Astronomy:60 Andromedae

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Short description: Star system in the constellation Andromeda

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60 Andromedae
Location of 60 Andromedae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda[1]
Right ascension  02h 13m 13.322s[2]
Declination +44° 13′ 53.93″[2]
Apparent magnitude (V) +4.82[3]
Characteristics
Spectral type K3.5 III Ba0.4[4]
U−B color index +1.74[3]
B−V color index +1.48[3]
Astrometry
Radial velocity (Rv)–46.3[5] km/s
Proper motion (μ) RA: –20.90[6] mas/yr
Dec.: –14.46[6] mas/yr
Parallax (π)5.2634 ± 0.2576[2] mas
Distance620 ± 30 ly
(190 ± 9 pc)
Absolute magnitude (MV)−1.19[1]
Orbit[7]
Period (P)748.2±0.4 days
Semi-major axis (a)2.4±0.6 mas
Eccentricity (e)0.80
Inclination (i)54.1±19.9°
Longitude of the node (Ω)344.5±10.3°
Periastron epoch (T)37886±11 HJD
Argument of periastron (ω)
(secondary)		358±6°
Semi-amplitude (K1)
(primary)		4.88 km/s
Details
60 And A
Mass2.0+0.7
−0.3[8] M☉
Luminosity685[1] L☉
Surface gravity (log g)1.70±0.44[9] cgs
Temperature4,054±42[9] K
Metallicity [Fe/H]−0.13±0.12[9] dex
Age2.02[10] Gyr
60 And B
Mass0.5±0.1[8] M☉
Other designations
b Andromedae[11], BD+43 447, HD 13520, HIP 10340, HR 643, SAO 37867, PPM 44882, IRAS 02100+4359[12]
Database references
SIMBADdata

60 Andromedae is a star system in the northern constellation of Andromeda, located to the east-northeast of Gamma Andromedae. 60 Andromedae is the Flamsteed designation (abbreviated 60 And), though the star also bears the Bayer designation b Andromedae.[11] It is bright enough to be seen by the naked eye on a dark night, having an apparent visual magnitude of 4.82.[3] Based upon parallax measurements, it is located at a distance of approximately 620 light-years (190 parsecs) from Earth.[2] The system is drifting closer with a heliocentric radial velocity of –46 km/s.[5]

This system is known to have three components. The primary is an aging giant star with a stellar classification of K3.5 III Ba0.4, meaning that an overabundance of singly-ionized barium (Ba+ ion) is observed in the spectrum of the star, making it a barium star. This star is about 2[10] billion years old with double the mass of the Sun.[8] It is radiating 685[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,054 K.[9] The secondary component is likely a degenerate white dwarf with an orbital period of 748.2 days and an eccentricity of 0.34. There is a third component at an angular separation of 0.22 arcseconds.[4]

References

  1. ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society 133 (4): 475–493, doi:10.1093/mnras/133.4.475, Bibcode: 1966MNRAS.133..475A. 
  4. ↑ 4.0 4.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  5. ↑ 5.0 5.1 Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W. 
  6. ↑ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  7. ↑ Ren, Shulin; Fu, Yanning (March 2013), "Hipparcos Photocentric Orbits of 72 Single-lined Spectroscopic Binaries", The Astronomical Journal 145 (3): 7, doi:10.1088/0004-6256/145/3/81, 81, Bibcode: 2013AJ....145...81R. 
  8. ↑ 8.0 8.1 8.2 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 (3): 1163–1177, doi:10.1051/0004-6361:20021736, Bibcode: 2003A&A...398.1163P. 
  9. ↑ 9.0 9.1 9.2 9.3 Koleva, M.; Vazdekis, A. (February 2012), "Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library", Astronomy & Astrophysics 538: A143, doi:10.1051/0004-6361/201118065, Bibcode: 2012A&A...538A.143K. 
  10. ↑ 10.0 10.1 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L. 
  11. ↑ 11.0 11.1 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. 
  12. ↑ "60 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=60+And. 
  1. "* 60 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+60+And. 



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