宗正增二
  | |
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 蛇夫座 |
| 星官 | 宗正（天市垣） |
| 赤經 | 17h 26m 30.8806s[1] |
| 赤緯 | +04° 08′ 25.2876″[1] |
| 視星等（V） | 4.31[2] (4.25 - 4.51[3]) |
| 特性 | |
| 光谱分类 | K2 III[4] |
| U−B 色指数 | +1.57[2] |
| B−V 色指数 | +1.51[2] |
| 变星类型 | 疑似[3] |
| 天体测定 | |
| 徑向速度 (Rv) | −27.81[5] km/s |
| 自行 (μ) | 赤经：+1.459[6] mas/yr 赤纬：+6.760[6] mas/yr |
| 视差 (π) | 3.7578 ± 0.1559[6] mas |
| 距离 | 870 ± 40 ly (270 ± 10 pc) |
| 绝对星等 (MV) | −2.85[7] |
| 詳細資料 | |
| 質量 | 5–9[8] M☉ |
| 半徑 | 100±30[8] R☉ |
| 表面重力 (log g) | 1.3±0.5[8] |
| 亮度 | 2630±894[8] L☉ |
| 溫度 | 4,129±566[8] K |
| 金属量 [Fe/H] | −0.07[9] dex |
| 自轉速度 (v sin i) | 4.2[10] km/s |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
宗正增二（蛇夫座σ），來自「σ Ophiuchi」的拉丁化，是在天球赤道星座蛇夫座的一顆單獨的巨大橘色恆星[11]。它的視星等為4.31等[2]，其亮度足以用肉眼看見微弱的光點。從地球上看，每年3.62mas的視差偏移，提供的距離估計大約900光年。它正以-28公里/秒的徑向速度靠近太陽[5]。
這是一顆K型恆星，已經演化為巨星，其恒星分類為K2 III[4]。維特科夫斯基（Wittkowski）等人（2017）認為它的光度為II-III，表明它位於巨星和超巨星之間的過渡區[8]。它的質量大約是太陽的5到9倍，半徑是太陽的100倍。這顆恆星的在4,130 K的有效溫度下，從其漲大的光球發出的輻射是太陽的2,600倍[8]。
參考文獻
[编辑]- ^ 1.0 1.1 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365
. doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
- ^ 2.0 2.1 2.2 2.3 Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues. 2002, 2237. Bibcode:2002yCat.2237....0D.
- ^ 3.0 3.1 Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1. Bibcode:2009yCat....102025S.
- ^ 4.0 4.1 Houk, N.; Swift, C. Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5. Michigan Spectral Survey. 1999, 05: 0. Bibcode:1999MSS...C05....0H.
- ^ 5.0 5.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Astronomy & Astrophysics. 2005, 430: 165–186. Bibcode:2005A&A...430..165F. S2CID 17804304. arXiv:astro-ph/0409579 . doi:10.1051/0004-6361:20041272.
- ^ 6.0 6.1 6.2 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数
|collaboration=(帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR. - ^ Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015. Vizier catalog entry
- ^ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 Wittkowski, M.; et al, VLTI/AMBER spectro-interferometry of the late-type supergiants V766 Cen (=HR 5171 A), σ Oph, BM Sco, and HD 206859, Astronomy & Astrophysics, January 2017, 597: 16, Bibcode:2017A&A...597A...9W, S2CID 55679854, arXiv:1610.01927 , doi:10.1051/0004-6361/201629349, A9.
- ^ Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas. Precise radial velocities of giant stars. Astronomy & Astrophysics. 2015, 574: A116. Bibcode:2015A&A...574A.116R. S2CID 59334290. arXiv:1412.4634 . doi:10.1051/0004-6361/201322360. hdl:10722/215277. Vizier catalog entry
- ^ De Medeiros, J. R.; Mayor, M. A catalog of rotational and radial velocities for evolved stars. Astronomy and Astrophysics Supplement Series. 1999, 139 (3): 433. Bibcode:1999A&AS..139..433D. arXiv:astro-ph/0608248 . doi:10.1051/aas:1999401. Vizier catalog entry
- ^ Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x .
