翻訳と辞書 Words near each other ・ GX Logic Modeler ・ GX Velorum ・ GX WebManager Community Edition ・ GXA ・ GXemul ・ GXF ・ GXG Markets ・ GXL ・ GXMO ・ GXP ・ GxP ・ GXS (disambiguation) ・ GXS Inc. ・ GXT ・ Gy ・ GY Andromedae ・ GY postcode area ・ Gy Waldron ・ Gy's sampling theory ・ Gy, Haute-Saône ・ Gy, Switzerland ・ Gy-en-Sologne ・ Gy-l'Évêque ・ Gy-les-Nonains ・ GY6 engine ・ Gya (disambiguation) ・ Gya'gya ・ Gya'nyima ・ Gyaaman ・ Gyablung Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク GY Andromedae ： ウィキペディア英語版 GY Andromedae GY Andromedae (GY And) is an α2 Canum Venaticorum type variable star in the northern constellation Andromeda. Its brightness fluctuates in visual magnitude between 6.27m and 6.41m, making it a challenge to view with the naked eye even in good seeing conditions. The magnetic activity on this star shows an unusually long period of variability, cycling about once every 23 years.〔 Based upon parallax measurements, this star is located at a distance of about from the Earth.〔 This is classified as an Ap/Bp star, with a peculiar spectrum〔 showing lines of chromium and europium that change in intensity over a period matching the variability cycle, although opposite in phase.〔 Its most striking characteristic is the presence of the unstable element promethium in its emission spectrum. All isotopes of this element are radioactive with half lives of 17.7 years or less. The promethium in the outer envelope may be generated by the spontaneous fission of higher mass transuranic elements.〔 In 1958, American astronomer Horace W. Babcock discovered that this is a spectroscopic binary star. It has an orbital period of 273 days with a large eccentricity of 0.47. The two components are separated by an estimated distance of at least , or 0.25 Astronomical Units.〔 ==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「GY Andromedae」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.