东海增一
外观
观测资料 历元 J2000 | |
---|---|
星座 | 巨蛇座 |
星官 | |
赤经 | 18h 00m 29.0s[1] [2] |
赤纬 | -03° 41′ 25″[1][2] |
视星等(V) | 4.615[3] |
特性 | |
光谱分类 | F2 V[4] |
U−B 色指数 | −0.002[3] |
B−V 色指数 | +0.386[3] |
天体测定 | |
径向速度 (Rv) | ±0.2 −50.70[5] km/s |
自行 (μ) | 赤经:+155.51[2] mas/yr 赤纬:−44.43[2] mas/yr |
视差 (π) | 42.46 ± 0.34[2] mas |
距离 | 76.8 ± 0.6 ly (23.6 ± 0.2 pc) |
绝对星等 (MV) | 2.70[6] |
详细资料 [1] | |
质量 | ±0.013 1.429M☉ |
半径 | ±0.071 1.961R☉ |
表面重力 (log g) | 4.14[7] |
亮度 | ±0.127 6.251L☉ |
温度 | ±118 6,529K |
金属量 [Fe/H] | −0.12[7] dex |
自转速度 (v sin i) | ±3.5 69.3[6] km/s |
年龄 | ±0.2 2.4Gyr |
其他命名 | |
参考数据库 | |
SIMBAD | 资料 |
东海增一,是拜耳以拉丁字母ζ命名的一颗恒星[9],它是一颗黄白色调的恒星,位于赤道上的巨蛇座。它的视星等为+4.6等,以肉眼就可以看见[3],根据太空探测器依巴谷卫星测量的视差变化42.4毫角秒的周年视差,它与太阳的距离是77光年,而且正以-50.7公里/秒的径向速度接近太阳[5]。估计它会在40万年的时间里,以最接近的近日点距离25.7 ly(7.88 pc)掠过太阳[10]。
东海增一的年龄大约是24亿岁[1],它的光谱类型是F2V [4],表示它是一颗普通的F型主序星。这颗恒星的直径大约是太阳的2倍,质量是1.4倍,来自外大气层的有效温度为6529k,辐射的光度是太阳的6.3倍[1]。它有一个相对较高的旋转速度,显示的投影旋转速度是69公里/秒[6]。
参考资料
[编辑]- ^ 1.0 1.1 1.2 1.3 1.4 Boyajian, Tabetha S.; et al, Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars, The Astrophysical Journal, February 2012, 746 (1): 101, Bibcode:2012ApJ...746..101B, arXiv:1112.3316 , doi:10.1088/0004-637X/746/1/101. See Table 10.
- ^ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2018-05-13]. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. (原始内容存档于2019-03-28). Vizier catalog entry (页面存档备份,存于互联网档案馆)
- ^ 3.0 3.1 3.2 3.3 Kozok, J. R. Photometric observations of emission B-stars in the southern Milky Way. Astronomy and Astrophysics Supplement Series. September 1985, 61: 387–405. Bibcode:1985A&AS...61..387K.
- ^ 4.0 4.1 Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I., The Astronomical Journal, October 2003, 126 (4): 2048–2059, Bibcode:2003AJ....126.2048G, arXiv:astro-ph/0308182 , doi:10.1086/378365
- ^ 5.0 5.1 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. arXiv:1606.08053 . doi:10.1134/S1063773706110065.
- ^ 6.0 6.1 6.2 Reiners, A., Rotation- and temperature-dependence of stellar latitudinal differential rotation, Astronomy and Astrophysics, January 2006, 446 (1): 267–277, Bibcode:2006A&A...446..267R, arXiv:astro-ph/0509399 , doi:10.1051/0004-6361:20053911.
- ^ 7.0 7.1 Balachandran, Suchitra, Lithium depletion and rotation in main-sequence stars, Astrophysical Journal, Part 1, May 1, 1990, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691
- ^ * zet Peg. SIMBAD. 斯特拉斯堡天文资料中心. [2015-10-17].
- ^ Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. 2008, 389 (2): 869–879. Bibcode:2008MNRAS.389..869E. 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. arXiv:1412.3648 . doi:10.1051/0004-6361/201425221. A35.