variables of Algol type
(brighter mag
|
Name |
max. magnitude |
min. magnitude |
period |
MK spectral
class |
|
1.89 |
1.98 |
3.960042 |
A2IV+A2IV-V |
|
|
2.12 |
3.39 |
2.867304 |
B8V |
|
|
2.14 |
2.26 |
5.732476 |
O9.5II-III+B0III |
|
|
2.21 |
2.32 |
17.35991 |
A0V+G5V |
|
|
2.68 |
2.76 |
759 |
A5V |
|
|
2.81 |
3.05 |
1.022769 |
A7mIII |
|
|
2.92 |
3.83 |
9892 |
A8Ia-F2epIa+BV |
|
|
3.31 |
3.6 |
7.989268 |
B0.5Vea+B3V |
|
|
3.37 |
3.91 |
3.952948 |
B3V+A4IV |
|
|
3.63 |
4.18 |
|
|
|
|
3.7 |
0.55* |
972.16 |
K5II+B7V |
|
|
3.73 |
3.89 |
3784.3 |
K4Iab+B4IV-V |
|
|
3.8 |
3.88 |
180.55 |
B8eqIa+B1.5V |
|
|
3.9 |
4.14 |
1147.4 |
K5Iab+B4IV-V |
|
|
3.91 |
4.42 |
1.669767 |
B6V+B9V |
|
|
3.94 |
4.07 |
|
|
|
|
4.19 |
4.23 |
39.4809 |
G5III |
|
|
4.39 |
0.06* |
|
|
|
|
4.8 |
5.36 |
7430 |
M2epIa-Iab+B8:eV |
|
|
4.82 |
4.96 |
6.066331 |
B3IV-V |
|
|
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 |
|
|
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 |
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 |
|
|
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 |
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 |
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 |
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 |
|
|
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 |
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 |
|
|
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 |
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 |
|
|
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 |
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 |
|
|
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 |
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 |
|
|
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 |
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 |
|
|
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 |
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 |
|
|
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 |
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 |
|
|
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 |
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 |
|
|
rotational
velocity |
19
km/s |
|
|
trigonometric
parallax |
0.005
arcsec |
|
|
galactic
coordinates |
longitude:
165.02° |
latitude:
-0.43° |
magnitude
|
visual
magnitude |
3.75 |
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 |
|
|
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 |
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 |
|
|
rotational
velocity |
=<54
km/s (uncertain) (variable) |
|
|
trigonometric
parallax |
0.012
arcsec |
|
|
galactic
coordinates |
longitude:
10° |
latitude:
-1.6° |
magnitude
|
visual
magnitude |
3.86 |
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 |
|
|
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 |
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 |
|
|
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 |
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 |
|
|
rotational
velocity |
23
km/s (uncertain) (variable) |
|
|
trigonometric
parallax |
0.01
arcsec |
|
|
galactic
coordinates |
longitude:
115° |
latitude:
31.05° |
magnitude
|
visual
magnitude |
4.23 |
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 |
|
|
rotational
velocity |
0
km/s |
|
|
trigonometric
parallax |
0.004
arcsec |
|
|
galactic
coordinates |
longitude:
104.92° |
latitude:
7.05° |
magnitude
|
visual
magnitude |
4.91 |
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 |
|
|
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 |
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 |
|
|
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 |
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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