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 | |
| 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 | |
| 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
editV529 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.[7]
Companion
editV529 Andromedae has a 13th magnitude companion about 15″ away.[8] It is a far more distant star than V529 Andromedae, only coincidentally aligned in the sky.[9]
References
edit- ^ a b c d e f g Henry, Gregory W.; Fekel, Francis C. (2005). "HD 8801: A Unique Single Am Star with γ Doradus and δ Scuti Pulsations". The Astronomical Journal. 129 (4): 2026–2033. Bibcode:2005AJ....129.2026H. CiteSeerX 10.1.1.145.5743. doi:10.1086/428373. S2CID 16975954.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e Mendoza, E. E.; et al. (1978). "UBVRI photometry of 225 AM stars". The Astronomical Journal. 83: 606–614. Bibcode:1978AJ.....83..606M. doi:10.1086/112242.
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135–172. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- ^ a b c d Neuteufel, R.; et al. (2013). "Abundance analysis of the γ Doradus-δ Scuti hybrid metallic line (Am) star HD 8801". Astronomische Nachrichten. 334 (7): 638–647. arXiv:1307.3497. Bibcode:2013AN....334..638N. doi:10.1002/asna.201311909. S2CID 117570505.
- ^ Ghazaryan, S.; Alecian, G.; Hakobyan, A. A. (2018). "New catalogue of chemically peculiar stars, and statistical analysis". Monthly Notices of the Royal Astronomical Society. 480 (3): 2953–2962. arXiv:1807.06902. Bibcode:2018MNRAS.480.2953G. doi:10.1093/mnras/sty1912. S2CID 119062018.
- ^ Handler, G. (2009). "Confirmation of simultaneous p and g mode excitation in HD 8801 and γ Peg from time-resolved multicolour photometry of six candidate 'hybrid' pulsators". Monthly Notices of the Royal Astronomical Society. 398 (3): 1339–1351. arXiv:0904.4859. Bibcode:2009MNRAS.398.1339H. doi:10.1111/j.1365-2966.2009.15005.x. S2CID 18019973.
- ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.