仙王座V354
| 观测资料 历元 J2000.0 | |
|---|---|
| 星座 | 仙王座 |
| 星官 | |
| 赤经 | 22h 33m 34.64s[1] |
| 赤纬 | +58° 53′ 47.1″[1] |
| 视星等（V） | 10.82 to 11.35[2] |
| 特性 | |
| 光谱分类 | M2.5Iab:[1] |
| B−V 色指数 | 2.8[1] |
| 变星类型 | 不规则变星[2] |
| 详细资料 | |
| 半径 | 1520[3] R☉ |
| 表面重力 (log g) | −0.5[3] |
| 亮度 (bolometric) | 370,000[3] L☉ |
| 温度 | 3650[3] K |
| 天体测定 | |
| 距离 | ~9,000[4][5] ly (~3,000[4][5] pc) |
| 其他命名 | |
V354 Cep.
| |
| 参考数据库 | |
| SIMBAD | 资料 |
仙王座V354（V354 Cephei）是银河系中的一颗红超巨星，属于不规则变星，距离地球约 9,000 光年。
仙王座V354是目前已知最大的恒星之一，其半径约是太阳的1520倍，或 10.6 亿公里[3]。如果该值正确的话，假如将该恒星放在太阳系的中心，其半径将达到 7 天文单位，在木星和土星轨道之间。这颗恒星总辐射能量约为太阳的30万倍，属于极端亮的红超巨星。但是也有科学家认为这个恒星的实际大小要小得多，可能只有690个太阳半径。亮度约为太阳的8万倍
参见
参考资料
- ^ 1.0 1.1 1.2 1.3 V* V354 Cep -- Pulsating variable Star, database entry, SIMBAD. Accessed on line November 12, 2010.
- ^ 2.0 2.1 V354 Cep, 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.
- ^ 3.0 3.1 3.2 3.3 3.4 Table 4, Levesque et al. 2005, using Mbol = −9.17 for V354 Cephei (see the table) and 4.74 for the Sun (p. 982.)
- ^ 4.0 4.1 V354 Cephei is in the Cep OB1 association, which has an adopted estimated distance modulus of 12.2. 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.
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