Английская Википедия:Beta Crateris

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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 Beta Crateris, Latinized from β Crateris, is a binary star[1] system in the southern constellation of Crater. It is visible to the naked eye with an apparent visual magnitude of 4.46.[2] Based upon an annual parallax shift of 9.59 mas as seen from Earth, it is located around 340 light years from the Sun.

This is an astrometric binary[3] star system with an orbital period of 6.0 years and a projected separation of 8.3 AU. The orbit has an estimated semimajor axis of 9.3 AU.[1] The primary, component A, is listed as an A-type giant star with a stellar classification of A2 III.[1][3][4] However, Houk and Smith-Moore (1988) give a main sequence classification of A1 V,[5] while Abt and Morrell (1995) list it as a subgiant star with a class of A2 IV.[6] The spectrum shows enhanced barium, possibly as a result of a previous mass transfer event.[7]

The companion, component B, is a white dwarf[4] of class DA with an effective temperature of 36,885 K that has been cooling down for around four million years.[8] It has an unusually low mass, 43% that of the Sun, suggesting that the white dwarf progenitor may have transferred matter to its companion. Alternative scenarios require either the evolution of a triple star system, or a binary system with highly eccentric orbit resulting in grazing interactions.[1] The dwarf is a source of X-ray emission.[9]

Name

This star was one of the set assigned by the 16th century astronomer Al Tizini[10] to Al Sharāsīf (ألشراسيف), the Ribs (of Hydra), which included the stars from β Crateris westward through κ Hydrae.[11][12]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Sharāsīf were the title for two stars : β Crateris as Al Sharasīf II and κ Hydrae as Al Sharasīf I.[13]

In Chinese, Шаблон:Lang (Шаблон:Lang), meaning Wings (asterism), refers to an asterism consisting of β Crateris, α Crateris, γ Crateris, ζ Crateris, λ Crateris, ν Hydrae, η Crateris, δ Crateris, ι Crateris, κ Crateris, ε Crateris, HD 95808, HD 93833, θ Crateris, HD 102574, HD 100219, HD 99922, HD 100307, HD 96819, χ1 Hydrae, HD 102620 and HD 103462.[14] Consequently, β Crateris itself is known as Шаблон:Lang (Шаблон:Lang, Шаблон:Lang-en.)[15][16]

References

Шаблон:Reflist

External links

Шаблон:Stars of Crater

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  1. ↑ 1,0 1,1 1,2 1,3 Ошибка цитирования Неверный тег <ref>; для сносок Holberg2013 не указан текст
  2. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mermilliod1986 не указан текст
  3. ↑ 3,0 3,1 Ошибка цитирования Неверный тег <ref>; для сносок Eggleton2008 не указан текст
  4. ↑ 4,0 4,1 Ошибка цитирования Неверный тег <ref>; для сносок Burleigh2001 не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок houk1978 не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок abt1995 не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Smalley1997 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Barstow2014 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Schroeder2007 не указан текст
  10. ↑ Шаблон:Cite web
  11. ↑ Star Names - R.H.Allen p. 182
  12. ↑ Star Names - R.H.Allen p. 246
  13. ↑ Шаблон:Citation
  14. ↑ 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.
  15. ↑ Шаблон:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 31 日
  16. ↑ Шаблон:In lang 夢之大地 @ 國立成功大學 WebBBS DreamLand @ National Cheng Kung University WebBBS System
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