格利泽250

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]

HD 50281
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
88 G. Monocerotis、​BD−05°1844、​GJ 250、​HD 50281、​HIP 32984、​HR 2534、​SAO 133805、​WDS J06523−0510、​LFT 494、​LHS 1875、​LTT 2662[9]
参考资料库
SIMBADA
B

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]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. ^ 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. ^ 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. ^ 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. ^ 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. 
  5. ^ 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. ^ 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. ^ 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. 
  8. ^ 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). 
  9. ^ HD 50281. SIMBAD. 斯特拉斯堡天文资料中心. 
  10. ^ 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