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Lambda Aquarii
Lambda Aquarii (λ Aqr, λ Aquarii) is the Bayer designation for a star in the equatorial constellation of Aquarius. It has the obscure traditional names Hydor and Ekkhysis, from the ancient Greek ὕδωρ "water" and ἔκχυσις "outpouring". The apparent visual magnitude of this star is 3.722,〔 which is bright enough to be visible with the naked eye. It is roughly from Earth.〔
In Chinese, (), meaning ''Line of Ramparts'', refers to an asterism consisting of λ Aquarii, κ Capricorni, ε Capricorni, γ Capricorni, δ Capricorni, ι Aquarii, σ Aquarii, φ Aquarii, 27 Piscium, 29 Piscium, 33 Piscium and 30 Piscium.〔 ''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, λ Aquarii itself is known as (, (英語:the Seventh Star of Line of Ramparts).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 )〕
Lambda Aquarii is a red giant star with a stellar classification of M2.5 III.〔 It is a semiregular variable star star with pulsation periods of 24.5, 32.0, and 49.5 days.〔 This star is on the asymptotic giant branch and is generating energy through the nuclear fusion of hydrogen and helium along concentric shells surrounding an inert core of carbon and oxygen.〔
==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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