V529 Andromedae
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 01h 27m 26.6726s[1] |
Declination | +41° 06′ 04.1831″[1] |
Apparent magnitude (V) | 6.46[2] |
Characteristics | |
Spectral type | Am(kA5/hF1/mF2)[3] |
U−B color index | 0.03[2] |
B−V color index | 0.27[2] |
V−R color index | 0.26[2] |
R−I color index | 0.16[2] |
Variable type | γ Doradus and δ Scuti[4] |
Astrometry | |
Radial velocity (Rv) | 0.8±0.3[5] km/s |
Proper motion (μ) | RA: 9.820±0.084[1] mas/yr Dec.: 25.568±0.081[1] mas/yr |
Parallax (π) | 18.5729 ± 0.0435 mas[1] |
Distance | 175.6 ± 0.4 ly (53.8 ± 0.1 pc) |
Absolute magnitude (MV) | +2.68[5] |
Details | |
Mass | 1.55±0.1[5] M☉ |
Radius | 1.7±0.1[5] R☉ |
Luminosity | 6.5±0.6[5] L☉ |
Surface gravity (log g) | 4.1±0.2[4] cgs |
Temperature | 7560±180[4] K |
Rotational velocity (v sin i) | 53.1±0.5[4] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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.
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.[3]
Variability
V529 Andromedae was the first star known to combine Gamma Doradus and Delta Scuti type pulsations.[5] Nine different pulsation frequencies have been observed, and three of them could arise from a previously unknown stellar pulsation mode.[6]
Companion
V529 Andromedae has a 13th magnitude companion about 15″ away.[7] It is a far more distant star than V529 And, only coincidentally aligned in the sky.[8]
References
- ^ a b c d e 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.
- ^ 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.
- ^ a b c d e f 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.
- ^ 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.
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: CS1 maint: unflagged free DOI (link) - ^ 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.
- ^ 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.