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Star in the constellation Capricornus
Location of ζ Capricorni (circled)
Capricornus
21 h 26 m 40.02634s [1]
−22° 24 ′ 40.8042″[1]
3.77[2]
G4Ib: Ba2[3] + DA2.2[4]
+0.57[5]
+0.99[5]
Suspected eclipsing binary [6] [7]
+2.1± 0.1[2] km/s
RA: −2.23[1] mas /yr Dec.: 18.10[1] mas /yr
8.46 ± 0.21 mas [1]
386 ± 10 ly (118 ± 3 pc )
−1.59[2]
2,378.2 d
8.56± 4.3 mas 1.00+1.69 −0.44 AU
0.2821
111.7± 20.7 °
190.7± 50.0 °
2,445,996 JD
233.8± 19.8 °
4.5+0.3 −0.2 M ☉
~29[10] R ☉
561+180 −143 L ☉
1.7± 0.3 cgs
5,269± 53 K
−0.09 dex
1.03 M ☉
23,000[4] K
ζ Cap , 34 Cap , NSV 25596, CD −22°15388 , GC 30020, HD 204075, HIP 105881, HR 8204, SAO 190341, CCDM J21267-2225AB , WDS J21267-2225AB , WD 2123-226[11]
data
Zeta Capricorni , Latinised from ζ Capricorni, is a binary star system in the southern constellation of Capricornus . It is visible to the naked eye with an apparent visual magnitude of 3.77.[2] The system is located at a distance of approximately 386 light-years from the Sun based on parallax .[1] It is drifting further away with a radial velocity of +2 km/s. The absolute magnitude of this system is −1.59.[2]
Properties [ edit ]
The binary nature of this system was announced in 1980 by Erika Böhm-Vitense based on an ultraviolet excess attributed to a white dwarf companion.[12] It is a single-lined spectroscopic binary system.[13] Based on an incomplete orbital arc, the orbital period for this system is 6.5 years and the eccentricity (ovalness) is 0.28.[8] It was flagged as a suspected eclipsing binary in 1988 due to observed variations in the light curve .[6] [7]
The primary, designated component A, has a stellar classification of G4Ib: Ba2.[3] This notation indicates this is a yellow-hued supergiant star, although the ':' means there is some uncertainty about the class. The temperature and surface gravity of this object suggests it may be a horizontal-branch star.[14] It is considered a prototypical example of a Barium star ,[4] as indicated by the 'Ba2' class suffix. The properties of these objects include overabundances of carbon molecules (such as C2 ) and s-process elements.[13] Zeta Capricorni has an overabundance of the s-process element praseodymium .[15] [16]
Its companion, component B, is a carbon-oxygen white dwarf [17] with a hydrogen -rich atmosphere and a class of DA2.2.[4] It is about as massive as the Sun , and its temperature is 23,000 K . In the course of its evolution, the progenitor star passed through the thermally pulsing asymptotic giant branch , during which the enlarged atmosphere transferred material to the primary.[4] The abundance of niobium in the primary's atmosphere, a product of the decay of zirconium-93 , is at a level that suggests the transfer to the primary took place more than three million years ago.[18]
A magnitude 12.5 visual companion [10] was discovered by T. J. J. See in 1897. As of 1997, it was located at an angular separation of 17.30″ along a position angle of 12°.[19]
Chinese name [ edit ]
In Chinese , 十二國 (Shíer Guó ), meaning Twelve States , refers to an asterism which represents twelve ancient states in the Spring and Autumn period and the Warring States period , consisting of ζ Capricorni, φ Capricorni , ι Capricorni , 38 Capricorni , 35 Capricorni , 36 Capricorni , χ Capricorni , θ Capricorni , 30 Capricorni , 33 Capricorni , 19 Capricorni , 26 Capricorni , 27 Capricorni , 20 Capricorni , η Capricorni and 21 Capricorni .[20] Consequently, the Chinese name for ζ Capricorni itself represents the state of Yan (燕 ),[21] together with ν Ophiuchi in Left Wall of Heavenly Market Enclosure (asterism).[22]
References [ edit ]
^ a b Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series . 71 : 245. Bibcode :1989ApJS...71..245K . doi :10.1086/191373 .
^ a b c d e Holberg, J. B.; et al. (2013). "Where are all the Sirius-like binary systems?". Monthly Notices of the Royal Astronomical Society . 435 (3 ): 2077. arXiv :1307.8047 . Bibcode :2013MNRAS.435.2077H . doi :10.1093/mnras/stt1433 .
^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. SIMBAD . Bibcode :1986EgUBV........0M .
^ a b Srivastava, R. K. (July 1988). "Eclipsing Binary Signatures in zeta Capricorni". Information Bulletin on Variable Stars . 3217 : 1. Bibcode :1988IBVS.3217....1S .
^ a b Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports . 61 (1 ): 80. Bibcode :2017ARep...61...80S . doi :10.1134/S1063772917010085 . S2CID 125853869 .
^ a b Pourbaix, D. (2000). "Re-processing the Hipparcos Transit Data and Intermediate Astrometric Data of spectroscopic binaries. I. Ba, CH and Tc-poor S stars". Astronomy and Astrophysics Supplement . 145 : 161–183. arXiv :astro-ph/0006175 . Bibcode :2000A&AS..145..161P . doi :10.1051/aas:2000346 . S2CID 15990458 .
^ Jorissen, A.; et al. (June 2019). "Barium and related stars, and their white-dwarf companions. I. Giant stars". Astronomy & Astrophysics . 626 : 28. arXiv :1904.03975 . Bibcode :2019A&A...626A.127J . doi :10.1051/0004-6361/201834630 . S2CID 102351666 . A127.
^ a b Kaler, James B. "ZETA CAP (Zeta Capricorni)" . Stars . Retrieved 30 December 2016 .
^ "zet Cap" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 28 December 2016 .
^ Boehm-Vitense, E. (July 1980). "The white dwarf companion of the barium star ZET Cap" . Astrophysical Journal . 239 : L79–L83. Bibcode :1980ApJ...239L..79B . doi :10.1086/183296 .
^ a b Smith, V. V.; et al. (December 1980). "A spectrum analysis of the bright barium star ZET Cap" . Publications of the Astronomical Society of the Pacific . 92 : 809–818. Bibcode :1980PASP...92..809S . doi :10.1086/130755 . S2CID 121743938 .
^ de Castro, D. B.; et al. (July 2016). "Chemical abundances and kinematics of barium stars". Monthly Notices of the Royal Astronomical Society . 459 (4 ): 4299–4324. arXiv :1604.03031 . Bibcode :2016MNRAS.459.4299D . doi :10.1093/mnras/stw815 .
^ Warner, B. (1965). "The barium stars" . Monthly Notices of the Royal Astronomical Society . 129 (3 ): 263. Bibcode :1965MNRAS.129..263W . doi :10.1093/mnras/129.3.263 .
^ Allen, M. S.; Cowley, C. R. (1974). "Resolution of the praseodymium abundance anomaly in the Ba II stars". The Astrophysical Journal . 190 : 601. Bibcode :1974ApJ...190..601A . doi :10.1086/152917 .
^ Merle, T.; et al. (February 2016). "To Ba or not to Ba: Enrichment in s-process elements in binary systems with WD companions of various masses". Astronomy & Astrophysics . 586 : 16. arXiv :1510.05908 . Bibcode :2016A&A...586A.151M . doi :10.1051/0004-6361/201526944 . S2CID 119224869 . A151.
^ Smith, V. V.; Lambert, D. L. (March 1984). "Niobium and rubidium in the barium star zeta Capricorni" . Publications of the Astronomical Society of the Pacific . 96 : 226–230. Bibcode :1984PASP...96..226S . doi :10.1086/131325 . S2CID 120973064 .
^ Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog" . The Astronomical Journal . 122 (6 ): 3466–3471. Bibcode :2001AJ....122.3466M . doi :10.1086/323920 .
^ (in Chinese) 中國星座神話 , written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7 .
^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Capricornus
^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年6 月23 日 Archived 2021-05-15 at the Wayback Machine
β2
γ (Nashira)
δ (Deneb Algedi)
ε
ζ
η
θ
ι
κ
λ
μ
ν (Alshat)
ξ1
ξ2
ο1
ο2
π
ρ
σ
τ1
τ2
υ
φ
χ
ψ
ω
4
17
19
20
21
24 (A )
27
29
30
31
33
35
36 (b )
37
41
42
44
45
46 (c )
47 (c 2 )
50
7845
7898
202206
204313
LP 816-60
HD 202772 Ab
PSO J318.5−22
7030
7035
7035A
7073
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Zeta_Capricorni&oldid=1223526135 "
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a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n .
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