60 Andromedae

60 Andromedae (abbreviated 60 And) is a star system in the northern constellation of Andromeda, located to the west-northwest of Gamma Andromedae. 60 Andromedae is the Flamsteed designation though the star also bears the Bayer designation b Andromedae. It is bright enough to be seen by the naked eye with an apparent visual magnitude of 4.82.[2] Based upon parallax measurements made during the Hipparcos mission, it is at a distance of roughly 530 light-years (160 parsecs) from Earth.[1]

This article is about b Andromedae. It is not to be confused with β Andromedae.
60 Andromedae
Location of 60 Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  02h 13m 13.32387s[1]
Declination +44° 13′ 53.9546″[1]
Apparent magnitude (V) +4.82[2]
Characteristics
Spectral type K3.5 III Ba0.4[3]
U−B color index +1.74[2]
B−V color index +1.48[2]
Astrometry
Radial velocity (Rv)–46.3[4] km/s
Proper motion (μ) RA: –20.90[1] mas/yr
Dec.: –14.46[1] mas/yr
Parallax (π)6.15 ± 0.63[1] mas
Distanceapprox. 530 ly
(approx. 160 pc)
Orbit[5]
Period (P)748.2±0.4 days
Semi-major axis (a)3.0±2.6″
Eccentricity (e)0.34±0.03
Inclination (i)127±15°
Longitude of the node (Ω)6±17°
Periastron epoch (T)37886±11 HJD
Argument of periastron (ω)
(secondary)		358±6°
Details
60 And A
Mass2.0+0.7
−0.3[5] M☉
Surface gravity (log g)1.70±0.44[6] cgs
Temperature4054±42[6] K
Metallicity [Fe/H]−0.13±0.12[6] dex
60 And B
Mass0.5±0.1[5] M☉
Other designations
b Andromedae,[7] BD+43 447, HD 13520, HIP 10340, HR 643, IRAS 02100+4359, SAO 37867.
Database references
SIMBADdata

This system is known to have three components. The primary is a giant star with a stellar classification of K3.5 III Ba0.4, meaning that an overabundance of barium ionized one time is observed in the spectrum of the star, making it a barium star. The secondary component is likely a white dwarf with a period of 748.2 days and an eccentricity of 0.34. There is a third component at an angular separation of 0.22 arcseconds.[3]

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133: 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
  3. 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.
  4. Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  5. Pourbaix, D.; Boffin, H. M. J. (February 2003), "Reprocessing the Hipparcos Intermediate Astrometric Data of spectroscopic binaries. II. Systems with a giant component", Astronomy and Astrophysics, 398: 1163–1177, arXiv:astro-ph/0211483, Bibcode:2003A&A...398.1163P, doi:10.1051/0004-6361:20021736.
  6. Koleva, M.; Vazdekis, A. (February 2012), "Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library", Astronomy & Astrophysics, 538: A143, arXiv:1111.5449, Bibcode:2012A&A...538A.143K, doi:10.1051/0004-6361/201118065.
  7. Tirion; Rappaport; Lovi (1987). Willmann-Bell, Inc. (ed.). Uranometria 2000.0 - Volume II - The Southern Hemisphere to +6°. Richmond, Virginia, USA. ISBN 0-943396-15-8.
  1. "* 60 And". SIMBAD. Centre de données astronomiques de Strasbourg.
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