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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)