東海增一
東海增一,是拜耳以拉丁字母ζ命名的一顆恆星[9],它是一顆黃白色調的恆星,位於赤道上的巨蛇座。它的視星等為+4.6等,以肉眼就可以看見[3],根據太空探測器依巴谷衛星測量的視差變化42.4毫角秒的周年視差,它與太陽的距離是77光年,而且正以-50.7公里/秒的徑向速度接近太陽[5]。估計它會在40萬年的時間裡,以最接近的近日點距離25.7 ly(7.88 pc)掠過太陽[10]。
東海增一的年齡大約是24億歲[1],它的光譜類型是F2V [4],表示它是一顆普通的F型主序星。這顆恆星的直徑大約是太陽的2倍,質量是1.4倍,來自外大氣層的有效溫度為6529k,輻射的光度是太陽的6.3倍[1]。它有一個相對較高的旋轉速度,顯示的投影旋轉速度是69公里/秒[6]。
參考資料
- ^ 1.0 1.1 1.2 1.3 1.4 Boyajian, Tabetha S.; et al, Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars, The Astrophysical Journal, February 2012, 746 (1): 101, Bibcode:2012ApJ...746..101B, arXiv:1112.3316
, doi:10.1088/0004-637X/746/1/101 . See Table 10.
- ^ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2018-05-13]. Bibcode:2007A&A...474..653V. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357. (原始内容存档于2019-03-28). Vizier catalog entry (页面存档备份,存于互联网档案馆)
- ^ 3.0 3.1 3.2 3.3 Kozok, J. R. Photometric observations of emission B-stars in the southern Milky Way. Astronomy and Astrophysics Supplement Series. September 1985, 61: 387–405. Bibcode:1985A&AS...61..387K.
- ^ 4.0 4.1 Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I., The Astronomical Journal, October 2003, 126 (4): 2048–2059, Bibcode:2003AJ....126.2048G, arXiv:astro-ph/0308182
, doi:10.1086/378365
- ^ 5.0 5.1 Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. November 2006, 32 (11): 759–771. Bibcode:2006AstL...32..759G. arXiv:1606.08053
. doi:10.1134/S1063773706110065.
- ^ 6.0 6.1 6.2 Reiners, A., Rotation- and temperature-dependence of stellar latitudinal differential rotation, Astronomy and Astrophysics, January 2006, 446 (1): 267–277, Bibcode:2006A&A...446..267R, arXiv:astro-ph/0509399
, doi:10.1051/0004-6361:20053911.
- ^ 7.0 7.1 Balachandran, Suchitra, Lithium depletion and rotation in main-sequence stars, Astrophysical Journal, Part 1, May 1, 1990, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691
- ^ [ * zet Peg]. SIMBAD. 斯特拉斯堡天文資料中心. [2015-10-17].
- ^ Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. 2008, 389 (2): 869–879. Bibcode:2008MNRAS.389..869E. 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. arXiv:1412.3648
. doi:10.1051/0004-6361/201425221. A35.
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