65 Andromedae

65 Andromedae, abbreviated 65 And, is a single,[10] orange-hued star in the northern constellation of Andromeda. With an apparent magnitude is 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 diminished 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[1] mas
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.
  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.
  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, 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.
  8. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 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.
  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.
  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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