Astronomy:V529 Andromedae

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Short description: Star in the constellation Andromeda
V529 Andromedae
V529AndLightCurve.png
Blue band light curves for V529 Andromedae, adapted from Henry and Fekel (2005)[1]
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
Distance173.8 ± 0.3 ly
(53.30 ± 0.08 pc)
Absolute magnitude (MV)+2.68[1]
Details
Mass1.55±0.1[1] M☉
Radius1.7±0.1[1] R☉
Luminosity6.5±0.6[1] L☉
Surface gravity (log g)4.1±0.2[5] cgs
Temperature7560±180[5] K
Metallicity+0.11[6]
Rotational velocity (v sin i)53.1±0.5[5] km/s
Age727[2] Myr
Other designations
HD 8801, HIP 6794, SAO 37227, PPM 44004, HR 418, HD 8801, BD+40°289
Database references
SIMBADdata

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.[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]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 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. doi:10.1086/428373. Bibcode: 2005AJ....129.2026H. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Mendoza, E. E. et al. (1978). "UBVRI photometry of 225 AM stars". The Astronomical Journal 83: 606–614. doi:10.1086/112242. Bibcode: 1978AJ.....83..606M. 
  4. ↑ 4.0 4.1 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. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A. 
  5. ↑ 5.0 5.1 5.2 5.3 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. doi:10.1002/asna.201311909. Bibcode: 2013AN....334..638N. 
  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. doi:10.1093/mnras/sty1912. Bibcode: 2018MNRAS.480.2953G. 
  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. doi:10.1111/j.1365-2966.2009.15005.x. Bibcode: 2009MNRAS.398.1339H. 
  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. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 
  9. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.



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