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Delta Arae

January 01, 1970

Delta Arae, Latinized from δ Arae, is the Bayer designation for a double star in the southern constellation Ara. It has an apparent visual magnitude of 3.62[2] and is visible to the naked eye. Based upon an annual parallax of 16.48 mas, it is about 198 light-years (61 parsecs) distant from the Earth.[1]

Delta Arae

δ Arae (lower center) in the Ara Constellation
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ara
Right ascension 17h 31m 05.91272s[1]
Declination –60° 41′ 01.8522″[1]
Apparent magnitude (V) 3.62[2]
Characteristics
Spectral type B8 Vn[3] + G8 V[4]
U−B color index –0.31[2]
B−V color index –0.10[2]
Astrometry
Radial velocity (Rv)+10[5] km/s
Proper motion (μ) RA: –54.01[1] mas/yr
Dec.: –99.25[1] mas/yr
Parallax (π)16.48 ± 0.34 mas[1]
Distance198 ± 4 ly
(61 ± 1 pc)
Absolute magnitude (MV)−0.31[6]
Details
Mass3.56[7] M☉
Radius3.12 ± 0.15[8] R☉
Luminosity214[6] L☉
Surface gravity (log g)3.81 ± 0.06[8] cgs
Temperature11,962 ± 86[8] K
Rotational velocity (v sin i)255[4] km/s
Age125[9] Myr
Other designations
δ Ara, CPD –60° 6842, FK5 648, HD 158094, HIP 85727, HR 6500, SAO 253945.[10]
Database references
SIMBADdata

Delta Arae is massive B-type main sequence star with a stellar classification of B8 Vn.[3] The 'n' suffix indicates the absorption lines are spread out broadly because the star is spinning rapidly. It has a projected rotational velocity of 255 km/s, resulting in an equatorial bulge with a radius 13% larger than the polar radius.[4] It has a magnitude 9.5 companion G-type main sequence star that may form a binary star system with Delta Arae.[7]

There is a 12th magnitude optical companion located 47.4 arcseconds away along a position angle of 313°.[9]

Etymology edit

Delta Arae was known as 龜三 (meaning: "the 3rd (star) of Guī") in traditional Chinese astronomy.[11][12]

Allen erroneously called both Delta and Zeta Arae "Tseen Yin" (天陰).[13] He probably confused the constellation "Ara" with "Ari", as 天陰 is actually in Aries.[11][12]

See also edit

References edit

  1. ^ 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.
  2. ^ a b c d Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
  3. ^ a b Houk, Nancy (1979), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor: Dept. Of Astronomy, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. ^ a b c van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
  5. ^ 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, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
  6. ^ a b 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.
  7. ^ a b Shaya, Ed J.; Olling, Rob P. (January 2011), "Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue", The Astrophysical Journal Supplement, 192 (1): 2, arXiv:1007.0425, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2, S2CID 119226823.
  8. ^ a b c Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855, S2CID 119512018.
  9. ^ a b Ehrenreich, D.; et al. (November 2010), "Deep infrared imaging of close companions to austral A- and F-type stars", Astronomy and Astrophysics, 523: A73, arXiv:1007.0002, Bibcode:2010A&A...523A..73E, doi:10.1051/0004-6361/201014763, S2CID 54913363.
  10. ^ "del Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-27.{{cite web}}: CS1 maint: postscript (link)
  11. ^ a b Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIIIe siecle", Annales de l'Observatoire Astronomique de Zô-Sé.
  12. ^ a b 伊世同 (Yi Shi Tong) (1981): 『中西対照恒星図表』科学出版社.(in Chinese)
  13. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 64. ISBN 0-486-21079-0.

Further reading edit

  • 大崎正次 (1987): 「中国の星座・星名の同定一覧表」『中国の星座の歴史』 雄山閣出版, pp. 312, 328.(in Japanese)

External links edit

  • HR 6500
  • AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 1 日(in Chinese)

January 01, 1970
delta, arae, latinized, from, arae, bayer, designation, double, star, southern, constellation, apparent, visual, magnitude, visible, naked, based, upon, annual, parallax, about, light, years, parsecs, distant, from, earth, arae, lower, center, constellation, o. Delta Arae Latinized from d Arae is the Bayer designation for a double star in the southern constellation Ara It has an apparent visual magnitude of 3 62 2 and is visible to the naked eye Based upon an annual parallax of 16 48 mas it is about 198 light years 61 parsecs distant from the Earth 1 Delta Araed Arae lower center in the Ara Constellation Observation dataEpoch J2000 0 Equinox J2000 0 Constellation Ara Right ascension 17h 31m 05 91272s 1 Declination 60 41 01 8522 1 Apparent magnitude V 3 62 2 Characteristics Spectral type B8 Vn 3 G8 V 4 U B color index 0 31 2 B V color index 0 10 2 AstrometryRadial velocity Rv 10 5 km sProper motion m RA 54 01 1 mas yr Dec 99 25 1 mas yrParallax p 16 48 0 34 mas 1 Distance198 4 ly 61 1 pc Absolute magnitude MV 0 31 6 DetailsMass3 56 7 M Radius3 12 0 15 8 R Luminosity214 6 L Surface gravity log g 3 81 0 06 8 cgsTemperature11 962 86 8 KRotational velocity v sin i 255 4 km sAge125 9 Myr Other designationsd Ara CPD 60 6842 FK5 648 HD 158094 HIP 85727 HR 6500 SAO 253945 10 Database referencesSIMBADdata Delta Arae is massive B type main sequence star with a stellar classification of B8 Vn 3 The n suffix indicates the absorption lines are spread out broadly because the star is spinning rapidly It has a projected rotational velocity of 255 km s resulting in an equatorial bulge with a radius 13 larger than the polar radius 4 It has a magnitude 9 5 companion G type main sequence star that may form a binary star system with Delta Arae 7 There is a 12th magnitude optical companion located 47 4 arcseconds away along a position angle of 313 9 Contents 1 Etymology 2 See also 3 References 4 Further reading 5 External linksEtymology editDelta Arae was known as 龜三 meaning the 3rd star of Gui in traditional Chinese astronomy 11 12 Allen erroneously called both Delta and Zeta Arae Tseen Yin 天陰 13 He probably confused the constellation Ara with Ari as 天陰 is actually in Aries 11 12 See also editAra Chinese astronomy Aries Chinese astronomy 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 amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Nicolet B 1978 Photoelectric photometric Catalogue of homogeneous measurements in the UBV System Astronomy and Astrophysics Supplement Series 34 1 49 Bibcode 1978A amp AS 34 1N a b Houk Nancy 1979 Michigan catalogue of two dimensional spectral types for the HD stars Ann Arbor Dept Of Astronomy 1 Ann Arbor Michigan Dept of Astronomy University of Michigan Bibcode 1978mcts book H a b c van Belle Gerard T March 2012 Interferometric observations of rapidly rotating stars The Astronomy and Astrophysics Review 20 1 51 arXiv 1204 2572 Bibcode 2012A amp ARv 20 51V doi 10 1007 s00159 012 0051 2 S2CID 119273474 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 Proceedings from IAU Symposium no 30 vol 30 University of Toronto International Astronomical Union p 57 Bibcode 1967IAUS 30 57E a b 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 Shaya Ed J Olling Rob P January 2011 Very Wide Binaries and Other Comoving Stellar Companions A Bayesian Analysis of the Hipparcos Catalogue The Astrophysical Journal Supplement 192 1 2 arXiv 1007 0425 Bibcode 2011ApJS 192 2S doi 10 1088 0067 0049 192 1 2 S2CID 119226823 a b c Fitzpatrick E L Massa D March 2005 Determining the Physical Properties of the B Stars II Calibration of Synthetic Photometry The Astronomical Journal 129 3 1642 1662 arXiv astro ph 0412542 Bibcode 2005AJ 129 1642F doi 10 1086 427855 S2CID 119512018 a b Ehrenreich D et al November 2010 Deep infrared imaging of close companions to austral A and F type stars Astronomy and Astrophysics 523 A73 arXiv 1007 0002 Bibcode 2010A amp A 523A 73E doi 10 1051 0004 6361 201014763 S2CID 54913363 del Ara SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2012 07 27 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link a b Chevalier S and Tsuchihashi P 1911 Catalogue d Etoiles fixes observes a Pekin sous l Empereur Kien Long Qianlong Chien Lung XVIIIe siecle Annales de l Observatoire Astronomique de Zo Se a b 伊世同 Yi Shi Tong 1981 中西対照恒星図表 科学出版社 in Chinese Allen R H 1963 Star Names Their Lore and Meaning Reprint ed New York NY Dover Publications Inc p 64 ISBN 0 486 21079 0 Further reading edit大崎正次 1987 中国の星座 星名の同定一覧表 中国の星座の歴史 雄山閣出版 pp 312 328 in Japanese External links editHR 6500 AEEA Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 7 月 1 日 in Chinese Retrieved from https en wikipedia org w index php title Delta Arae amp oldid 1157598437, wikipedia, wiki, book, books, library,

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