Kappa Arietis

Kappa Arietis, Latinized from κ Arietis, is the Bayer designation for a binary star in the northern constellation of Aries. The combined apparent visual magnitude of the pair is 5.02,[2] making the system bright enough for it to be dimly visible to the naked eye as a white-hued point of light. It is located approximately 181 light-years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +11.5 km/s.[4]

Kappa Arietis
Location of κ Arietis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aries
Right ascension 02h 06m 33.92497s[1]
Declination +22° 38′ 53.9476″[1]
Apparent magnitude (V) 5.02[2]
Characteristics
Spectral type A2m[3]
U−B color index +0.11[2]
B−V color index +0.12[2]
Astrometry
Radial velocity (Rv)+11.5[4] km/s
Proper motion (μ) RA: +20.348[1] mas/yr
Dec.: −35.671[1] mas/yr
Parallax (π)18.0292 ± 0.3092 mas[1]
Distance181 ± 3 ly
(55.5 ± 1.0 pc)
Absolute magnitude (MV)1.30[3]
Orbit[5]
Period (P)15.2938 d
Eccentricity (e)0.61
Periastron epoch (T)2,421,844.121 JD
Argument of periastron (ω)
(secondary)		358.3°
Semi-amplitude (K1)
(primary)		34.5 km/s
Semi-amplitude (K2)
(secondary)		35.4 km/s
Details
Luminosity25[3] L☉
Surface gravity (log g)4.0[6] cgs
Temperature8,700[6] K
Metallicity [Fe/H]+0.18[6] dex
Rotational velocity (v sin i)18[7] km/s
Other designations
κ Ari, 12 Arietis, BD+21°279, HD 12869, HIP 9836, HR 613, SAO 75146[8]
Database references
SIMBADdata

The binary nature of this system was announced in 1918 by Lick Observatory. It is a double-lined spectroscopic binary with an orbital period of 15.3 days and an eccentricity of 0.61.[5] Both components displaying the spectral properties of an Am, or metallic-lined star. They have nearly the same brightness and their mass ratio is 1.03; very close to equal.[6]

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. Gaia DR2 record for this source at VizieR.
  2. Mendoza, E. E.; et al. (June 1978), "UBVRI photometry of 225 AM stars", Astronomical Journal, 83: 606–614, Bibcode:1978AJ.....83..606M, doi:10.1086/112242.
  3. 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.
  4. 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.
  5. Jones, Rebecca B. (1931), "The orbit of the spectroscopic binary κ Arietis", Lick Observatory Bulletin, Berkeley: University of California Press, 433: 117–122, Bibcode:1931LicOB..15..117J, doi:10.5479/ADS/bib/1931LicOB.15.117J.
  6. Mitton, J. (January 1977), "Spectroscopic observations and curve-of-growth analyses of the four A stars omicron Peg, beta Ari, kappa Ari and 32 Vir", Astronomy and Astrophysics Supplement Series, 27: 35–46, Bibcode:1977A&AS...27...35M.
  7. Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
  8. "kap Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-11.
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