Kappa Arietis

Kappa Arietis
	Location of κ Arietis (circled)
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Aries
Right ascension	02h 06m 33.92497s
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,^[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]

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

^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b ^c ^d 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.
^ ^a ^b ^c 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b ^c ^d 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

Zdroj:https://en.wikipedia.org?pojem=Kappa_Arietis
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[GaiaDR2-1] ^ ^a ^b ^c ^d ^e ^f 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.

[aj83_606-2] 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.

[Anderson2012-3] 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.

[gcsrv-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.

[Jones1931-5] 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.

[aaass27_35-6] 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.

[aaa393_897-7] 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.

[SIMBAD-8] "kap Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-11.

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Observation data Epoch J2000.0 Equinox J2000.0
Location of κ Arietis (circled)
Constellation	Aries
Right ascension	02^h 06^m 33.92497^s^[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 (R_v)	+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]
Distance	181 ± 3 ly (55.5 ± 1.0 pc)
Absolute magnitude (M_V)	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

Luminosity	25^[3] `L`_☉
Surface gravity (log g)	4.0^[6] cgs
Temperature	8,700^[6] K
Metallicity	+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
SIMBAD	data