尾宿增二
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尾宿增二（天蝎座μ2）是一颗位于天蝎座的恒星，其视星等为3.56等，亮度足以用肉眼看到。根据视差测量值，尾宿增二与太阳的距离约为474光年，也是天蝎-半人马星协成员之一[11]。
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 天蝎座 |
| 星官 | |
| 赤经 | 16h 52m 20.14532s[1] |
| 赤纬 | −38° 01′ 03.1258″[1] |
| 视星等（V） | +3.56[2] |
| 特性 | |
| 光谱分类 | B2 IV[3] |
| U−B 色指数 | −0.878[2] |
| B−V 色指数 | −0.219[2] |
| 天体测定 | |
| 径向速度 (Rv) | +1.4[4] km/s |
| 自行 (μ) | 赤经：−11.09[1] mas/yr 赤纬：−23.32[1] mas/yr |
| 视差 (π) | 6.88 ± 0.12[1] mas |
| 距离 | 474 ± 8 ly (145 ± 3 pc) |
| 绝对星等 (MV) | −2.25[5] |
| 详细资料 | |
| 质量 | 8.7±0.2[6] M☉ |
| 半径 | 7.0[7] R☉ |
| 亮度 | 2,385[8] L☉ |
| 温度 | 23,113[7] K |
| 自转速度 (v sin i) | 58[9] km/s |
| 年龄 | 18.5±3.2[6] Myr |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | 资料 |
性质
尾宿增二是一颗蓝白色B型亚巨星，恒星分类为B2 IV[3] 。跟据天文学家估计，它的半径是太阳的7倍，质量几乎是太阳的9倍[6]，光度是太阳的2,385倍[8]。外层大气的有效温度为23,113 K[7]。它大约有1,850万年的历史，并以58公里/秒的速度自转[9]。
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 Gutierrez-Moreno, Adelina; Moreno, Hugo, A photometric investigation of the Scorpio-Centaurus association, Astrophysical Journal Supplement, June 1968, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168.
- ^ 3.0 3.1 Hiltner, W. A.; et al, MK Spectral Types for Bright Southern OB Stars, The Astrophysical Journal, July 1969, 157: 313, Bibcode:1969ApJ...157..313H, doi:10.1086/150069.
- ^ Evans, D. S., Batten, Alan Henry; Heard, John Frederick , 编, The Revision of the General Catalogue of Radial Velocities, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 (University of Toronto: International Astronomical Union), June 20–24, 1966, Bibcode:1967IAUS...30...57E.
- ^ 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 6.2 Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society, 2011, 410: 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x.
- ^ 7.0 7.1 7.2 Underhill, A. B.; et al, Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars, Monthly Notices of the Royal Astronomical Society, November 1979, 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601.
- ^ 8.0 8.1 McDonald, I.; et al, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
- ^ 9.0 9.1 Uesugi, Akira; Fukuda, Ichiro, Catalogue of rotational velocities of the stars, Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), 1970, Bibcode:1970crvs.book.....U.
- ^ mu.02 Sco -- Variable Star, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-09-20], （原始内容存档于2020-11-05）.
- ^ 引用错误：没有为名为
Bobylev2007的参考文献提供内容
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