座旗五

维基百科,自由的百科全书
(重定向自御夫座ψ²
跳到导航 跳到搜索

Psi2 Aurigae
Diagram showing star positions and boundaries of the Auriga constellation and its surroundings
Cercle rouge 100%.svg

御夫座ψ2的位置(圈起处)
觀測資料
曆元 J2000
星座 御夫座
星官
赤經 06h 39m 19.82634s[1]
赤緯 +42° 29′ 19.9617″[1]
視星等(V) 4.79[2]
特性
光谱分类K3 III[3] or K3 Iab:[4]
U−B 色指数+1.30[2]
B−V 色指数+1.23[2]
R−I 色指数0.6
天体测定
径向速度 (Rv)16.09 ± 0.19[5] km/s
自行 (μ) 赤经:-0.87[1] mas/yr
赤纬:-54.97[1] mas/yr
视差 (π)7.84 ± 0.29[1] mas
距离420 ± 20 ly
(128 ± 5 pc)
詳細資料
半徑27[6] R
表面重力 (log g)2.30[7]
溫度4,410[7] K
金属量 [Fe/H]–0.10[7] dex
自轉速度 (v sin i)1.0[8] km/s
其他命名
50 Aurigae, BD+42 1585, HD 47174, HIP 31832, HR 2427, SAO 41239.[9]

座旗五ψ2Aurigae/御夫座ψ2),是御夫座的一颗恒星。视星等4.79[2],裸眼观测显得微亮。因为星际气体及尘埃而产生的消光的缘故,其亮度减少了0.07[5]

根据多项研究表明,由恒星光谱可得座旗五为一颗 K3 III型巨星[3],可是根据2003年的研究上座旗五被分类为K3 Iab型的超巨星[4][9]。经过周边昏暗修正的角直径测量数据为1.97 ± 0.02 mas[10]。估计这颗恒星距离[1]地球为27倍的太阳半径[6]

参考资料[编辑]

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, Floor, Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752v1, doi:10.1051/0004-6361:20078357.  Note: see VizieR catalogue I/311.
  2. ^ 2.0 2.1 2.2 2.3 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. ^ 3.0 3.1 Herbig, George H.; Spalding, John F., Jr., Axial Rotation and Line Broadening in Stars of Spectral Types F0-K5, Astrophysical Journal, January 1955, 121: 118, Bibcode:1955ApJ...121..118H, doi:10.1086/145969. 
  4. ^ 4.0 4.1 Kidger, Mark R.; Martín-Luis, Fabiola, High-Precision Near-Infrared Photometry of a Large Sample of Bright Stars Visible from the Northern Hemisphere, The Astronomical Journal, June 2003, 125 (6): 3311–3333, Bibcode:2003AJ....125.3311K4, doi:10.1086/374996. 
  5. ^ 5.0 5.1 Famaey, B.; 等, Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters, Astronomy and Astrophysics, January 2005, 430 (1): 165–186, Bibcode:2005A&A...430..165F, arXiv:astro-ph/0409579, doi:10.1051/0004-6361:20041272. 
  6. ^ 6.0 6.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3, Birkhäuser, 2006, ISBN 3-540-29692-1 . The radius (R*) is given by:
  7. ^ 7.0 7.1 7.2 McWilliam, Andrew, High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances, Astrophysical Journal Supplement Series, December 1990, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527. 
  8. ^ De Medeiros, J. R.; 等, Rotation and lithium in single giant stars, Astronomy and Astrophysics, November 2000, 363: 239–243, Bibcode:2000A&A...363..239D, arXiv:astro-ph/0010273. 
  9. ^ 9.0 9.1 50 Aur -- Star in double system, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2012-08-24]. 
  10. ^ Richichi; Percheron, I.; Khristoforova, M., CHARM2: An updated Catalog of High Angular Resolution Measurements, Astronomy and Astrophysics, February 2005, 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.