轩辕增六
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 巨蟹座 |
| 星官 | |
| 赤經 | 08h 56m 56.59711s[1] |
| 赤緯 | +32° 54′ 37.5423″[1] |
| 視星等（V） | +5.436[2] |
| 特性 | |
| 光谱分类 | A7 IV[3] |
| B−V 色指数 | +0.157[2] |
| 天体测定 | |
| 徑向速度 (Rv) | −26.2±0.7[4] km/s |
| 自行 (μ) | 赤经：−53.49[1] mas/yr 赤纬：−66.13[1] mas/yr |
| 视差 (π) | 16.79 ± 0.29[1] mas |
| 距离 | 194 ± 3 ly (60 ± 1 pc) |
| 绝对星等 (MV) | +1.57[5] |
| 詳細資料 | |
| 質量 | 1.79[6] M☉ |
| 表面重力 (log g) | 4.17[6] |
| 亮度 | 21.5[3] L☉ |
| 溫度 | 8,309±283[6] K |
| 自轉速度 (v sin i) | 133[3] km/s |
| 年齡 | 441[6] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
轩辕增六或巨蟹座σ2（英语：σ2 Cancri），又叫巨蟹座59，是位于巨蟹座的一颗孤立[8]白色恒星。用肉眼观察隐约可见它的存在，视星等为+5.44。[2]根据从地球观察到的每年16.79 mas的视差变化，这颗恒星距离太阳约194光年。
这是一颗A型次巨星，恒星分类为A7 IV，[3]估计年龄为4.41亿年。[6]它的自转速度相对较快，预计自转速度为133 K。[3]这颗恒星的质量估计是太阳质量的1.8倍，[6]其光球层的辐射光度是太阳光度的21.5倍，[3]有效温度约为8,309 K。[6]
参考资料
[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, S2CID 18759600, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357.
- ^ 2.0 2.1 2.2 Høg, E.; et al, The Tycho-2 catalogue of the 2.5 million brightest stars, Astronomy and Astrophysics, March 2000, 355: L27–L30, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
- ^ 3.0 3.1 3.2 3.3 3.4 3.5 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.
- ^ 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, S2CID 59451347, 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, S2CID 119257644, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
- ^ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 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.
- ^ [ sig02 Cnc] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. [2017-06-12]. - ^ 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.
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