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Zeta Arae

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ζ Arae
Location of ζ Arae (circled)
Observation data
EpochJ2000EquinoxJ2000
Constellation Ara
Right ascension 16h58m37.21217s[1]
Declination –55° 59′ 24.5203″[1]
Apparent magnitude(V) 3.13[2]
Characteristics
Spectral type K3 III[3]
U−Bcolor index +1.96[2]
B−Vcolor index +1.60[2]
Astrometry
Radial velocity(Rv)–6.0[4]km/s
Proper motion(μ)RA:–17.80[1]mas/yr
Dec.:–36.67[1]mas/yr
Parallax(π)5.7725 ± 0.1727mas[5]
Distance570 ± 20ly
(173 ± 5pc)
Absolute magnitude(MV)–3.95[6]
Details
Mass7-8[7]M☉
Radius114[7]R☉
Luminosity3,800[7]L☉
Surface gravity(logg)1.20[7]cgs
Temperature4,246[7]K
Metallicity[Fe/H]–0.40[8]dex
Age40~50Myr
Other designations
Tseen Yin,GJ9581,SAO244315,HD152786,FK5631,HIP83081,HR6285,CPD−55° 7766[9]
Database references
SIMBADdata
ARICNSdata

Zeta Arae(ζ Ara, ζ Arae) is the third-brighteststarin the southernconstellationAra.[10]Theapparent visual magnitudeof this star is 3.1,[2]which can be seen from suburban skies in the southern hemisphere. From theparallaxmeasurements, it is located at a distance of 490light-years(150parsecs) from Earth.[1]

Thespectrumof this star matches astellar classificationof K3 III.[3]Theluminosity classof 'III' indicates this is agiant starthat has exhausted the hydrogen at its core andevolvedaway from themain sequence.It is radiating energy from its outer atmosphere at aneffective temperatureof 4,246 K which is what gives it the orange hue of a K-type star.[11]This star displays anexcess of infrared emissionthat may indicate circumstellar matter.[12]

InChinese,Quy(Guī), meaningTortoise,refers to an asterism consisting of ζ Arae,ε1Arae,γ Arae,δ Araeandη Arae.[13]Consequently, theChinese namefor ζ Arae itself isQuy ngũ(Guī wǔ,English:the Fifth Star of Tortoise.)[14]

Allen called itTseen Yin/ˌsiːnˈjɪn/,together withδ Arae,from the Chinese thiên âm (Mandarin pronunciationtiānyīn) "dark sky".[15]However, thiên âm is in Aries.[16][17]so Allen probably confused constellation "Ara"with"Ari".

References

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  1. ^abcdevan 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. ^abcdJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars",Communications of the Lunar and Planetary Laboratory,4(99): 99,Bibcode:1966CoLPL...4...99J
  3. ^abHouk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars",University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0,1,Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1975mcts.book.....H
  4. ^Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions",Veröff. Astron. Rechen-Inst. Heidelb,35(35), Astronomisches Rechen-Institut Heidelberg: 1,Bibcode:1999VeARI..35....1W
  5. ^Brown, A. G. A.;et al. (Gaia collaboration) (2021)."GaiaEarly Data Release 3: Summary of the contents and survey properties ".Astronomy & Astrophysics.649:A1.arXiv:2012.01533.Bibcode:2021A&A...649A...1G.doi:10.1051/0004-6361/202039657.S2CID227254300.(Erratum:doi:10.1051/0004-6361/202039657e).Gaia EDR3 record for this sourceatVizieR.
  6. ^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..831J
  7. ^abcdeCruzalèbes, P.; Jorissen, A.; Rabbia, Y.; Sacuto, S.; Chiavassa, A.; Pasquato, E.; Plez, B.; Eriksson, K.; Spang, A.; Chesneau, O. (2013)."Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER".Monthly Notices of the Royal Astronomical Society.434(1): 437.arXiv:1306.3288.Bibcode:2013MNRAS.434..437C.doi:10.1093/mnras/stt1037.S2CID49573767.
  8. ^Jones, K. L.; et al. (June 1992), "Spectroscopic investigation of cool giants and the authenticity of their reported microwave emission",Monthly Notices of the Royal Astronomical Society,256(3): 535–544,Bibcode:1992MNRAS.256..535J,doi:10.1093/mnras/256.3.535
  9. ^"zet Ara -- Star",SIMBAD,Centre de Données astronomiques de Strasbourg,retrieved2012-01-05
  10. ^Kaler, Jim (13 July 2012)."Zeta Arae".Stars.University of Illinois.Retrieved12 September2019.
  11. ^"The Colour of Stars",Australia Telescope, Outreach and Education,Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived fromthe originalon 2013-12-03,retrieved2012-01-16
  12. ^Plets, H.; et al. (July 1997), "Giants with infrared excess",Astronomy and Astrophysics,323:513–523,Bibcode:1997A&A...323..513P
  13. ^(in Chinese)Trung quốc tinh tọa thần thoại,written by trần cửu kim. Published by đài loan thư phòng xuất bản hữu hạn công tư, 2005,ISBN978-986-7332-25-7.
  14. ^(in Chinese)AEEA (Activities of Exhibition and Education in Astronomy) thiên văn giáo dục tư tấn võng 2006 niên 7 nguyệt 1 nhật
  15. ^Allen, R. H.(1963).Star Names: Their Lore and Meaning(Reprint ed.). New York, NY: Dover Publications Inc. p.64.ISBN0-486-21079-0.
  16. ^Chevalier, S.,andTsuchihashi, P.,(1911): "Catalogue d'Étoiles fixes, observés aPekinsous l'Empereur Kien Long(Qianlong (Chien-Lung)), XVIIIesiecle ",Annales de l'Observatoire Astronomique deZô-Sé.
  17. ^Y thế đồng(Yi Shi Tong) (1981):『 trung tây đối chiếu hằng tinh đồ biểu 』 khoa học xuất bản xã.(in Chinese)
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