactic coordinates

longitude: 82.68°

latitude: 6.78°

magnitude

visual magnitude

3.79
(V on UBV Johnson system)

spectral / color information

spectral class

K2II+B3V

B-V-magnitude

1.28

U-B-magnitude

0.42

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

Also classified K4Iab + B4IV-V.

variability information

variable star identification

V695 Cyg

 

note (category: variability):

ADS 13554A, EA 3.77 - 3.88V, 3784.3d. Amp. varies strongly with wavelength. C = NSV 12931, 6.98V.

double/multiple star system information

number of components of multiple star system

6

separation

337.5 arcsec

mag difference (of double or brightest multiple)

1

component ID

AD

 

note (category: double and multiple data):

Component C, 6.99V, -0.14(B-V), -0.58(U-B) B5V, vsini : 25k/s, at 107" fixed. AP probably single star.

 

note (category: spectroscopic binaries):

ADS 13554A, 3784.3d, K 14.0k/s, V0 -7.7k/s, msin3i 9.19, asini 711. Unresolved by speckle interferometry. SKYLAB indicates cool star with hot companion. vsini of secondary 80k/s.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) m Sgr

position, motion, parallax:

position (J2000)

RA: 18h 13min 45.8sec

DEC: -21° 3' 32''

position (2000.73)

RA: 18h 13min 49sec

DEC: -21° 3' 31''

position (B1900)

RA: 18h 7min 46.9sec

DEC: -21° 5' 6''

proper motion (J2000)

RA: 0.002 arcsec/a

DEC: 0.001 arcsec/a

radial velocity

-6 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

=<54 km/s (uncertain) (variable)

trigonometric parallax

0.012 arcsec

galactic coordinates

longitude: 10°

latitude: -1.6°

magnitude

visual magnitude

3.86
(V on UBV Johnson system)

spectral / color information

spectral class

B8Iap

B-V-magnitude

0.23

U-B-magnitude

-0.49

R-I-magnitude

 

 

note (category: spectra):

Shell star.

variability information

variable star identification

Mu Sgr

 

note (category: variability):

ADS 11169A, EA 3.79 - 3.92V, 180.45d. Also irregular changes in brightness.

double/multiple star system information

number of components of multiple star system

6

separation

0 arcsec

mag difference (of double or brightest multiple)

2.9

 

note (category: double and multiple data):

ADS 11169A is SB, 4.1, 7.0v, sep. 0.011". Closest visual companion is B, 11.5v, B9III at 17"; C is 13.5v at 26"; D, 9.9v, B3; E, 9.4v, B2V, physical, vsini 184k/s.

 

note (category: spectroscopic binaries):

ADS 11169A, 180.45d, K 56.8k/s, V0 -2.7k/s, asini 129.

miscellaneous information

note (category: group membership):

Sgr OB1.

 

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) V1488 Cyg

note (category: star names):

Originally called Omicron2 Cyg in GCVS, the name has been changed to V1488 Cyg because of much confusion as to which star is Omicron1, which Omicron2. See HR 7730.

position, motion, parallax:

position (J2000)

RA: 20h 15min 28.3sec

DEC: +47° 42' 52''

position (2000.73)

RA: 20h 15min 29sec

DEC: +47° 43' 0''

position (B1900)

RA: 20h 12min 22.8sec

DEC: +47° 24' 25''

proper motion (J2000)

RA: 0.001 arcsec/a

DEC: 0.008 arcsec/a

radial velocity

-14 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

<25 km/s (uncertain) (variable)

trigonometric parallax

0.014 arcsec

galactic coordinates

longitude: 83.67°

latitude: 7.05°

magnitude

visual magnitude

3.98
(V on UBV Johnson system)

spectral / color information

spectral class

K3Ib+B3V

B-V-magnitude

1.52

U-B-magnitude

1.03

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

Also classified K5Iab + B4IV-V and K3II + B9:V.

variability information

variable star identification

V1488 Cyg

 

note (category: variability):

EA 3.90 - 4.14V, 1147.4d. Period varies. Light var. outside eclipse. The K component may be slightly intrinsically variable.

double/multiple star system information

separation

208.9 arcsec

mag difference (of double or brightest multiple)

5.5

note

Worley (1978) update of the IDS

 

note (category: spectroscopic binaries):

1147.8d, K 17.0k/s, V0 -5.7k/s, msin3i 9.15, asini 256. Also 390d suspected. Unresolved by speckle interferometry. SKYLAB indicates cool star with hot companion.

 

 

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) t Per

position, motion, parallax:

position (J2000)

RA: 2h 54min 15.5sec

DEC: +52° 45' 45''

position (2000.73)

RA: 2h 54min 19sec

DEC: +52° 45' 56''

position (B1900)

RA: 2h 47min 9.8sec

DEC: +52° 21' 12''

proper motion (J2000)

RA: 0 arcsec/a

DEC: -0.005 arcsec/a

radial velocity

2 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible

rotational velocity

<25 km/s (uncertain) (variable)

trigonometric parallax

0.019 arcsec

galactic coordinates

longitude: 141.02°

latitude: -5.74°

magnitude

visual magnitude

3.95
(V on UBV Johnson system)

spectral / color information

spectral class

G4III+A4V

B-V-magnitude

0.74

U-B-magnitude

0.46

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

Tau Per

 

note (category: variability):

EA, 3.94 - 4.07V.

double/multiple star system information

number of components of multiple star system

4

separation

51.7 arcsec

mag difference (of double or brightest multiple)

8.6

component ID

AxBC

 

note (category: double and multiple data):

A* 4.06 G4III+A4V, 4.150y, a = 0.050". Speckle interferometric sep. 0.080" 1981.67. Circumstellar material surrounding the pair? Visual companions 10.7v at 51" possibly physical; 11.8v at 4" possibly optical.

 

note (category: spectroscopic binaries):

ADS 2202A, 1515.6d, K 19.0k/s, V0 +2.2k/s, asini 271. vsini of secondary 50k/s.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) e UMi

position, motion, parallax:

position (J2000)

RA: 16h 45min 58.1sec

DEC: +82° 2' 14''

position (2000.73)

RA: 16h 45min 54sec

DEC: +82° 2' 9''

position (B1900)

RA: 16h 56min 12.2sec

DEC: +82° 12' 8''

proper motion (J2000)

RA: 0.017 arcsec/a

DEC: 0.006 arcsec/a

radial velocity

-11 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible

rotational velocity

23 km/s (uncertain) (variable)

trigonometric parallax

0.01 arcsec

galactic coordinates

longitude: 115°

latitude: 31.05°

magnitude

visual magnitude

4.23
(V on UBV Johnson system)

spectral / color information

spectral class

G5III

B-V-magnitude

0.89

U-B-magnitude

0.55

R-I-magnitude

 

variability information

variable star identification

Eps UMi

 

note (category: variability):

EA 4.22 - 4.28V, 39.4809d.

double/multiple star system information

separation

76.9 arcsec

mag difference (of double or brightest multiple)

8.3

 

note (category: spectroscopic binaries):

39.4809d, K 31.8k/s, V0 -10.6k/s, asini 17.3.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) VV Cep

position, motion, parallax:

position (J2000)

RA: 21h 56min 39.1sec

DEC: +63° 37' 32''

position (2000.73)

RA: 21h 56min 40sec

DEC: +63° 37' 45''

position (B1900)

RA: 21h 53min 49.9sec

DEC: +63° 8' 57''

proper motion (J2000)

RA: -0.005 arcsec/a

DEC: -0.004 arcsec/a

radial velocity

-19 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

0 km/s

trigonometric parallax

0.004 arcsec

galactic coordinates

longitude: 104.92°

latitude: 7.05°

magnitude

visual magnitude

4.91
(V on UBV Johnson system)

 

spectral / color information

spectral class

M2Iaep+B8Ve

B-V-magnitude

1.77

U-B-magnitude

0.39

R-I-magnitude

 

IR-note

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

 

note (category: spectra):

Companion variously classified B9, B8Ve, and B6II.

variability information

variable star identification

VV Cep

 

note (category: variability):

EA 4.80 - 5.36V, 6.65 - 7.46p, 7430d. Also slow oscillations, amp. 0.15, per. 13.7y and amp. 0.03, per. 349d. Red observations indicate Sr amp. 0.4m, 58d. H alpha varies in 118.37d, period stable over 20y interval. This is probably the pulsation period of the red component. Amplitude varies in period 825d or more. The blue companion may be intrinsically variable. VV Cep also magnetic variable.

double/multiple star system information

separation

0.1 arcsec

mag difference (of double or brightest multiple)

1.7

note

Worley (1978) update of the IDS

 

note (category: double and multiple data):

A* var. M2Iab, B6IIe. Combined mag., colors. Absolute magnitudes based on astrometric and spectroscopic data are -4.0V for red component, -2.3 for the blue.

 

note (category: spectroscopic binaries):

7430.5d, K 19.4k/s, V0 -20.2k/s, msin3i 18.0, asini 1860. The SB secondary is probably also the visual companion. Mass transfer from red star to the hot companion. SB unresolved by speckle interferometry at 4-meter Mayall telescope in 1975-6.

miscellaneous information

note (category: group membership):

Cep OB2.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) AR Cas

position, motion, parallax:

position (J2000)

RA: 23h 30min 2sec

DEC: +58° 32' 56''

position (2000.73)

RA: 23h 30min 4sec

DEC: +58° 33' 10''

position (B1900)

RA: 23h 25min 24.6sec

DEC: +57° 59' 51''

proper motion (J2000)

RA: 0.02 arcsec/a

DEC: 0.005 arcsec/a

radial velocity

-13 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible

rotational velocity

144 km/s (uncertain) (variable)

dynamical parallax

0.006 arcsec

galactic coordinates

longitude: 112.47°

latitude: -2.66°

 

note (category: dynamical parallaxes):

0.003" for components CD.

magnitude

visual magnitude

4.91
(V on UBV Johnson system)

spectral / color information

spectral class

B3IV

B-V-magnitude

-0.12

U-B-magnitude

-0.64

R-I-magnitude

 

variability information

variable star identification

AR Cas

 

note (category: variability):

ADS 16795A, EA 4.84 - 4.98V, 6.0663309d; i 90d.

double/multiple star system information

number of components of multiple star system

8

separation

75.7 arcsec

mag difference (of double or brightest multiple)

2.3

component ID

AC

 

note (category: double and multiple data):

AB, 4.9, 9.3V, 1500y, sep. 1.1". CD, 8.2 A0Vn, 9.8v, sep. 1.6"; vsini of C, 210k/s. Component E, optical.

 

note (category: spectroscopic binaries):

ADS 16795A, 6.0663d, K 56.7k/s, V0 -13.4k/s, asini 4.58. Alternate orbits 6.0663309d, K 54.18k/s, V0 -10.10k/s, asini 4.44; 6.0668d, K 56.2k/s, V0 -11.0k/s, asini 4.6027. Apsidal period 1500 1800y.

miscellaneous information

note (category: group membership):

Cas-Tau OB1.

 

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991) d Lib

note (category: star names):

Zuben Elakribi.

position, motion, parallax:

position (J2000)

RA: 15h 0min 58.4sec

DEC: -8° 31' 8''

position (2000.73)

RA: 15h 1min 0sec

DEC: -8° 31' 18''

position (B1900)

RA: 14h 55min 37.7sec

DEC: -8° 7' 20''

proper motion (J2000)

RA: -0.063 arcsec/a

DEC: -0.005 arcsec/a

radial velocity

-39 km/s
note: spectroscopic binaries
note: orbital data avaible

rotational velocity

77 km/s (uncertain) (variable)

trigonometric parallax

0.02 arcsec

galactic coordinates

longitude: 348.87°

latitude: 42.51°

magnitude

visual magnitude

4.92
(V on UBV Johnson system)

spectral / color information

spectral class

B9.5V

B-V-magnitude

0

U-B-magnitude

-0.1

R-I-magnitude

 

variability information

variable star identification

Del Lib

 

note (category: variability):

EA 4.92 - 5.90V, 2.32735297d, period may vary. Component A of quadruple system. Contact binary.

double/multiple star system information

number of components of multiple star system

4

separation

106.3 arcsec

mag difference (of double or brightest multiple)

6.4

component ID

AC

note

Worley (1978) update of the IDS

 

note (category: spectroscopic binaries):

2.3273d, K 78.3k/s, V0 -36.4k/s, asini 2.50. Orbital period variable. Masses 2.6, 1.1 solar.

Un ejemplo: Estudio de HD193986

HD 193986 is an Algol-type Eclipsing Binary Star

Vidal-Sainz, Joaquin

Grup d'Estudis Astronomics, Apartado 9481, 08080 Barcelona, Spain, e-mail: jvidal@astrogea.org

SIMBAD object(s):    HD 193986 = BD +30 4003


Name of the object:  HD 193986 = BD +30°4003 = HIP 100443 = SAO 69906 = PPM 84803 = GSC 02672-00976 = ADS 13760 AB

Equatorial coordinates:  R.A.=  20h22m10s.19  DEC.=  +31°15'11".5  Equinox:  2000.0

Observatory and telescope:  Monegrillo Observatory, 41-cm Newtonian telescope

Detector:  CCD

Filter(s):  V

 

Comparison star(s):  HD 332218 = GSC 2672-0986

Check star(s):  1: GSC 2672-1930
& 2: GSC 2672-1406

Transformed to a standard system:  No

Availability of the data:  Upon request

Type of variability:   EA

Remarks:   HD 193986, an object with a V magnitude of 8.63 and an A0 spectral type, is a variable discovered by the Hipparcos mission (ESA, 1997) after detecting light variations between 8m.64 and 8m.76. It could not be assigned a variable type and was catalogued as an unsolved variable. HD 193986 is also a double star (ADS 13760 AB, Aitken, 1932) whose components, of magnitudes 9.7 and 9.9, are 0".3 apart.
The analysis of the Hipparcos satellite data indicated that this star might be an Algol-type eclipsing binary star with a period of 1d.3955 or double. To confirm the analysis results this star was observed for 27 nights, between July 9, 2000 and November 9, 2000. Photometric observations showed that HD 193986 is in fact an EA variable with a period of 2d.79. The star fades 0m.10 at primary minimum and 0m.03 at the secondary one. Since it could only be performed joint photometry of the optical binary system, brightness variations must have a larger amplitude for the variable component.
The following ephemeris could also be computed:

Min I = HJD 2451809.4772

+ 2d.791185

×E.

±0.0006

±0.000010

 

Acknowledgements:  I am grateful to J. M. Gomez-Forrellad for his analysis of the Hipparcos data, which allowed to solve this variable.



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