天鹰座ω2Omega2 Aquilae),是从拉丁文ω2 Aquilae转换而来,是拜耳命名法所赋予的名称。这颗恒星是位在天球赤道上的星座天鹰座的一颗恒星。它的视星等为6.0等[2],接近肉眼可以看见的下限。依据波特尔暗空分类法的尺度,这颗恒星要到天空足够黑暗的荒郊野外才能用肉眼直接看到。当地球绕着太阳公转时,这颗恒星的周年视差值为12.27mas[1],相当于与地球的有形距离为270光年(83秒差距),给出的误差范围在10光年。

天鹰座ω2
天鹰座ω2 的位置(圆圈)
观测资料
历元 J2000.0
星座 天鹰座
星官
赤经 19h 19m 53.06650s[1]
赤纬 +11° 32′ 05.8750″[1]
视星等(V) 6.023[2]
特性
光谱分类A2 V[3]
U−B 色指数+0.07[4]
B−V 色指数+0.08[4]
天体测定
径向速度 (Rv)−26[5] km/s
自行 (μ) 赤经:43.77[1] mas/yr
赤纬:22.57[1] mas/yr
视差 (π)12.27 ± 0.52[1] mas
距离270 ± 10 ly
(81 ± 3 pc)
绝对星等 (MV)1.48[6]
详细资料
半径2.0[7] R
亮度22[6] L
温度8,936[8] K
自转速度 (v sin i)154[9] km/s
其他命名
ω2 Aql, 天鹰座29BD+11° 3802、GC 26660、HD 181383、HIP 95002、HR 7332、 PPM 136128、SAO 104728[2]
参考数据库
SIMBAD资料

分析这颗恒星的光谱,显示的恒星光谱与A2V相匹配[3],表示它是A型主序星,大小是太阳的2倍。外大气层有效温度为8,936K[8],使它辐射出A型星的白色色调</ref>[10]。天鹰座ω2快速的投影转速是每秒154公里[9]

参考资料

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  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, 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 ome02 Aql. SIMBAD. 斯特拉斯堡天文资料中心. [2012-07-21]. 
  3. ^ 3.0 3.1 Cowley, A.; et al, 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. ^ 4.0 4.1 Osawa, K.; Hata, S., Three-color photometry of B8-A2 stars (II)., Annals of the Tokyo Astronomical Observatory, 1962, 7: 209, Bibcode:1962AnTok...7..209O. 
  5. ^ Evans, D. S., The Revision of the General Catalogue of Radial Velocities, Batten, Alan Henry; Heard, John Frederick (编), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, June 20–24, 1966, Bibcode:1967IAUS...30...57E. 
  6. ^ 6.0 6.1 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. 
  7. ^ Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics, Astronomy and Astrophysics, February 2001, 367: 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451. 
  8. ^ 8.0 8.1 Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A., The PASTEL catalogue of stellar parameters, Astronomy and Astrophysics, June 2010, 515: A111, Bibcode:2010A&A...515A.111S, arXiv:1004.1069 , doi:10.1051/0004-6361/201014247. 
  9. ^ 9.0 9.1 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. 
  10. ^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], (原始内容存档于2012-03-10). 

外部链接

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