Zeta Capricorni

ζ Capricorni
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Capricornus
Right ascension 21h26m40.0s
Declination −22°24′41″
Apparent magnitude (V) +3.77
Distance398 ± 44 ly
(122 ± 13 pc)
Spectral typeG8III + DA2.2[1]
Other designations
34 Capricorni HR 8204, HD 204075, CD−22°15388, FK5 806, HIP 105881, SAO 190341, GC 30020, ADS 14971, CCDM J21267-2225

Zeta Capricorni, (ζ Cap, ζ Capricorni), is a fourth-magnitude star in the constellation Capricornus. ζ Capricorni is a binary star, with the primary component ζ Capricorni A being a yellow G-type giant with an apparent magnitude of +3.77. It is considered one of the prototypical examples of a Barium star, properties of which include overabundances of carbon molecules (such as C2) and s-process elements. Zeta Capricorni has an overabundance of the s-process element praseodymium.

Its companion, ζ Capricorni B is a white dwarf.

The ζ Capricorni binary system is approximately 398 light years from Earth.

Chinese Name

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.[2] Consequently, ζ Capricorni itself represents the state of Yan (燕).,[3] together with ν Ophiuchi in Left Wall of Heavenly Market Enclosure (asterism).[4]

References

  1. ↑ Holberg, J. B.; Oswalt, T. D.; Sion, E. M.; Barstow, M. A.; Burleigh, M. R. (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.
  2. ↑ (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.
  3. ↑ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Capricornus
  4. ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 23 日
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