HD 185351 is a star in the constellation of Cygnus, the swan. With an apparent visual magnitude of 5.17,[1] it is faintly visible to the naked eye on a dark night. Based on parallax measurements, HD 185351 is located at a distance of 134 light years from the Sun.[2] It is drifting closer with a heliocentric radial velocity of −5.4 km/s.[5]

This was the third brightest star in the view field of the Kepler space telescope, with only θ Cyg and CH Cyg being brighter. The resulting data was used to measure asteroseismic oscillations that yielded a mass estimate for HD 185351, after incorporating interferometric and spectroscopic observations.[3] The result is consistent with the value of 1.60 M☉ provided by a refined stellar model.[6] In the past, the star was likely an A-type main-sequence star similar to Procyon. Hence, it is sometimes dubbed a "retired A star".[3]

HD 185351 has a stellar classification of G8.5IIIb Fe−0.5,[4] suggesting this is a late G-type giant star with a mild underabundance of iron compared to similar stars. However, its location on the H-R diagram is more consistent with being a less evolved subgiant star.[3] It has expanded to nearly five times the radius of the Sun and is radiating 14 times the Sun's luminosity.[7] The star has an estimated age of 2.3 billion years[6] and is spinning with a projected rotational velocity of 2 km/s.[8]

As of 2011, searches for planetary companions using Doppler spectroscopy were unsuccessful.[3]

References

  1. ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  2. ^ a b c d e 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.
  3. ^ a b c d e f Johnson, John Asher; et al. (October 2014), "The physical parameters of the retired A star HD 185351", The Astrophysical Journal, 794 (1), id. 15, arXiv:1407.2329, Bibcode:2014ApJ...794...15J, doi:10.1088/0004-637X/794/1/15.
  4. ^ a b Keenan, Philip C.; McNeil, Raymond C (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373, S2CID 123149047.
  5. ^ a b Jönsson, Henrik; et al. (August 17, 2020), "APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South", The Astronomical Journal, 160 (3), American Astronomical Society: 120, arXiv:2007.05537, Bibcode:2020AJ....160..120J, doi:10.3847/1538-3881/aba592, ISSN 0004-6256.
  6. ^ a b c d Hjørringgaard, J. G.; et al. (January 2017), "Testing stellar evolution models with the retired A star HD 185351", Monthly Notices of the Royal Astronomical Society, 464 (3): 3713–3719, arXiv:1610.05990, Bibcode:2017MNRAS.464.3713H, doi:10.1093/mnras/stw2559.
  7. ^ a b c d e f Karovicova, I.; White, T. R.; Nordlander, T.; Casagrande, L.; Ireland, M.; Huber, D. (February 2022), "Fundamental stellar parameters of benchmark stars from CHARA interferometry -- III. Giant and subgiant stars", Astronomy & Astrophysics, 658: A48, arXiv:2109.13258, doi:10.1051/0004-6361/202142100, ISSN 0004-6361.
  8. ^ a b Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931.
  9. ^ "HD 185351", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2025-01-30.
Allikas: https://en.wikipedia.org/wiki/HD_185351
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