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Gamma Aquarii
Gamma Aquarii (γ Aqr, γ Aquarii) is the Bayer designation for a star in the constellation Aquarius. It has the traditional name Sadachbia, from an Arabic expression سعد الأخبية ''sa‘d al-’axbiyah'' "luck of the homes (tents)". In Hindi it is also called ''Satabhishaj'' (a hundred physicians); ''Sadhayam'' in Tamil. This star has an apparent visual magnitude of 3.849,〔 making it one of the brighter members of the constellation. Based upon parallax measurements, this star is located at a distance of roughly from the Sun, with an error margin of 5%.〔 The star is a spectroscopic binary with a period of 58.1 days.
In the catalogue of stars in the ''Calendarium of Al Achsasi Al Mouakket'', this star was designated Aoul al Achbiya (أول ألأجبية - ''awwil al ahbiyah''), which was translated into Latin as Prima Tabernaculorum, meaning ''the first of luck of the homes (tents)''.〔 This star, along with π Aqr (Seat), ζ Aqr (Sadaltager / Achr al Achbiya) and η Aqr (Hydria), were al Aḣbiyah (الأخبية), the Tent.〔〔〔γ Aqr as Aoul al Achbiya or Prima Tabernaculorum (the first of luck of the homes or tents), π Aqr as Wasat al Achbiya or Media Tabernaculorum (the middle of luck of the homes or tents) and ζ Aqr as Achr al Achbiya or Postrema Tabernaculorum (the end of luck of the homes or tents). η Aqr should be designated as al Achbiya consistently, but it was not designated as the Arabic name except the name Hydria (Greek) or Deli (Hebrew)〕
In Chinese, (), meaning ''Tomb'', refers to an asterism consisting of γ Aquarii, ζ Aquarii, η Aquarii, π Aquarii.〔 ''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.〕 Consequently, γ Aquarii itself is known as (, (英語:the Second Star of Tomb)).〔 (香港太空館 - 研究資源 - 亮星中英對照表 ), Hong Kong Space Museum. Accessed on line November 23, 2010.〕
Gamma Aquarii is an A-type main sequence star with a stellar classification of A0 V,〔 making it both larger and more massive than the Sun. It is a candidate Lambda Boötis star, suggesting it may have accreted low-metallicity circumstellar gas some time in the past.〔 It is spinning relatively rapidly with a projected rotational velocity of .〔 This value gives a lower bound on the actual azimuthal velocity along the star's equator. The outer atmosphere of Gamma Aquarii is radiating energy at an effective temperature of 10,500 K,〔 which is nearly double the temperature at the surface of the Sun. This heat is what gives Gamma Aquarii the white-hot glow of an A-type star.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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