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Zeta Capricorni

October 21, 2023

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]

Zeta Capricorni
Location of ζ Capricorni (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Capricornus
Right ascension 21h 26m 40.02634s[1]
Declination −22° 24′ 40.8042″[1]
Apparent magnitude (V) 3.77[2]
Characteristics
Spectral type G4Ib: Ba2[3] + DA2.2[4]
U−B color index +0.57[5]
B−V color index +0.99[5]
Variable type Suspected eclipsing binary[6][7]
Astrometry
Radial velocity (Rv)+2.1±0.1[2] km/s
Proper motion (μ) RA: −2.23[1] mas/yr
Dec.: 18.10[1] mas/yr
Parallax (π)8.46 ± 0.21 mas[1]
Distance386 ± 10 ly
(118 ± 3 pc)
Absolute magnitude (MV)−1.59[2]
Orbit[8]
Period (P)2,378.2 d
Semi-major axis (a)8.56±4.3 mas
1.00+1.69
−0.44 AU
Eccentricity (e)0.2821
Inclination (i)111.7±20.7°
Longitude of the node (Ω)190.7±50.0°
Periastron epoch (T)2,445,996 JD
Argument of periastron (ω)
(secondary)		233.8±19.8°
Details[9]
A
Mass4.5+0.3
−0.2 M☉
Radius~29[10] R☉
Luminosity561+180
−143 L☉
Surface gravity (log g)1.7±0.3 cgs
Temperature5,269±53 K
Metallicity [Fe/H]−0.09 dex
B
Mass1.03 M☉
Temperature23,000[4] K
Other designations
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]
Database references
SIMBADdata

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

  1. ^ a b c d e f van Leeuwen, F. (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. Vizier catalog entry
  2. ^ a b c d e 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.
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ a b Srivastava, R. K. (July 1988). "Eclipsing Binary Signatures in zeta Capricorni". Information Bulletin on Variable Stars. 3217: 1. Bibcode:1988IBVS.3217....1S.
  7. ^ 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.
  8. ^ 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.
  9. ^ 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.
  10. ^ a b Kaler, James B. "ZETA CAP (Zeta Capricorni)". Stars. Retrieved 30 December 2016.
  11. ^ "zet Cap". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 December 2016.
  12. ^ 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.
  13. ^ 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.
  14. ^ 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.
  15. ^ 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.
  16. ^ 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.
  17. ^ 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.
  18. ^ 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.
  19. ^ 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.
  20. ^ (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.
  21. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Capricornus
  22. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 23 日

October 21, 2023
zeta, capricorni, latinised, from, capricorni, binary, star, system, southern, constellation, capricornus, visible, naked, with, apparent, visual, magnitude, system, located, distance, approximately, light, years, from, based, parallax, drifting, further, away. Zeta Capricorni Latinised from z 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 Zeta CapricorniLocation of z Capricorni circled Observation dataEpoch J2000 Equinox J2000Constellation CapricornusRight ascension 21h 26m 40 02634s 1 Declination 22 24 40 8042 1 Apparent magnitude V 3 77 2 CharacteristicsSpectral type G4Ib Ba2 3 DA2 2 4 U B color index 0 57 5 B V color index 0 99 5 Variable type Suspected eclipsing binary 6 7 AstrometryRadial velocity Rv 2 1 0 1 2 km sProper motion m RA 2 23 1 mas yr Dec 18 10 1 mas yrParallax p 8 46 0 21 mas 1 Distance386 10 ly 118 3 pc Absolute magnitude MV 1 59 2 Orbit 8 Period P 2 378 2 dSemi major axis a 8 56 4 3 mas 1 00 1 69 0 44 AUEccentricity e 0 2821Inclination i 111 7 20 7 Longitude of the node W 190 7 50 0 Periastron epoch T 2 445 996 JDArgument of periastron w secondary 233 8 19 8 Details 9 AMass4 5 0 3 0 2 M Radius 29 10 R Luminosity561 180 143 L Surface gravity log g 1 7 0 3 cgsTemperature5 269 53 KMetallicity Fe H 0 09 dexBMass1 03 M Temperature23 000 4 KOther designationsz 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 Database referencesSIMBADdataProperties EditThe binary nature of this system was announced in 1980 by Erika Bohm 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 EditIn Chinese 十二國 Shier Guo 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 z Capricorni f Capricorni i Capricorni 38 Capricorni 35 Capricorni 36 Capricorni x Capricorni 8 Capricorni 30 Capricorni 33 Capricorni 19 Capricorni 26 Capricorni 27 Capricorni 20 Capricorni h Capricorni and 21 Capricorni 20 Consequently the Chinese name for z Capricorni itself represents the state of Yan 燕 21 together with n Ophiuchi in Left Wall of Heavenly Market Enclosure asterism 22 References Edit a b c d e f van Leeuwen F 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 Vizier catalog entry a b c d e 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 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 amp 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 amp Astrophysics 626 28 arXiv 1904 03975 Bibcode 2019A amp 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 donnees 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 amp Astrophysics 586 16 arXiv 1510 05908 Bibcode 2016A amp 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 Retrieved from https en wikipedia org w index php title Zeta Capricorni amp oldid 1170224578, wikipedia, wiki, book, books, library,

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