AB Andromedae

AB Andromedae

The visual band light curve of AB Andromedae, adapted from Parimucha et al.[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 11m 32.08609s[2]
Declination +36° 53′ 35.10721″[2]
Apparent magnitude (V) 9.49 ( – 10.32) – 10.46[3]
Characteristics
Spectral type G5+G5V[3]
Apparent magnitude (B) 10.62[4]
Apparent magnitude (V) 9.675[4]
Apparent magnitude (G) 9.6953[2]
Apparent magnitude (J) 8.172[5]
Apparent magnitude (H) 7.805[5]
Apparent magnitude (K) 7.665[5]
B−V color index 0.9163[4]
Variable type EW
Astrometry
Radial velocity (Rv)−27.53±0.67[6] km/s
Proper motion (μ) RA: 107.923±0.046 [2] mas/yr
Dec.: −53.357±0.036[2] mas/yr
Parallax (π)11.7027 ± 0.0367 mas[2]
Distance278.7 ± 0.9 ly
(85.5 ± 0.3 pc)
Orbit[7]
Period (P)0.3319 days
Semi-major axis (a)2.308 R☉[8]
Eccentricity (e)0.002±0.001
Argument of periastron (ω)
(secondary)		40±5°
Argument of periastron (ω)
(primary)		220±5°
Semi-amplitude (K1)
(primary)		233±1 km/s
Semi-amplitude (K2)
(secondary)		133±1 km/s
Details[9]
Primary
Mass1.04 M☉
Radius1.03 R☉
Surface gravity (log g)4.392[10] cgs
Temperature5,798 K
Age5.53±2.00[8] Gyr
Secondary
Mass0.60 M☉
Radius0.78 R☉
Surface gravity (log g)4.347[10] cgs
Temperature5,450 K
Age5.53±2.00[8] Gyr
Other designations
2MASS J23113209+3653351, BD+36 5017, HIP 114508, SAO 73069, TYC 2763-904-1
Database references
SIMBADdata

AB Andromedae (AB And) is a binary star in the constellation Andromeda. Paul Guthnick and Richard Prager discovered that the star is an eclipsing binary in 1927.[11][12] Its maximum apparent visual magnitude is 9.49 but shows a variation in brightness down to a magnitude of 10.46 in a periodic cycle of roughly 8 hours. The observed variability is typical of W Ursae Majoris variable stars,[3] so the two stars in this system form a contact binary.

  1. ^ Cite error: The named reference Parimucha was invoked but never defined (see the help page).
  2. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ a b c Cite error: The named reference GCVS was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference TYCHO was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference 2MASS Cat was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Karami2009 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference mnras_1_437 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Borkovits2005 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Liu2018 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Oosterhoff1929 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Guthnick1927 was invoked but never defined (see the help page).