65 Andromedae

65 Andromedae, abbreviated 65 And, is a single,[10] orange-hued star in the northern constellation of Andromeda. With an apparent magnitude of 4.73,[2] it is visible to the naked eye. The distance to 65 And can be derived from its annual parallax shift of 7.5 mas,[1] which yields a range of around 440 light years. At that distance, its brightness is relatively lowered primarily by the inverse square law but also by an extinction of 0.16 magnitude due to interstellar dust.[11] The star is moving closer to the Earth with a heliocentric radial velocity of −5 km/s.[5]

65 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 02h 25m 37.42608s[1]
Declination +50° 16′ 43.0815″[1]
Apparent magnitude (V) 4.734[2]
Characteristics
Evolutionary stage giant
Spectral type K4.5 III[3]
B−V color index 1.532±0.009[4]
Astrometry
Radial velocity (Rv)−4.93±0.20[5] km/s
Proper motion (μ) RA: +22.399[1] mas/yr
Dec.: −15.628[1] mas/yr
Parallax (π)7.4603 ± 0.2285 mas[1]
Distance440 ± 10 ly
(134 ± 4 pc)
Absolute magnitude (MV)−1.10[6]
Details
Mass1.63[7] M☉
Radius47[8] R☉
Luminosity372[7] L☉
Surface gravity (log g)1.650[2] cgs
Temperature3,927±24[7] K
Metallicity [Fe/H]−0.210[2] dex
Age3.01[7] Gyr
Other designations
65 And, BD+49° 656, FK5 2165, HD 14872, HIP 11313, HR 699, SAO 23319, WDS J02256+5017A[9]
Database references
SIMBADdata

This is a mildly iron-deficient[12] giant star with a stellar classification of K4.5 III,[3] which indicates that, at the age of three billion years,[7] is an evolved star that has exhausted the hydrogen at its core and expanded its radius. The measured angular diameter of this star, after correction for limb darkening, is 3.28±0.06 mas.[13] At the estimated distance of this star, this yields a physical size of about 47 times the radius of the Sun.[8] The star has 1.6[7] times the mass of the Sun and is radiating 372[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,927 K.[7]

References
  1. 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.
  2. Soubiran, Caroline; et al. (2016), "The PASTEL catalogue: 2016 version", Astronomy & Astrophysics, 591: A118, arXiv:1605.07384, Bibcode:2016A&A...591A.118S, doi:10.1051/0004-6361/201628497, S2CID 119258214.
  3. Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. 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.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. Luck, R. E.; Heiter, U. (June 2007), "Giants in the Local Region", Astronomy & Astrophysics, 133 (6): 2464–2486, Bibcode:2007AJ....133.2464L, doi:10.1086/513194.
  7. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  8. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  9. "65 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 6, 2018.
  10. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  11. Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
  12. Krempec-Krygier, J.; et al. (October 1991), "The chemical composition of two K4-type giants, HD 14872 and HD 209960", Astronomy and Astrophysics, 250 (2): 451−458, Bibcode:1991A&A...250..451K.
  13. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
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