天鵝座KY

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天鹅座KY
KY Cygni
觀測資料
曆元 J2000.0
星座 天鹅座
星官
赤經 20h 25m 58.05s[1]
赤緯 +38° 21′ 07.6″[1]
視星等(V) 10.77[1]
特性
光谱分类 M3.5Ia[1]
B−V 色指数 2.8[1]
变星类型 不规则变星[2]
詳細資料
質量 25[3] M
半徑 1,420–2,850[4] R
表面重力 (log g) −1.0 - −0.5[4]
亮度 (bolometric) 270,000–1,100,000[4] L
溫度 3,500[4] K
天体测定
距离 ~5,000[5][6] ly
(~1,600[5][6] pc)
其他命名
KY Cyg, AN 339.1929, IRAS 20241+3811, IRC +40415, LEE 220, RAFGL 2575.
參考資料庫
SIMBAD data
天鵝座KY和參宿四體積比較

天鹅座KY是一颗位于天鹅座红超巨星。它是目前已知最大的恒星之一,直径是太阳的1420倍以上。它也是已知最亮的恒星之一,亮度是太阳的30万倍以上。天鹅座KY距离地球大约5000光年

参见[编辑]

参考资料[编辑]

  1. ^ 1.0 1.1 1.2 1.3 1.4 V* KY Cyg -- Pulsating variable Star, database entry, SIMBAD. Accessed on line November 12, 2010.
  2. ^ KY Cyg, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 12, 2010.
  3. ^ List of Largest Stars Gets 3 New Chart Toppers, Robert Roy Britt, space.com, 10 January 2005. Accessed on line November 12, 2010.
  4. ^ 4.0 4.1 4.2 4.3 Table 4, Levesque et al. 2005, using Mbol = −10.36/−8.84 for KY Cygni (see the table) and 4.74 for the Sun (p. 982.)
  5. ^ 5.0 5.1 KY Cygni is in the Cyg OB1 association, which has an adopted estimated distance modulus of 11.0. See Tables 1 and 2, Levesque et al. 2005.
  6. ^ 6.0 6.1 "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought", Emily M. Levesque, Philip Massey, K. A. G. Olsen, Bertrand Plez, Eric Josselin, Andre Maeder, and Georges Meynet, The Astrophysical Journal 628, #2 (August 2005), pp. 973-985, doi:10.1086/430901, Bibcode: 2005ApJ...628..973L.