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Kappa Arae

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Kappa Arae
Diagram showing star positions and boundaries of the Ara constellation and its surroundings
The location of κ Arae (circled)
Observation data
EpochJ2000EquinoxJ2000
Constellation Ara
Right ascension 17h26m00.04169s[1]
Declination –50° 38′ 00.6417″[1]
Apparent magnitude(V) 5.21[2]
Characteristics
Spectral type G8 III[3]
B−Vcolor 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 ± 0.40mas[1]
Distance460 ± 30ly
(140 ± 8pc)
Absolute magnitude(MV)–0.58[5]
Details
Radius14[6]R☉
Surface gravity(logg)2.3[5]cgs
Temperature4,950[5]K
Metallicity[Fe/H]–0.3[5]dex
Other designations
CD–50° 11269,HD157457,HIP85312,HR6468,SAO244734.[7]
Database references
SIMBADdata

Kappa Arae(κ Ara, κ Arae) is theBayer designationfor a single[8]starin the southernconstellationofAra.Based uponparallaxmeasurements, it is approximately 460light-years(140parsecs) distant from Earth, give or take a 30 light-yearmargin of error.[1]With anapparent visual magnitudeof 5.21,[2]this star is faintly visible to the naked eye.

This is agiant starwith astellar classificationof G8 III;[3]itsouter envelopehas expanded to about 14 times the radius of the Sun.[6]It is radiating energy into space at aneffective temperatureof 4,950 K.[5]This is hot enough for it to shine with the golden-hued glow of aG-type star.[9]

It has two 14th magnitudeoptical companionsthat are at anangular distanceof 25 and 30arcseconds.[citation needed]

References

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  1. ^abcdefvan 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,S2CID18759600.
  2. ^abcCorben, 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.
  3. ^abHouk, 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.
  4. ^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.
  5. ^abcdeJasniewicz, G.; et al. (February 1999), "Late-type giants with infrared excess. I. Lithium abundances",Astronomy and Astrophysics,342:831–838,Bibcode:1999A&A...342..831J
  6. ^abPasinetti 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,S2CID425754.
  7. ^"kap Ara".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2010-07-30.
  8. ^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.S2CID14878976.
  9. ^"The Colour of Stars",Australia Telescope, Outreach and Education,Commonwealth Scientific and Industrial Research Organisation,December 21, 2004, archived fromthe originalon February 22, 2012,retrieved2012-01-16.
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