人马座KW
人马座KW是一颗位于人马座的红超巨星,距离地球约10000光年。它的直径是太阳的1009倍,是目前已知最大的恒星之一。它的亮度是太阳的36万倍以上,是已知最亮的恒星之一[3]。
观测资料 历元 J2000.0 | |
---|---|
星座 | 人马座 |
星官 | |
赤经 | 17h 52m 00.7257s[1] |
赤纬 | −28° 01′ 20.562″[1] |
视星等(V) | 8.983 (v)[1] 8.5 - 11 (AAVSO) 11.0 - 13.2 (p)[2] |
特性 | |
光谱分类 | M1.5Iab:[1] |
B−V 色指数 | 2.5[1] |
变星类型 | 半规则变星[2] |
详细资料 | |
半径 | 1,009[3] R☉ |
表面重力 (log g) | −0.5[3] |
亮度 (bolometric) | 360,000[3] L☉ |
温度 | 3,700[3] K |
天体测定 | |
自行 (μ) | 赤经:−1.11[1] mas/yr 赤纬:−1.76[1] mas/yr |
距离 | ~10,000[4][5] ly (~3,000[4][5] pc) |
其他命名 | |
参考资料库 | |
SIMBAD | 资料 |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/KW-Sgr-Lightcurve-AAVSO.gif/400px-KW-Sgr-Lightcurve-AAVSO.gif)
参见
编辑外部链接
编辑参考资料
编辑- ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 V* KW Sgr -- Semi-regular pulsating Star, database entry, SIMBAD. Accessed on line November 10, 2010.
- ^ 2.0 2.1 KW Sgr, 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 10, 2010. (Quick look: KW+Sgr)
- ^ 3.0 3.1 3.2 3.3 3.4 Table 4, Levesque et al. 2005, using Mbol = −9.15 for KW Sagittarii (see the table) and 4.74 for the Sun (p. 982.)
- ^ 4.0 4.1 KW Sagittarii is in the Sgr OB5 association, which has an estimated distance modulus of 12.4. See Tables 1 and 2, Levesque et al. 2005.
- ^ 5.0 5.1 "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.