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) |
|