盾牌座γ

盾牌座γ，名稱來自拉丁文的Gamma Scuti，是一顆單獨的，白色的恆星，位置在盾牌座的南部。它的視星等為4.67，表明這雖然是一顆暗星，但在足夠黑暗的場所依然可以肉眼看見。根據從地球上觀察到的10.21mas的周年視差，這顆恆星距離太陽約319光年。現時，它正以41km/s的速度向太陽系移動，這意味著在235萬年後，它將以 20 ly（5.519 pc）的距離掠過，可能有一段時間成為夜空中最亮的恒星：視星等 − 2.1等。 這是一顆A型主序星，恆星分類為A2V，年齡約2億3,700萬年。它以222km/s的投影旋轉速度快速旋轉。這使恆星形成略為扁平的形狀，具有顯著的赤道隆起，估計比極半徑大21%。估計這顆恆星的質量是太陽的2.91倍，半徑是太陽的4.1倍。在表面9,016K的有效溫度下，來自其光球的輻射是太陽光度的150倍。 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.  Vizier catalog entry （页面存档备份，存于互联网档案馆） Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015.  Vizier catalog entry （页面存档备份，存于互联网档案馆） Abt, Helmut A.; Morrell, Nidia I. The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars. Astrophysical Journal Supplement. 1995, 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.  Mallama, A. Sloan Magnitudes for the Brightest Stars. The Journal of the American Association of Variable Star Observers. 2014, 42 (2): 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry （页面存档备份，存于互联网档案馆） Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. 2006, 32 (11): 759–771. Bibcode:2006AstL...32..759G. S2CID 119231169. arXiv:1606.08053 . doi:10.1134/S1063773706110065.  Zorec, J.; Royer, F. Rotational velocities of A-type stars. Astronomy & Astrophysics. 2012, 537: A120. Bibcode:2012A&A...537A.120Z. S2CID 55586789. arXiv:1201.2052 . doi:10.1051/0004-6361/201117691.  Vizier catalog entry （页面存档备份，存于互联网档案馆） Allende Prieto, C.; Lambert, D. L. Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures. Astronomy and Astrophysics. 1999, 352: 555–562. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002 .  Vizier catalog entry （页面存档备份，存于互联网档案馆） David, Trevor J.; Hillenbrand, Lynne A. The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets. The Astrophysical Journal. 2015, 804 (2): 146. Bibcode:2015ApJ...804..146D. S2CID 33401607. arXiv:1501.03154 . doi:10.1088/0004-637X/804/2/146.  Vizier catalog entry （页面存档备份，存于互联网档案馆） Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.  Bailer-Jones, C. A. L., Close encounters of the stellar kind, Astronomy & Astrophysics, March 2015, 575: 13, Bibcode:2015A&A...575A..35B, S2CID 59039482, arXiv:1412.3648 , doi:10.1051/0004-6361/201425221, A35.  Kaler, Jim. Gamma Scuti. [2017-04-21]. （原始内容存档于2016-03-05）.  van Belle, Gerard T., Interferometric observations of rapidly rotating stars, The Astronomy and Astrophysics Review, March 2012, 20 (1): 51, Bibcode:2012A&ARv..20...51V, S2CID 119273474, arXiv:1204.2572 , doi:10.1007/s00159-012-0051-2.