Zeta Arae

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ζ Arae
Location of ζ Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 16h 58m 37.21217s[1]
Declination –55° 59′ 24.5203″[1]
Apparent magnitude (V) 3.13[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.96[2]
B−V color index +1.60[2]
Distance
570 ± 20 ly
(173 ± 5 pc)
Absolute magnitude (MV)–3.95[6]
Details
Myr
CPD−55° 7766[9]
Database references
SIMBADdata
ARICNSdata

Zeta Arae (ζ Ara, ζ Arae) is the third-brightest

apparent visual magnitude of this star is 3.1,[2] which can be seen from suburban skies in the southern hemisphere. From the parallax measurements, it is located at a distance of 490 light-years (150 parsecs) from Earth.[1]

The

luminosity class of 'III' indicates this is a giant star that has exhausted the hydrogen at its core and evolved away from the main sequence. It is radiating energy from its outer atmosphere at an effective temperature of 4,246 K which is what gives it the orange hue of a K-type star.[11] This star displays an excess of infrared emission that may indicate circumstellar matter.[12]

In

Chinese name for ζ Arae itself is 龜五 (Guī wǔ, English: the Fifth Star of Tortoise.)[14]

Allen called it Tseen Yin /ˌsiːnˈjɪn/, together with δ Arae, from the Chinese 天陰 (Mandarin pronunciation tiānyīn) "dark sky".[15] However, 天陰 is in Aries.[16][17] so Allen probably confused constellation "Ara" with "Ari".

References

  1. ^
    S2CID 18759600
  2. ^
    Bibcode:1966CoLPL...4...99J
  3. ^
    Bibcode:1975mcts.book.....H
  4. Bibcode:1999VeARI..35....1W
  5. doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  6. Bibcode:1999A&A...342..831J
  7. ^
    S2CID 49573767
    .
  8. doi:10.1093/mnras/256.3.535
  9. ^ "zet Ara -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-05
  10. ^ Kaler, Jim (13 July 2012). "Zeta Arae". Stars. University of Illinois. Retrieved 12 September 2019.
  11. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, retrieved 2012-01-16
  12. Bibcode:1997A&A...323..513P
  13. ISBN 978-986-7332-25-7
    .
  14. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 1 日
  15. ISBN 0-486-21079-0
    .
  16. Zô-Sé
    .
  17. ^ 伊世同 (Yi Shi Tong) (1981): 『中西対照恒星図表』科学出版社.(in Chinese)

External links

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