西次相

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西次相
Diagram showing star positions and boundaries of the Leo constellation and its surroundings
Cercle rouge 100%.svg

西次相的位置(红圈处)
觀測資料
曆元 J2000.0
星座 狮子座
星官
赤經 11h 14m 14.40446s[1]
赤緯 +15° 25′ 46.4541″[1]
視星等(V) +3.324[2]
特性
光谱分类 A2 V[3]
U−B 色指数 +0.07[2]
B−V 色指数 –0.02[2]
天体测定
径向速度 (Rv) +7.6[4] km/s
自行 (μ) 赤经:-60.31[1] mas/yr
赤纬:-79.10[1] mas/yr
视差 (π) 19.76 ± 0.17[1] mas
距离 165 ± 1 ly
(50.6 ± 0.4 pc)
绝对星等 (MV) −0.19[5]
詳細資料
質量 2.5[6] M
表面重力 (log g) 3.65[7]
亮度 141[6] L
溫度 9,350[7] K
金属量 [Fe/H] +0.05[7] dex
自轉速度 (v sin i) 23[8] km/s
年齡 550[7] Myr
其他命名
θ Leo, Theta Leo, 70 Leo, HR 4359, BD+16 2234, HD 97633, SAO 99512, FK5 423, HIP 54879.[9]
參考資料庫
SIMBAD data

西次相 (θ Leo / 狮子座θ)是狮子座的一颗恒星,也称太微右垣四,西次相的光谱型为A0,视星等为+3.4。距离地球170光年

参考文献[编辑]

  1. ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357 
  2. ^ 2.0 2.1 2.2 Johnson, H. L.; 等, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99), Bibcode:1966CoLPL...4...99J 
  3. ^ Cowley, A.; 等, A study of the bright A stars. I. A catalogue of spectral classifications, Astronomical Journal, April 1969, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819 
  4. ^ Wielen, R.; 等, Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, 1999, Bibcode:1999VeARI..35....1W 
  5. ^ Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971, doi:10.1134/S1063773712050015. 
  6. ^ 6.0 6.1 Wyatt, M. C.; 等, Steady State Evolution of Debris Disks around A Stars, The Astrophysical Journal, July 2007, 663 (1): 365–382, Bibcode:2007ApJ...663..365W, arXiv:astro-ph/0703608, doi:10.1086/518404 
  7. ^ 7.0 7.1 7.2 7.3 Smith, K. C.; Dworetsky, M. M., Elemental Abundances in Normal Late B-Stars and Hgmn-Stars from Co-Added IUE Spectra - Part One - Iron Peak Elements, Astronomy and Astrophysics, 1993, 274 (2): 335, Bibcode:1993A&A...274..335S 
  8. ^ Royer, F.; Zorec, J.; Gómez, A. E., Rotational velocities of A-type stars. III. Velocity distributions, Astronomy and Astrophysics, February 2007, 463 (2): 671–682, Bibcode:2007A&A...463..671R, arXiv:astro-ph/0610785, doi:10.1051/0004-6361:20065224 
  9. ^ tet Leo -- Variable Star, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-02-11]