Kappa Arietis

Kappa Arietis
Diagram showing star positions and boundaries of the Aries constellation and its surroundings


Location of κ Arietis (circled)

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aries
Right ascension 02h 06m 33.92388s[1]
Declination +22° 38′ 53.9267″[1]
Apparent magnitude (V) 5.02[2]
Characteristics
U−B color index +0.11[2]
B−V color index +0.12[2]
Astrometry
Radial velocity (Rv)+11.5[3] km/s
Proper motion (μ) RA: +17.86[1] mas/yr
Dec.: –37.55[1] mas/yr
Parallax (π)17.96 ± 0.37 mas
Distance182 ± 4 ly
(56 ± 1 pc)
Details
Surface gravity (log g)4.0[4] cgs
Temperature8,700[4] K
Metallicity [Fe/H]+0.18[4] dex
Rotational velocity (v sin i)18[5] km/s
Other designations
12 Arietis, BD+21 279, HD 12869, HIP 9836, HR 613, SAO 75146[6]

Kappa Arietis (κ Ari, κ Arietis) is the Bayer designation for a binary star in the northern constellation of Aries. It is approximately 182 light-years (56 parsecs) distant from Earth. 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. Kappa Arietis is a double-lined spectroscopic binary with 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.[4] Their orbital period is 15.2938 days and they have a high eccentricity of 0.61.[7]

References

  1. 1 2 3 4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (June 1978), "UBVRI photometry of 225 AM stars", Astronomical Journal, 83: 606–614, Bibcode:1978AJ.....83..606M, doi:10.1086/112242.
  3. ↑ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  4. 1 2 3 4 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.
  5. ↑ 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/0205255Freely accessible, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943.
  6. ↑ "kap Ari -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-08-04.
  7. ↑ Abt, Helmut A. (August 2005), "Observed Orbital Eccentricities", The Astrophysical Journal, 629 (1): 507–511, Bibcode:2005ApJ...629..507A, doi:10.1086/431207.


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