巨爵座β
巨爵座β（β Crt，翼宿十六，Al Sharasif），是位于巨爵座南部的一个双星系统。它在夜空中肉眼可见，视星等为4.46[2]。 从地球上测量的恒星视差为9.59毫角秒，因此巨爵座β与太阳的距离约为340光年。
  | |
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 巨爵座 |
| 星官 | |
| 赤經 | 11h 11m 39.48783s[1] |
| 赤緯 | −22° 49′ 33.0593″[1] |
| 視星等（V） | 4.46[2] (4.61 + 13.40)[3] |
| 特性 | |
| 光谱分类 | A2 III[3] + DA1.4[3] |
| U−B 色指数 | +0.05[2] |
| B−V 色指数 | +0.02[2] |
| 天体测定 | |
| 徑向速度 (Rv) | +5.6±0.5[4] km/s |
| 自行 (μ) | 赤经：+2.52[1] mas/yr 赤纬：−100.22[1] mas/yr |
| 视差 (π) | 9.59 ± 0.66[1] mas |
| 距离 | 340 ± 20 ly (104 ± 7 pc) |
| 绝对星等 (MV) | −0.62[5] + 8.19[3] |
| 詳細資料 | |
| 表面重力 (log g) | 3.5[6] |
| 亮度 | 147[7] L☉ |
| 溫度 | 8,830[7] K |
| 自轉速度 (v sin i) | 49[8] km/s |
| β Crt B | |
| 質量 | 0.43[9] M☉ |
| 半徑 | 0.027[3] R☉ |
| 表面重力 (log g) | 7.40[10] |
| 溫度 | 36,885[10] K |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
巨爵座β是一个天测联星[3]系统，轨道周期约为6年，距离为8.3个天文单位。该轨道预计半长轴为9.3个天文单位[3]。 其主星A被列为一颗恒星光谱为A2 Ⅲ型的A型巨星。[3][12][9] 不过Houk 和 Smith-Moore (1988) 把它列为A1 Ⅴ型主序星，[13] 而Abt 和 Morrell (1995) 则把它列为一颗A2 Ⅳ型亚巨星[14]。 该系统的光谱显示为钡增强，可能是因为其曾发生过传质过程[6]。
伴星B是一颗白矮星[9]，有效温度为36,885K，已经冷却了约400万年[10]。 它具有异常低的质量，只有太阳的43%，这表明这颗伴星可能已经将质量转移给了主星。预测其将来可能转化为一个三星系统 ，或者是一个高轨道离心率的双星系统[3]。 同时，这颗矮星是该系统X射线辐射的来源[15]。
参考来源 编辑
- ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 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- ^ 2.0 2.1 2.2 2.3 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV data (SIMBAD), 1986, Bibcode:1986EgUBV........0M.
- ^ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Holberg, J. B.; et al, Where are all the Sirius-like binary systems?, Monthly Notices of the Royal Astronomical Society, 2013, 435 (3): 2077, Bibcode:2013MNRAS.435.2077H, arXiv:1307.8047 , doi:10.1093/mnras/stt1433.
- ^ de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.
- ^ 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 Smalley, B.; et al, The chemical composition and binarity of beta Crateris, Monthly Notices of the Royal Astronomical Society, January 1997, 284 (2): 457–464, Bibcode:1997MNRAS.284..457S, doi:10.1093/mnras/284.2.457.
- ^ 7.0 7.1 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.
- ^ Royer, F.; et al, Rotational velocities of A-type stars. III. Velocity distributions, Astronomy and Astrophysics, February 2007, 463 (2): 671–682, Bibcode:2007A&A...463..671R, arXiv:astro-ph/0610785 , doi:10.1051/0004-6361:20065224.
- ^ 9.0 9.1 9.2 Burleigh, M. R.; et al, The low-mass white dwarf companion to β Crateris, Monthly Notices of the Royal Astronomical Society, November 2001, 327 (4): 1158–1164, Bibcode:2001MNRAS.327.1158B, arXiv:astro-ph/0106463 , doi:10.1046/j.1365-8711.2001.04818.x.
- ^ 10.0 10.1 10.2 Barstow, M. A.; et al, Evidence for an external origin of heavy elements in hot DA white dwarfs, Monthly Notices of the Royal Astronomical Society, May 2014, 440 (2): 1607–1625, Bibcode:2014MNRAS.440.1607B, arXiv:1402.2164 , doi:10.1093/mnras/stu216.
- ^ bet Crt -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2017-03-02], （原始内容存档于2020-11-05）.
- ^ 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, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
- ^ Houk, Nancy; Smith-Moore, M., Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor: Dept. of Astronomy, University of Michigan, 1978, Bibcode:1988MSS...C04....0H.
- ^ Abt, Helmut A.; Morrell, Nidia I., The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars, Astrophysical Journal Supplement, 1995, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
- ^ Schröder, C.; Schmitt, J. H. M. M., X-ray emission from A-type stars, Astronomy and Astrophysics, November 2007, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
外部链接 编辑
- Kaler, James B., Beta Crateris, Stars (University of Illinois), 2015-05-22 [2017-03-03], （原始内容存档于2016-11-04）.