水位一
水位一（小犬6 ，6 Canis Minoris）是赤道星座小犬座的一颗恒星，距离太阳大约570光年。它是一颗肉眼可见，黯淡的橙色恒星，视星等为+4.55等[2]。这颗恒星正以日心点运动学−16.3 km/s 径向速度向地球靠近[4]，它是属于天狼星超星系团的大熊座星流周边一个群的成员[9]
| 观测资料 历元 J2000.0 (ICRS) | |
|---|---|
| 星座 | 小犬座 |
| 星官 | 水位（井宿） |
| 赤经 | 07h 29m 47.78172s[1] |
| 赤纬 | +12° 00′ 23.6347″[1] |
| 视星等（V） | +4.55[2] |
| 特性 | |
| 演化阶段 | 巨星 |
| 光谱分类 | K1 III[3] |
| B−V 色指数 | 1.276±0.001[2] |
| 天体测定 | |
| 径向速度 (Rv) | −16.31±0.13[4] km/s |
| 自行 (μ) | 赤经：−0.57[1] mas/yr 赤纬：−18.85[1] mas/yr |
| 视差 (π) | 5.70 ± 0.21[1] mas |
| 距离 | 570 ± 20 ly (175 ± 6 pc) |
| 绝对星等 (MV) | −1.67[2] |
| 详细资料 | |
| 质量 | 4.0[5] M☉ |
| 半径 | 44[6] R☉ |
| 亮度 | 761.44[2] L☉ |
| 温度 | 4,370[5] K |
| 金属量 [Fe/H] | 0.02[5] dex |
| 自转速度 (v sin i) | 1.7[7] km/s |
| 其他命名 | |
| 参考资料库 | |
| SIMBAD | 资料 |
这是一颗演化的巨星，恒星分类为K1 III.[3]。它有轻度的钡异常[10]，这可能表明这是一颗有白矮星伴星的联星系统[11]。对可见分量的干涉量测-量测的角直径约为2.31±0.03 mas[12]，估计其距离相当于约44倍太阳半径的物理半径[6]。质量约为4 太阳质量[5]，在4,370k的有效温度下[5]，其扩大光球的辐射为太阳的761倍[2]。
参考资料
- ^ 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 2.3 2.4 2.5 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.
- ^ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C., The Perkins catalog of revised MK types for the cooler stars, Astrophysical Journal Supplement Series, 1989, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ 4.0 4.1 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
- ^ 5.0 5.1 5.2 5.3 5.4 Gondoin, P., Evolution of X-ray activity and rotation on G-K giants, Astronomy and Astrophysics, December 1999, 352: 217–227, Bibcode:1999A&A...352..217G.
- ^ 6.0 6.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2023-12-20], ISBN 3-540-29692-1, （原始内容存档于2023-07-28）. The radius (R*) is given by:
- ^ De Medeiros, J. R.; et al, Rotation and lithium in single giant stars, Astronomy and Astrophysics, November 2000, 363: 239–243, Bibcode:2000A&A...363..239D, arXiv:astro-ph/0010273 .
- ^ 6 CMi. SIMBAD. 斯特拉斯堡天文资料中心.
- ^ Chupina, N. V.; et al, Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars, Astronomy and Astrophysics, June 2006, 451 (3): 909–916, Bibcode:2006A&A...451..909C, doi:10.1051/0004-6361:20054009 .
- ^ Escorza, A.; et al, Hertzsprung-Russell diagram and mass distribution of barium stars, Astronomy & Astrophysics, December 2017, 608: 13, Bibcode:2017A&A...608A.100E, S2CID 119428276, arXiv:1710.02029 , doi:10.1051/0004-6361/201731832, A100.
- ^ 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.
- ^ Richichi, A.; et al, CHARM2: An updated Catalog of High Angular Resolution Measurements, Astronomy and Astrophysics, February 2005, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
