軫宿二
  | |
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 烏鴉座 |
| 星官 | |
| 赤經 | 12h 10m 07.48058s[1] |
| 赤緯 | –22° 37′ 11.1620″[1] |
| 視星等（V） | +3.024[2] |
| 特性 | |
| 光譜分類 | K2 III[3] |
| U−B 色指數 | +1.458[2] |
| B−V 色指數 | +1.318[2] |
| 天體測定 | |
| 徑向速度 (Rv) | +4.9[4] km/s |
| 自行 (μ) | 赤經：–71.74 mas/yr 赤緯：+10.25 mas/yr |
| 視差 (π) | 10.26 ± 0.16[1] mas |
| 距離 | 318 ± 5 ly (97 ± 2 pc) |
| 絕對星等 (MV) | −1.82+0.15 −0.14[5] |
| 詳細資料 | |
| 質量 | 3.2[6] M☉ |
| 半徑 | 52[7] R☉ |
| 表面重力 (log g) | 2.16[8] |
| 溫度 | 4320[8] K |
| 金屬量 [Fe/H] | –0.13[8] dex |
| 自轉速度 (v sin i) | 1.0[6] km/s |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 資料 |
軫宿二是一顆紅巨星，其恆星分類為K2III。它已經耗盡了核心的氫，在演化上易經遠離主序列。它的質量約為太陽的3倍[6]。以干涉測量術量測得到這顆恆星的角直徑大約為4.99 毫角秒[13]，以其估計的距離，它的真實半徑大約相當於太陽半徑的52倍[7]。表面的有效溫度是4320 K[8]，使其具有K型恆星特有的橙色色調[14]。它的質量大約是太陽的4倍，在其生命的大部分時間裏都是光譜類型為B5V的主序星[15]。
參考資料
[編輯]- ^ 1.0 1.1 1.2 1.3 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357
- ^ 2.0 2.1 2.2 2.3 Celis S., L., Photoelectric photometry of late-type variable stars, Astronomy and Astrophysics Supplement Series, October 1975, 22: 9–17, Bibcode:1975A&AS...22....9C
- ^ Houk, Nancy, Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, 1979, Bibcode:1988mcts.book.....H
- ^ Wielen, R.; et al, Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg (Astronomisches Rechen-Institut Heidelberg), 1999, 35 (35): 1, Bibcode:1999VeARI..35....1W
- ^ Carney, Bruce W.; et al, Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars, The Astronomical Journal, March 2008, 135 (3): 892–906, Bibcode:2008AJ....135..892C, S2CID 2756572, arXiv:0711.4984 , doi:10.1088/0004-6256/135/3/892
- ^ 6.0 6.1 6.2 Melo, C. H. F.; et al, On the nature of lithium-rich giant stars. Constraints from beryllium abundances, Astronomy and Astrophysics, August 2005, 439 (1): 227–235, Bibcode:2005A&A...439..227M, S2CID 10580797, arXiv:astro-ph/0504133 , doi:10.1051/0004-6361:20041805
- ^ 7.0 7.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2024-04-02], ISBN 3-540-29692-1, （原始內容存檔於2023-07-28）. The radius (R*) is given by:
- ^ 8.0 8.1 8.2 8.3 McWilliam, Andrew, High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances, Astrophysical Journal Supplement Series, December 1990, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527
- ^ MINKAR -- Variable Star, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-01-23], （原始內容存檔於2024-04-11）
- ^ Al-Sufi, Book Of Fixed Stars, Constellation: The Crow. [2024-04-02]. （原始內容存檔於2020-10-03）.
- ^ （中文） 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ （中文） 香港太空館 - 研究資源 - 亮星中英對照表 互聯網檔案館的存檔，存檔日期January 30, 2011，., Hong Kong Space Museum. Accessed on line November 23, 2010.
- ^ Richichi, A.; Percheron, I.; Khristoforova, M., CHARM2: An updated Catalog of High Angular Resolution Measurements, Astronomy and Astrophysics, February 2005, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
- ^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始內容存檔於2012-03-18）
- ^ Kaler, James B. (Jim), Minkar, Stars (University of Illinois), [12 July 2015], （原始內容存檔於2021-04-15）
