西次相
（重定向自太微右垣四）
 | |
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 狮子座 |
| 星官 | |
| 赤經 | 11h 14m 14.40446s[1] |
| 赤緯 | +15° 25′ 46.4541″[1] |
| 視星等（V） | +3.324[2] |
| 特性 | |
| 光谱分类 | A2 V[3] |
| U−B 色指数 | +0.07[2] |
| B−V 色指数 | –0.02[2] |
| 天体测定 | |
| 徑向速度 (Rv) | +7.6[4] km/s |
| 自行 (μ) | 赤经：-60.31[1] mas/yr 赤纬：-79.10[1] mas/yr |
| 视差 (π) | 19.76 ± 0.17[1] mas |
| 距离 | 165 ± 1 ly (50.6 ± 0.4 pc) |
| 绝对星等 (MV) | −0.19[5] |
| 詳細資料 | |
| 質量 | 2.5[6] M☉ |
| 表面重力 (log g) | 3.65[7] |
| 亮度 | 141[6] L☉ |
| 溫度 | 9,350[7] K |
| 金属量 [Fe/H] | +0.05[7] dex |
| 自轉速度 (v sin i) | 23[8] km/s |
| 年齡 | 550[7] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
西次相 (θ Leo / 狮子座θ)是狮子座的一颗恒星，也称太微右垣四，西次相的光谱型为A0，视星等为+3.4。距离地球170光年。
参考文献
- ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357
- ^ 2.0 2.1 2.2 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99), Bibcode:1966CoLPL...4...99J
- ^ Cowley, A.; et al, A study of the bright A stars. I. A catalogue of spectral classifications, Astronomical Journal, April 1969, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
- ^ Wielen, R.; et al, Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, 1999, Bibcode:1999VeARI..35....1W
- ^ 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.
- ^ 6.0 6.1 Wyatt, M. C.; et al, Steady State Evolution of Debris Disks around A Stars, The Astrophysical Journal, July 2007, 663 (1): 365–382, Bibcode:2007ApJ...663..365W, arXiv:astro-ph/0703608 , doi:10.1086/518404
- ^ 7.0 7.1 7.2 7.3 Smith, K. C.; Dworetsky, M. M., Elemental Abundances in Normal Late B-Stars and Hgmn-Stars from Co-Added IUE Spectra - Part One - Iron Peak Elements, Astronomy and Astrophysics, 1993, 274 (2): 335, Bibcode:1993A&A...274..335S
- ^ Royer, F.; Zorec, J.; Gómez, A. E., Rotational velocities of A-type stars. III. Velocity distributions, Astronomy and Astrophysics, February 2007, 463 (2): 671–682, Bibcode:2007A&A...463..671R, arXiv:astro-ph/0610785 , doi:10.1051/0004-6361:20065224
- ^ tet Leo -- Variable Star, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-02-11], （原始内容存档于2020-11-05）
