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孙增二

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孙增二(大犬座λ)
观测资料
历元 J2000.0
星座 大犬座
星官 井宿
赤经 06h 28m 10.20747s[1]
赤纬 −32° 34′ 48.2455″[1]
视星等(V) +4.48[2]
特性
光谱分类B4 V[3]
U−B 色指数−0.61[2]
B−V 色指数−0.17[2]
天体测定
径向速度 (Rv)+41.0±4.1[4] km/s
自行 (μ) 赤经:−14.41[1] mas/yr
赤纬:+25.21[1] mas/yr
视差 (π)7.70 ± 0.16[1] mas
距离424 ± 9 ly
(130 ± 3 pc)
绝对星等 (MV)−0.85[5]
详细资料
质量5.7±0.3[6] M
表面重力 (log g)3.93[7]
亮度560[8] L
温度16,300[3] K
自转速度 (v sin i)102±9[3] km/s
年龄39.8±19.1[6] Myr
其他命名
λ CMa、​CD−32°3066、​GC 8410、​HD 45813、​HIP 30788、​HR 2361、​SAO 196857[9]
参考数据库
SIMBAD资料

孙增二(大犬座λ)是大犬座中一颗蓝白色调的单独恒星[10]。孙增二的视星等是+4.48,在无光害的场所可以用裸眼看见[2]。根据从地球观察到的恒星视差7.70mas [1],它与太阳的距离为424光年。由于星际尘埃消光,在这样的距离上它的视亮度会降低0.14等[5]

这是一颗恒星光谱为B4V的B型主序星[3]。估计它的年龄是4,000万年[6],恒星的投影旋转速度为102公里/秒[3]。它的质量是5.7太阳质量[6]亮度太阳亮度的560倍[8],表面的有效温度为16,300K[3]

参考资料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752可免费查阅, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 2.3 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99): 99, Bibcode:1966CoLPL...4...99J. 
  3. ^ 3.0 3.1 3.2 3.3 3.4 3.5 Bragança, G. A.; et al, Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk, The Astronomical Journal, November 2012, 144 (5): 10, Bibcode:2012AJ....144..130B, arXiv:1208.1674可免费查阅, doi:10.1088/0004-6256/144/5/130, 130. 
  4. ^ Gontcharov, G. A., Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system, Astronomy Letters, November 2006, 32 (11): 759–771, Bibcode:2006AstL...32..759G, arXiv:1606.08053可免费查阅, doi:10.1134/S1063773706110065. 
  5. ^ 5.0 5.1 Gontcharov, G. A., Spatial distribution and kinematics of OB stars, Astronomy Letters, November 2012, 38 (11): 694–706, Bibcode:2012AstL...38..694G, arXiv:1606.09028可免费查阅, doi:10.1134/S1063773712110035. 
  6. ^ 6.0 6.1 6.2 6.3 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M., A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society, January 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883可免费查阅, doi:10.1111/j.1365-2966.2010.17434.x. 
  7. ^ Castelli, F., Effective temperature and gravity c0 and beta indices for B-type stars, Astronomy and Astrophysics, November 1991, 251: 106, Bibcode:1991A&A...251..106C. 
  8. ^ 8.0 8.1 McDonald, I.; et al, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037可免费查阅, doi:10.1111/j.1365-2966.2012.21873.x. 
  9. ^ lam CMa. SIMBAD. 斯特拉斯堡天文资料中心. [2017-09-07]. 
  10. ^ 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, arXiv:0806.2878可免费查阅, doi:10.1111/j.1365-2966.2008.13596.x. 

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