V529 Andromedae
Star in the constellation Andromeda
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V529 Andromedae, also known as HD 8801, is a variable star in the constellation of Andromeda. It has a 13th magnitude visual companion star 15" away, which is just a distant star on the same line of sight.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 27m 26.6729s[2] |
| Declination | +41° 06′ 04.178″[2] |
| Apparent magnitude (V) | 6.46[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | Am(kA5/hF1/mF2)[4] |
| U−B color index | 0.03[3] |
| B−V color index | 0.27[3] |
| V−R color index | 0.26[3] |
| R−I color index | 0.16[3] |
| Variable type | γ Doradus and δ Scuti[5] |
| Astrometry | |
| Radial velocity (Rv) | 0.8±0.3[1] km/s |
| Proper motion (μ) | RA: 9.611±0.030[2] mas/yr Dec.: 25.910±0.024[2] mas/yr |
| Parallax (π) | 18.7624±0.0298 mas[2] |
| Distance | 173.8 ± 0.3 ly (53.30 ± 0.08 pc) |
| Absolute magnitude (MV) | +2.68[1] |
| Details | |
| Mass | 1.55±0.1[1] M☉ |
| Radius | 1.7±0.1[1] R☉ |
| Luminosity | 6.5±0.6[1] L☉ |
| Surface gravity (log g) | 4.1±0.2[5] cgs |
| Temperature | 7560±180[5] K |
| Metallicity | +0.11[6] |
| Rotational velocity (v sin i) | 53.1±0.5[5] km/s |
| Age | 727[2] Myr |
| Other designations | |
| HD 8801, HIP 6794, SAO 37227, PPM 44004, HR 418, HD 8801, BD+40°289 | |
| Database references | |
| SIMBAD | data |
It is also an Am star with a spectral classification Am(kA5/hF1/mF2), meaning that it has the calcium K line of a star with spectral type A5, the Balmer series of a F1 star, and metallic lines of an F2 star.[4]
Variability
The variable brightness of V529 Andromedae was first detected in the Hipparcos satellite data. It was classified as an "unsolved variable" (meaning it could not be placed into any specific variable star category) in the Hipparcos catalog released in 1997.[7] The star's variability was confirmed in a study published by Gregory W. Henry and Francis C. Fekel in 2005,[1] and the star was given its variable star designation in 2011.[8]
V529 Andromedae was the first star known to combine Gamma Doradus and Delta Scuti type pulsations.[1] Nine different pulsation frequencies have been observed, and three of them could arise from a previously unknown stellar pulsation mode.[9]