Location of κ Arietis (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aries |
| Right ascension | 02 06 33.92497 |
| Declination | +22° 38′ 53.9476″ |
| Apparent magnitude (V) | 5.02 |
| Characteristics | |
| Spectral type | A2m |
| U−B color index | +0.11 |
| B−V color index | +0.12 |
| Astrometry | |
| Radial velocity (Rv) | +11.5 km/s |
| Proper motion (μ) | RA: +20.348 mas/yr Dec.: −35.671 mas/yr |
| Parallax (π) | 18.0292 ± 0.3092 mas |
| Distance | 181 ± 3 ly (55.5 ± 1.0 pc) |
| Absolute magnitude (MV) | 1.30 |
| Orbit | |
| 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 | |
| Luminosity | 25 L☉ |
| Surface gravity (log g) | 4.0 cgs |
| Temperature | 8,700 K |
| Metallicity | +0.18 dex |
| Rotational velocity (v sin i) | 18 km/s |
| Other designations | |
| κ Ari, 12 Arietis, BD+21°279, HD 12869, HIP 9836, HR 613, SAO 75146 | |
| Database references | |
| SIMBAD | data |
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, 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, and is drifting further away with a radial velocity of +11.5 km/s.
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. 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.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Jones, Rebecca B. (1931), "The orbit of the spectroscopic binary κ Arietis", Lick Observatory Bulletin, 433, Berkeley: University of California Press: 117–122, Bibcode:1931LicOB..15..117J, doi:10.5479/ADS/bib/1931LicOB.15.117J.
- ^ 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.
- 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.
- "kap Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-11.
External links
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