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Lambda Boötis (λ Boo, λ Boötis) is a star in the constellation Boötes. Lambda Boötis is a white A-type main sequence dwarf with an apparent magnitude of +4.18. It is approximately 97.1 light-years from Earth. Lambda Boötis is the prototype of a group of rare stars known as Lambda Boötis stars, all of which are dwarf stars with unusually low abundances of metals in their spectra. Its diameter has been directly measured to be 1.7 times that of the Sun. ==Name== This star, along with the ''Aselli'' (θ Boo, ι Boo and κ Boo), were Al Aulād al Dhiʼbah (ألعولد ألذعب - ''al aulād al dhiʼb''), "the Whelps of the Hyenas". ''Al Aulād al Dhiʼbah'' or Aulad al Thiba was the title of this star in the catalogue of stars in ''Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars''.〔(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 )〕 In Chinese astronomy, Lambda Boötis is called 玄戈, Pinyin: Xuángē, meaning ''Sombre Lance'', because this star is marking itself and stand alone in ''Sombre Lance'' asterism, Purple Forbidden enclosure (see : Chinese constellation).〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 14 日 )〕 玄戈 (Xuángē) westernized into Heuen Ko, but the name ''Heuen Ko'' was designated for γ Boötis (Seginus) by R.H. Allen, with the meaning is "the heavenly spear" 〔(Richard Hinckley Allen: Star Names — Their Lore and Meaning: Boötes )〕 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「Lambda Boötis」の詳細全文を読む スポンサード リンク
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