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Beta Arae
Beta Arae (β Ara, β Arae) is the brightest star in the constellation Ara, with an apparent visual magnitude of 2.8.〔 Parallax measurements place it at a distance of roughly from Earth.〔
The spectrum of this star matches a stellar classification of K3 Ib-IIa,〔 with the luminosity class notation 'Ib-IIa' indicating that the star lies part way between a higher luminosity bright giant (IIa) and a lower luminosity supergiant (Ib). This represents two of the evolutionary stages that a massive star passes through after it has exhausted the hydrogen at its core. Beta Arae is radiating energy from its outer envelope at an effective temperature of 4,582 K,〔 which causes it to take on the orange hue of a K-type star.〔 This enlarged star appears to be rotating slowly with a projected rotational velocity of about .〔 The abundance of elements other than hydrogen and helium, what astronomer term the star's metallicity, is more than three times the abundance in the Sun.〔〔
Rarely, this star is called by the name Vasat-ül-cemre in Turkish spelling, derived from Arabic word ﻭﺳﻂ ''(wasath)'' and ﺟﻤﻩﺮ ''(khamra)'', meaning "middle of fire".〔 (YILDIZ ADLARI SÖZLÜĞÜ - Mustafa Pultar (Vasat-ül-cemre) )〕 In Chinese, (), meaning ''Pestle'', refers to an asterism consisting of β Arae, σ Arae and α Arae.〔 ''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, β Arae itself is known as (, (英語:the Third Star of Pestle).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 1 日 )〕
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Beta Arae」の詳細全文を読む
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