格利泽250
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 麒麟座 |
| 星官 | |
| 赤经 | 06h 52m 18.05045s[1] |
| 赤纬 | -05° 10′ 25.36617″[1] |
| 视星等（V） | 6.58[2] |
| 特性 | |
| 演化阶段 | 主序星 |
| 光谱分类 | K3.5 V[3] |
| B−V 色指数 | 1.071±0.008[2] |
| 天体测定 | |
| 径向速度 (Rv) | −7.20±0.15[4] km/s |
| 自行 (μ) | 赤经：−543.616[1] mas/yr 赤纬：−3.491[1] mas/yr |
| 视差 (π) | 114.2968 ± 0.0465[1] mas |
| 距离 | 28.54 ± 0.01 ly (8.749 ± 0.004 pc) |
| 绝对星等 (MV) | 6.87[5] |
| 详细资料 | |
| 质量 | 0.79[6] M☉ |
| 半径 | 0.73+0.01 −0.02[1] R☉ |
| 表面重力 (log g) | 4.64[6] |
| 亮度 | 0.225[1] L☉ |
| 温度 | 4,712±8.5[7] K |
| 金属量 [Fe/H] | +0.01[8] dex |
| 自转速度 (v sin i) | 5.5[6] km/s |
| 年龄 | 1.88[6] Gyr |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | A |
| B | |
HD 50281 是一个位于麒麟座附近的联星系统，由一颗橙矮星和一颗红矮星组成。主星色调为橙色，视星等为6.58[2]，处于或低于肉眼可见度的典型极限。根据视差，这颗恒星距离太阳28.5光年，但正在以-7.2 公里/秒的视向速度靠近[4]。
主星是一颗普通的K型主序星，恒星分类为K3.5 V[3]。它已有近 20 亿年的历史，并以5.5 公里/秒的预计自转速度自转[6]。主星的金属量接近太阳。该恒星具有太阳质量的79%[6]和太阳半径的73%[1]。它从光球层发射出太阳光度的22.5%[1]，有效温度为4,712 K。[7]。
伴星为一颗视星等为10.16 的普通自行恒星[10]。
参考资料
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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
- ^ 2.0 2.1 2.2 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 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. July 2006, 132 (1): 161–170. Bibcode:2006AJ....132..161G. S2CID 119476992. arXiv:astro-ph/0603770 . doi:10.1086/504637.
- ^ 4.0 4.1 Bailer-Jones, C.A.L.; et al. New stellar encounters discovered in the second Gaia data release. Astronomy & Astrophysics. 2018, 616: A37. Bibcode:2018A&A...616A..37B. S2CID 56269929. arXiv:1805.07581 . doi:10.1051/0004-6361/201833456.
- ^ Holmberg, J.; et al. The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics. Astronomy and Astrophysics. July 2009, 501 (3): 941–947. Bibcode:2009A&A...501..941H. S2CID 118577511. arXiv:0811.3982 . doi:10.1051/0004-6361/200811191.
- ^ 6.0 6.1 6.2 6.3 6.4 6.5 Luck, R. Earle. Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants. The Astronomical Journal. January 2017, 153 (1): 19. Bibcode:2017AJ....153...21L. S2CID 119511744. arXiv:1611.02897 . doi:10.3847/1538-3881/153/1/21. 21.
- ^ 7.0 7.1 Kovtyukh, V. V.; et al. High precision effective temperatures for 181 F-K dwarfs from line-depth ratios. Astronomy and Astrophysics. 2003, 411 (3): 559–564. Bibcode:2003A&A...411..559K. S2CID 18478960. arXiv:astro-ph/0308429 . doi:10.1051/0004-6361:20031378.
- ^ Rojas-Ayala, Bárbara; et al. Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs (PDF). The Astrophysical Journal. April 2012, 748 (2): 93 [2023-04-13]. Bibcode:2012ApJ...748...93R. S2CID 41902340. arXiv:1112.4567 . doi:10.1088/0004-637X/748/2/93. （原始内容存档 (PDF)于2021-01-29）.
- ^ [ HD 50281] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. - ^ Mason, B. D.; et al. The Washington Visual Double Star Catalog. The Astronomical Journal. 2014, 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920 .
外部链接
- SolStation （页面存档备份，存于互联网档案馆）
- ARICNS
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