Английская Википедия:Gamma Gruis
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Gamma Gruis or γ Gruis, formally named Aldhanab (Шаблон:IPAc-en),[1] is a star in the southern constellation of Grus (it once belonged to the Ptolemaic constellation Piscis Austrinus). With an apparent visual magnitude of 3.0,[2] it is the third-brightest star in Grus. Based upon parallax measurements, this star is located at a distance of roughly Шаблон:Convert from the Sun.[3]
Nomenclature
γ Gruis (Latinised to Gamma Gruis) is the system's Bayer designation.
It bore the traditional Arabic name Al Dhanab, from the Arabic الذنب al-dhanab "the tail" (of the Southern Fish)[4]when it was still part of Piscis Austrinus with the Bayer designation κ Piscis Austrini (Kappa Piscis Austrini). In 2016, the IAU organized a Working Group on Star Names (WGSN)[5] to catalog and standardize proper names for stars. The WGSN approved the name Aldhanab for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[1]
In Chinese, Шаблон:Lang (Шаблон:Lang), meaning Decayed Mortar, refers to an asterism consisting of Gamma Gruis, Lambda Gruis, Gamma Piscis Austrini and 19 Piscis Austrini.[6] Consequently, the Chinese name for Gamma Gruis itself is Шаблон:Lang (Шаблон:Lang, Шаблон:Lang-en.)[7]
Properties
Analysis of the spectrum by N. Houk in 1979 shows it to match a stellar classification of B8 III,[8] with the luminosity class of III indicating this is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence. R. O. Gray and R. F. Garrison in 1989 found a less evolved class of B8IV-Vs.[9] The luminosity of Gamma Gruis is around 390 times that of the Sun, with a significant portion of the energy emission being in the ultraviolet.[10] Its outer envelope has an effective temperature of 12,520 K,[11] which gives the star a blue-white hue. Gamma Gruis is rotating relatively rapidly with a projected rotational velocity of Шаблон:Nowrap.[12] By way of comparison, the Sun has an azimuthal velocity along its equator of just Шаблон:Nowrap.
Based upon analysis of data collected during the Hipparcos mission, this star may have a proper motion companion that is causing gravitational perturbation of Gamma Gruis.[13]
See also
References
- ↑ 1,0 1,1 Шаблон:Cite web
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- ↑ Шаблон:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Шаблон:ISBN.
- ↑ Шаблон:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 5 日
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- Английская Википедия
- B-type giants
- Grus (constellation)
- Bayer objects
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Bright Star Catalogue objects
- Stars with proper names
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- Википедия
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