鱉六(α CrA/南冕座α),是南冕座的最亮恆星,視星等為4.10。它是一個類似織女星的A型星,自轉非常快,接近崩裂速度。
特性
鱉六的恆星分類為A1V,[5]距離地球大約125光年。該星的質量估計為2.1倍太陽,半徑2.2倍太陽。表面溫度大約9,100K,輻射出30倍太陽光度。[5] 該星的年齡為2.54億年。[2] 它是一個自轉快速的恆星,赤道的速度接近200km/s,自轉一周大約14小時。[6] 像織女星,它有紅外線超量,代表它可能被塵埃盤環繞。[5]
參考資料
- ^ 1.0 1.1 1.2 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 Song, Inseok; et al, Ages of A-Type Vega-like Stars from uvbyβ Photometry, The Astrophysical Journal, February 2001, 546 (1): 352–357, Bibcode:2001ApJ...546..352S, arXiv:astro-ph/0010102 , doi:10.1086/318269
- ^ 3.0 3.1 3.2 3.3 3.4 3.5 SIMBAD query result:alf CrA -- Star. Centre de Données astronomiques de Strasbourg. [2012-09-02]. (原始內容存檔於2013-04-22).
- ^ α Coronae Australis (star). Wolfram Alpha. [2012-09-02]. (原始內容存檔於2013-04-22).
- ^ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Kaler, James B. ALFECCA MERIDIANA (Alpha Coronae Australis). Stars. University of Illinois. [2012-09-02]. (原始內容存檔於2019-11-17).
- ^ 6.0 6.1 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.