廁增五
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 天兔座 |
| 星官 | 廁（參宿） |
| 赤經 | 06h 06m 09.32339s[1] |
| 赤緯 | −14° 56′ 06.9188″[1] |
| 視星等（V） | 4.67[2] |
| 特性 | |
| 光谱分类 | A0 V[3] |
| U−B 色指数 | +0.00[2] |
| B−V 色指数 | +0.05[2] |
| 天体测定 | |
| 徑向速度 (Rv) | +32.0[4] km/s |
| 自行 (μ) | 赤经：-17.61[1] mas/yr 赤纬：+12.79[1] mas/yr |
| 视差 (π) | 18.88 ± 0.54[1] mas |
| 距离 | 173 ± 5 ly (53 ± 2 pc) |
| 绝对星等 (MV) | +1.05[5] |
| 詳細資料 | |
| 質量 | 2.35±0.03[6] M☉ |
| 表面重力 (log g) | 4.12[7] |
| 亮度 | 41[6] L☉ |
| 溫度 | 10,453±355[7] K |
| 自轉速度 (v sin i) | 246[7] km/s |
| 年齡 | 207[7] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
廁增五（天兔座θ）拉丁化的名字來自θLeporis，是一顆孤獨的恆星[9]。這顆白色的恆星，位於南天星座的天兔座。它的視星等為4.67等[2]，使其明亮到可以用肉眼觀看。基於從地球量測的每年18.88mas的視差[1]，該系統位於距離太陽大約173光年之處。這顆恆星大約在160萬年前最接近太陽，當時它位於太陽的29光年（9.0秒差距）範圍內[10]。
這是一顆普通的A型主序星，恆星分類為A0V[3]， 年齡約2.07億年[7]。它以207公里/秒的投影自轉速度快速旋轉[7]。這使這顆恆星具有扁球的形狀，估計赤道隆起比極半徑大10%[11]。估計它的質量為2.35太陽質量[6]，來自光球的光度是太陽光度的41倍[6]，表面的有效溫度為10,453k[7]。
參考資料
- ^ 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 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ 3.0 3.1 Houk, N., Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor: Dept. of Astronomy, University of Michigan, 1988, Bibcode:1988mcts.book.....H.
- ^ Gontcharov, G. A., Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system, Astronomy Letters, November 2006, 32 (11): 759–771, Bibcode:2006AstL...32..759G, S2CID 119231169, arXiv:1606.08053 , doi:10.1134/S1063773706110065.
- ^ 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.
- ^ 6.0 6.1 6.2 6.3 Zorec, J.; Royer, F., Rotational velocities of A-type stars. IV. Evolution of rotational velocities, Astronomy & Astrophysics, January 2012, 537: A120, Bibcode:2012A&A...537A.120Z, S2CID 55586789, arXiv:1201.2052 , doi:10.1051/0004-6361/201117691.
- ^ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 David, Trevor J.; Hillenbrand, Lynne A., The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets, The Astrophysical Journal, 2015, 804 (2): 146, Bibcode:2015ApJ...804..146D, S2CID 33401607, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
- ^ tet Lep. SIMBAD. 斯特拉斯堡天文資料中心. [2017-08-18].
- ^ 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.
- ^ Bailer-Jones, C. A. L., Close encounters of the stellar kind, Astronomy & Astrophysics, March 2015, 575: 13, Bibcode:2015A&A...575A..35B, S2CID 59039482, arXiv:1412.3648 , doi:10.1051/0004-6361/201425221, A35.
- ^ Belle, G. T., Interferometric observations of rapidly rotating stars, The Astronomy and Astrophysics Review, 2012, 20 (1): 51, Bibcode:2012A&ARv..20...51V, S2CID 119273474, arXiv:1204.2572 , doi:10.1007/s00159-012-0051-2.
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