天鵝座ω2
| 观测资料 历元 J2000.0 | |
|---|---|
| 星座 | 天鹅座 |
| 星官 | 天津（女宿） |
| 赤经 | 20h 31m 18.81663s[1] |
| 赤纬 | +49° 13′ 13.0656″[1] |
| 视星等（V） | 5.5292±0.0013[2] |
| 特性 | |
| 光谱分类 | M2 III[3] |
| 天体测定 | |
| 径向速度 (Rv) | −64.15±0.20[2] km/s |
| 自行 (μ) | 赤经：+9.21[1] mas/yr 赤纬：−31.88[1] mas/yr |
| 视差 (π) | 8.17 ± 0.19[1] mas |
| 距离 | 399 ± 9 ly (122 ± 3 pc) |
| 绝对星等 (MV) | +0.00[4] |
| 详细资料 | |
| 亮度 | 301[5] L☉ |
| 温度 | 3,847[5] K |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | 资料 |
天鹅座ω2，来自拉丁化的ω2 Cygni，是独立的拜耳名称[7]，它是在北天星座天鹅座的一颗恒星；中文传统名称是天津增卅四。它的视星等为5.5等[2]，在一个黑暗的夜晚，肉眼隐约可见。基于周年8.17mas的视差偏移[1]，它位于距离太阳大约399光年的地方。在这个距离上，由于星际尘埃的消光，视星等减少了0.08等[2]。
它是在渐近巨星支的一颗红巨星，恒星分类为M2III[3]。尽管证据被认为是“可疑或错误的”，它仍是一颗可疑的变星。如果它确实是变星，其变异性很小，振幅为0.05等，时间尺度约为30天[8]。这颗恒星有58.3%的几率是武仙座星流的成员[2]。
相关条目
[编辑]- 天津增卅五（天鹅座ω1）
参考资料
[编辑]- ^ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357.
- ^ 2.0 2.1 2.2 2.3 2.4 Famaey, B.; et al, Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters, Astronomy and Astrophysics, January 2005, 430 (1): 165–186, Bibcode:2005A&A...430..165F, S2CID 17804304, arXiv:astro-ph/0409579 , doi:10.1051/0004-6361:20041272.
- ^ 3.0 3.1 Eggen, Olin J., Asymptotic giant branch stars near the sun, Astronomical Journal, July 1992, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
- ^ 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.
- ^ 5.0 5.1 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, S2CID 118665352, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
- ^ [ ome02 Cyg] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. - ^ 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.
- ^ Percy, John R.; Fleming, David E. B., A photometric survey of suspected small-amplitude red variables, Publications of the Astronomical Society of the Pacific, February 1992, 104: 96–100, Bibcode:1992PASP..104...96P, doi:10.1086/132963 .
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