西上将
西上将（σ Leo / 狮子座σ）也称太微右垣二，是狮子座的一颗蓝白恒星，在中国古代星官中属于太微垣的太微右垣。它视星等为+4.05，是狮子座的第四亮星，光谱型B9.5V。
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 狮子座 |
| 星官 | |
| 赤经 | 11h 21m 08.1943s[1] |
| 赤纬 | +06° 01′ 45.558″[1] |
| 视星等（V） | 4.046[2] |
| 特性 | |
| 光谱分类 | B9.5 Vs[3] |
| U−B 色指数 | –0.12[4] |
| B−V 色指数 | –0.06[4] |
| 天体测定 | |
| 径向速度 (Rv) | –5.3[5] km/s |
| 自行 (μ) | 赤经：–91.76[1] mas/yr 赤纬：–12.83[1] mas/yr |
| 视差 (π) | 15.24 ± 0.81[1] mas |
| 距离 | 210 ± 10 ly (66 ± 3 pc) |
| 绝对星等 (MV) | −0.10[6] |
| 详细资料 | |
| 质量 | 2.76[7] M☉ |
| 半径 | 3.3[8] R☉ |
| 表面重力 (log g) | 3.83±0.03[9] |
| 亮度 | 133[6] L☉ |
| 温度 | 10,250[8] K |
| 金属量 [Fe/H] | +0.0[8] dex |
| 自转速度 (v sin i) | 70[10] km/s |
| 年龄 | 293[7] Myr |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | 资料 |
参考文献
- ^ 1.0 1.1 1.2 1.3 1.4 Perryman, M. A. C.; et al. The HIPPARCOS Catalogue. Astronomy & Astrophysics. April 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ Cousins, A. W. J., Standardisation of broad band photometry of equatorial standards, South Africa Astronomical Observatory Circular, 1984, 8: 59−67, Bibcode:1984SAAOC...8...59C.
- ^ Chini, R.; et al, spectroscopic survey on the multiplicity of high-mass stars, Monthly Notices of the Royal Astronomical Society, August 2012, 424 (3): 1925−1929, Bibcode:2012MNRAS.424.1925C, arXiv:1205.5238
, doi:10.1111/j.1365-2966.2012.21317.x
- ^ 4.0 4.1 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. UBVRIJKL photometry of the bright stars. Communications of the Lunar and Planetary Laboratory. 1966, 4 (99). Bibcode:1966CoLPL...4...99J.
- ^ Wilson, Ralph Elmer. General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. 1953. Bibcode:1953GCRV..C......0W.
- ^ 6.0 6.1 Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
- ^ 7.0 7.1 David, Trevor J.; Hillenbrand, Lynne A., The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets, The Astrophysical Journal, 2015, 804 (2): 146, Bibcode:2015ApJ...804..146D, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
- ^ 8.0 8.1 8.2 Lipski, Ł.; Stȩpień, K. Effective temperatures of magnetic chemically peculiar stars from full spectral energy distributions. Monthly Notices of the Royal Astronomical Society. March 2008, 385 (1): 481–492. Bibcode:2008MNRAS.385..481L. arXiv:0712.3664 . doi:10.1111/j.1365-2966.2008.12856.x.
- ^ Fitzpatrick, E. L.; Massa, D., Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry, The Astronomical Journal, March 2005, 129 (3): 1642–1662, Bibcode:2005AJ....129.1642F, arXiv:astro-ph/0412542 , doi:10.1086/427855
- ^ Bernacca, P. L.; Perinotto, M. A catalogue of stellar rotational velocities. Contributi Osservatorio Astronomico di Padova in Asiago. 1970, 239 (1). Bibcode:1970CoAsi.239....1B.
- ^ sig Leo -- Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-06-23]. （原始内容存档于2016-03-04）.
