天鷹座ω2
天鷹座ω2(Omega2 Aquilae),是從拉丁文的 ω2 Aquilae轉換而來,是拜耳命名法所賦予的名稱。這顆恆星是位在天球赤道上的星座,天鷹座的一顆恆星。它的視星等為6.0等[2],接近肉眼可以看見的下限。依據波特爾暗空分類法的尺度,這顆恆星要到天空足夠黑暗的荒郊野外才能用肉眼直接看到。當地球繞著太陽公轉時,這顆恆星的周年視差值為12.27mas[1],相當於與地球的有形距離為270光年(83秒差距),給出的誤差範圍在10光年。
觀測資料 曆元 J2000.0 | |
---|---|
星座 | 天鷹座 |
星官 | |
赤經 | 19h 19m 53.06650s[1] |
赤緯 | +11° 32′ 05.8750″[1] |
視星等(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 | |
徑向速度 (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] |
詳細資料 | |
半徑 | 2.0[7] R☉ |
亮度 | 22[6] L☉ |
溫度 | 8,936[8] K |
自轉速度 (v sin i) | 154[9] km/s |
其他命名 | |
參考資料庫 | |
SIMBAD | 资料 |
分析這顆恆星的光譜,顯示的恆星光譜與A2V相匹配[3],表示它是A型主序星,大小是太陽的2倍。外大氣層的有效溫度為8,936K[8],使它輻射出A型星的白色色調</ref>[10]。天鷹座ω2快速的投影轉速是每秒154公里[9]。
參考資料
- ^ 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.
- ^ 2.0 2.1 2.2 ome02 Aql. SIMBAD. 斯特拉斯堡天文資料中心. [2012-07-21].
- ^ 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.
- ^ 4.0 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.
- ^ 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.
- ^ 6.0 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.
- ^ 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.
- ^ 8.0 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.
- ^ 9.0 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.
- ^ 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).