Astronomy:V529 Andromedae

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Short description: Star in the constellation Andromeda
V529 Andromedae
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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
Evolutionary stage main sequence[2]
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

The 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

V529 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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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. doi:10.1086/428373. Bibcode: 2005AJ....129.2026H. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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. ↑ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F. et al. (July 1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics 323: L49–L52. Bibcode: 1997A&A...323L..49P. https://articles.adsabs.harvard.edu/pdf/1997A%26A...323L..49P. Retrieved 10 November 2024. 
  8. ↑ 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". Information Bulletin on Variable Stars 5969: 1. Bibcode: 2011IBVS.5969....1K. https://ibvs.konkoly.hu/pub/ibvs/5901/5969.pdf. Retrieved 10 November 2024. 
  9. ↑ 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. 
  10. ↑ 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. 
  11. ↑ 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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