V529 Andromedae

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V529 Andromedae
V529AndLightCurve.png
Blue band light curves for V529 Andromedae, adapted from Henry and Fekel (2005) [1]
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
SAO 37227, HIP 6794, HR 418, HD 8801, BD+40°289
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.

Contents

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

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. [7]

Companion

V529 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]

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<span class="mw-page-title-main">Gamma Doradus variable</span> Type of variable star

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References

  1. 1 2 3 4 5 6 7 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.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 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.
  4. 1 2 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.
  5. 1 2 3 4 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.
  6. ↑ 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.
  7. ↑ 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.
  8. ↑ 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 .
  9. ↑ Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
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