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
editThr 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]
Companion
editV529 Andromedae has a 13th magnitude companion about 15″ away.[10] It is a far more distant star than V529 Andromedae, only coincidentally aligned in the sky.[11]
References
edit- ^ a b c d e f g h 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.
- ^ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; van Leeuwen, F.; van der Marel, H.; Mignard, F.; Murray, C. A.; Le Poole, R. S.; Schrijver, H.; Turon, C.; Arenou, F.; Froeschlé, M.; Petersen, C. S. (July 1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P. Retrieved 10 November 2024.
- ^ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2011). "The 80th Name-List of Variable Stars. Part I - RA 0h to 6h" (PDF). Information Bulletin on Variable Stars. 5969. Bibcode:2011IBVS.5969....1K. Retrieved 10 November 2024.
- ^ 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.