杵增一 (箕宿)
  | |
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 天壇座[1] |
| 星官 | 杵（箕宿） |
| 赤經 | 18h 06m 37.871s[2] |
| 赤緯 | −50° 05′ 29.31″[2] |
| 視星等（V） | +3.67[3] |
| 特性 | |
| 光谱分类 | B2 Ib[4] |
| U−B 色指数 | −0.870[3] |
| B−V 色指数 | −0.109[3] |
| 天体测定 | |
| 徑向速度 (Rv) | +3.4[5] km/s |
| 自行 (μ) | 赤经：−8.27 mas/yr 赤纬：−8.70 mas/yr |
| 视差 (π) | 4.01 ± 0.15[2] mas |
| 距离 | 810 ± 30 ly (249 ± 9 pc) |
| 绝对星等 (MV) | −3.33[1] |
| 詳細資料 | |
| 質量 | 8.9+0.1 −[6] M☉ |
| 半徑 | 20.1[7] R☉ |
| 表面重力 (log g) | 2.70[8] |
| 亮度 | 3,450[1] L☉ |
| 溫度 | 17,231+231 −[7] K |
| 自轉速度 (v sin i) | 95[9] km/s |
| 年齡 | 28.2+4.7 −[6] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
杵增一（Theta Arae）是在星座天壇座的一顆恆星。它的拜耳名稱，即拉丁化後的名稱為θ Arae，縮寫為θ Ara或Theta Ara。這顆恆星的視星等為 +3.67[3]，亮度足以用肉眼看見。基於移動4.01mas的周年視差[2]，杵增一與地球的距離為810光年（250秒差距）。
這是一顆恆星分類為B2Ib的超巨星[4]。年齡2,800萬年[6]，它具有高旋傳速率，投影旋轉速度為95公里/秒[9]。這顆恆星的質量將近9太陽質量[6]，半徑超過20太陽半徑[7]。這顆恆星外層大氣的有效溫度為17,231K[7]，比太陽表面熱得多。在這種溫度下，恆星會發出B型恆星特有的藍白色光澤[11]。
參考文獻
[编辑]- ^ 1.0 1.1 1.2 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.
- ^ 2.0 2.1 2.2 2.3 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
- ^ 3.0 3.1 3.2 3.3 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 .
- ^ 4.0 4.1 Houk, Nancy, Michigan catalogue of two-dimensional spectral types for the HD stars 2, Ann Arbor: Dept. of Astronomy, University of Michigan, 1978, Bibcode:1978mcts.book.....H.
- ^ Wielen, R.; et al, Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg (Astronomisches Rechen-Institut Heidelberg), 1999, 35 (35): 1, Bibcode:1999VeARI..35....1W.
- ^ 6.0 6.1 6.2 6.3 Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society, January 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, S2CID 118629873, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x .
- ^ 7.0 7.1 7.2 7.3 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 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601 .
- ^ Fraser, M.; et al, Atmospheric parameters and rotational velocities for a sample of Galactic B-type supergiants, Monthly Notices of the Royal Astronomical Society, May 2010, 404 (3): 1306–1320, Bibcode:2010MNRAS.404.1306F, S2CID 118674151, arXiv:1001.3337 , doi:10.1111/j.1365-2966.2010.16392.x .
- ^ 9.0 9.1 Bernacca, P. L.; Perinotto, M., A catalogue of stellar rotational velocities, Contributi Osservatorio Astronomico di Padova in Asiago, 1970, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
- ^ * tet Ara. SIMBAD. 斯特拉斯堡天文資料中心. [2010-07-30].
- ^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始内容存档于2013-12-03）.
