Английская Википедия:Gamma Herculis
Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox image Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end
Gamma Herculis, Latinized from γ Herculis, is a magnitude 3.74 binary star system in the northern constellation of Hercules.[1]
Properties
This is known to be a spectroscopic binary system,[2] although there is no information about the secondary component.[3] Based upon parallax measurements, this system is located at a distance of about Шаблон:Convert from the Earth.[4] The spectrum of the primary star matches a stellar classification of A9III, which indicates this is a giant star that has exhausted the hydrogen at its core and evolved away from the main sequence. The effective temperature is about 7,031 K,[5] giving the star a white hue characteristic of A-type stars.[6] It is rotating rapidly with a projected rotational velocity of Шаблон:Nowrap.[7] The interferometry-measured angular diameter of this star is Шаблон:Nowrap,[8] which, at its estimated distance, equates to a physical radius of about six times the radius of the Sun.[9]
Observations by German astronomer Ernst Zinner in 1929 gave indications that this may be a variable star. It was listed in the New Catalogue of Suspected Variable Stars (1981) with a magnitude range of 3.74 to 3.81. Further observations up to 1991 showed a pattern of small, slow variations with a magnitude variation of 0.05. These appeared to repeat semi-regularly with a period of 183.6 days, although the spectroscopic data presented a longer period of 165.9 days.[10]
Name
It was a member of indigenous Arabic asterism al-Nasaq al-Sha'āmī, "the Northern Line" of al-Nasaqān "the Two Lines",[11] along with β Her (Kornephoros), γ Ser (Zheng, Ching) and β Ser (Chow).[12]
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Sha'āmī or Nasak Shamiya were the title for three stars :β Ser as Nasak Shamiya I, γ Ser as Nasak Shamiya II, γ Her as Nasak Shamiya III (exclude β Her)[13]
In Chinese, Шаблон:Lang (Шаблон:Lang), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of γ Herculis, β Herculis, κ Herculis, γ Serpentis, β Serpentis, δ Serpentis, α Serpentis, ε Serpentis, δ Ophiuchi, ε Ophiuchi and ζ Ophiuchi.[14] Consequently, the Chinese name for γ Herculis itself is Шаблон:Lang (Шаблон:Lang, Шаблон:Lang-en), represent Héjiān (河間), possibly Hejian Kingdom or Hejian Commandery (see Sima Yong, the Prince of Hejian and Liu Wuzhou).[15][16] Héjiān (河間) was westernized into Ho Keen by R.H. Allen, which was the meaning "between the river".[17]
References
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не указан текст - ↑ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
- ↑ 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 6 月 24 日
- ↑ Шаблон:In lang English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Шаблон:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Star Names - R.H.Allen p. 244
- Английская Википедия
- Hercules (constellation)
- Spectroscopic binaries
- Flamsteed objects
- Bayer objects
- A-type giants
- Hipparcos objects
- Semiregular variable stars
- Bright Star Catalogue objects
- Henry Draper Catalogue objects
- Durchmusterung objects
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- Википедия
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