Kappa Arae (κ Ara, κ Arae) is the Bayer designation for a single[8] star in the southern constellation of Ara. Based upon parallax measurements, it is approximately 460 light-years (140 parsecs) distant from Earth, give or take a 30 light-year margin of error.[1] With an apparent visual magnitude of 5.21,[2] this star is faintly visible to the naked eye.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 26m 00.04169s[1] |
| Declination | –50° 38′ 00.6417″[1] |
| Apparent magnitude (V) | 5.21[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| B−V color index | 1.05[2] |
| Astrometry | |
| Radial velocity (Rv) | 17.3[4] km/s |
| Proper motion (μ) | RA: 13.45[1] mas/yr Dec.: 8.36[1] mas/yr |
| Parallax (π) | 7.16 ± 0.40 mas[1] |
| Distance | 460 ± 30 ly (140 ± 8 pc) |
| Absolute magnitude (MV) | –0.58[5] |
| Details | |
| Radius | 14[6] R☉ |
| Surface gravity (log g) | 2.3[5] cgs |
| Temperature | 4,950[5] K |
| Metallicity [Fe/H] | –0.3[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a giant star with a stellar classification of G8 III;[3] its outer envelope has expanded to about 14 times the radius of the Sun.[6] It is radiating energy into space at an effective temperature of 4,950 K.[5] This is hot enough for it to shine with the golden-hued glow of a G-type star.[9]
It has two 14th magnitude optical companions that are at an angular distance of 25 and 30 arcseconds.[citation needed]
References
edit- ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.653-664&rft.date=2007-11&rft_id=info:arxiv/0708.1752&rft_id=https://api.semanticscholar.org/CorpusID:18759600#id-name=S2CID&rft_id=info:doi/10.1051/0004-6361:20078357&rft_id=info:bibcode/2007A&A...474..653V&rft.aulast=van Leeuwen&rft.aufirst=F.&rfr_id=info:sid/en.wikipedia.org:Kappa Arae" class="Z3988">
- ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
- ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.). Determination of Radial Velocities and their Applications. IAU Symposium no. 30. Vol. 30. University of Toronto: International Astronomical Union. p. 57. Bibcode:1967IAUS...30...57E.
- ^ a b c d e Jasniewicz, G.; et al. (February 1999), "Late-type giants with infrared excess. I. Lithium abundances", Astronomy and Astrophysics, 342: 831–838, Bibcode:1999A&A...342..831J831-838&rft.date=1999-02&rft_id=info:bibcode/1999A&A...342..831J&rft.aulast=Jasniewicz&rft.aufirst=G.&rft.au=Parthasarathy, M.&rft.au=de Laverny, P.&rft.au=Thévenin, F.&rfr_id=info:sid/en.wikipedia.org:Kappa Arae" class="Z3988">
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.521-524&rft.date=2001-02&rft_id=info:arxiv/astro-ph/0012289&rft_id=https://api.semanticscholar.org/CorpusID:425754#id-name=S2CID&rft_id=info:doi/10.1051/0004-6361:20000451&rft_id=info:bibcode/2001A&A...367..521P&rft.aulast=Pasinetti Fracassini&rft.aufirst=L. E.&rft.au=Pastori, L.&rft.au=Covino, S.&rft.au=Pozzi, A.&rfr_id=info:sid/en.wikipedia.org:Kappa Arae" class="Z3988">
- ^ "kap Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-07-30.
- ^ 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.869-879&rft.date=2008-09&rft_id=info:arxiv/0806.2878&rft_id=https://api.semanticscholar.org/CorpusID:14878976#id-name=S2CID&rft_id=info:doi/10.1111/j.1365-2966.2008.13596.x&rft_id=info:bibcode/2008MNRAS.389..869E&rft.aulast=Eggleton&rft.aufirst=P. P.&rft.au=Tokovinin, A. A.&rft_id=https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x&rfr_id=info:sid/en.wikipedia.org:Kappa Arae" class="Z3988">
- ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on February 22, 2012, retrieved 2012-01-16.