39 Andromedae

39 Andromedae, abbreviated 39 And, is a double star in the northern constellation Andromeda. 39 Andromedae is the Flamsteed designation. Its apparent visual magnitude is 5.95,[2] which indicates it is near the lower limit on visibility to the naked eye. The distance to this star, as estimated from its annual parallax shift of 9.57 mas,[1] is 341 light years. It is a suspected member of the Ursa Major Moving Group, although King et al. (2003) list it as a probable non-member.[8]

39 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 01h 02m 54.25356s[1]
Declination +41° 20′ 42.7673″[1]
Apparent magnitude (V) 5.95[2]
Characteristics
Spectral type kA3hA7VmA9[3]
B−V color index +0.161±0.009[2]
Astrometry
Radial velocity (Rv)+3.1±0.9[4] km/s
Proper motion (μ) RA: −17.558[1] mas/yr
Dec.: −18.400[1] mas/yr
Parallax (π)9.5725 ± 0.0805[1] mas
Distance341 ± 3 ly
(104.5 ± 0.9 pc)
Absolute magnitude (MV)0.80[2]
Details
Radius1.2[5] R☉
Luminosity39.95[2] L☉
Surface gravity (log g)3.93[6] cgs
Temperature8,073[6] K
Metallicity [Fe/H]+0.13[6] dex
Rotational velocity (v sin i)34[6] km/s
Other designations
39 And, BD+40° 209, HD 6116, HIP 4903, HR 290, SAO 36874, WDS J01029+4121A[7]
Database references
SIMBADdata

The brighter component is a confirmed Am star[9] with a stellar classification of kA3hA7VmA9.[3] This notation indicates its spectrum displays the calcium K line of an A3 star, the hydrogen lines of an A7 V, or A-type main-sequence star, and the metal lines of an A9 star. It is radiating 40[2] times the Sun's luminosity from its photosphere at an effective temperature of 8,073 K.[6] As of 2015, the magnitude 12.48 companion star is located at an angular separation of 20.5″ along a position angle of 3° from the primary.[10]

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. 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.
  3. Levato, H.; Abt, H. A. (August 1978), "Spectral types in the Ursa Major stream", Publications of the Astronomical Society of the Pacific, 90: 429−433, Bibcode:1978PASP...90..429L, doi:10.1086/130352.
  4. 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.
  5. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  6. Monier, R. (November 2005), "Abundances of a sample of A and F-type dwarf members of the Ursa Major Group", Astronomy and Astrophysics, 442 (2): 563–566, Bibcode:2005A&A...442..563M, doi:10.1051/0004-6361:20053222.
  7. "39 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 28, 2018.
  8. King, Jeremy R.; et al. (2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group", The Astronomical Journal, 125 (4): 1980, Bibcode:2003AJ....125.1980K, doi:10.1086/368241.
  9. Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.
  10. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
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