小獅座11
天球赤道座標：
09h 35m 39.50181s，+35° 48′ 36.4841″
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 小獅座 |
| 星官 | |
| 赤經 | 09h 35m 39.50181s[2] |
| 赤緯 | +35° 48′ 36.4841″[2] |
| 視星等（V） | 5.54 + 14.0[3] |
| 特性 | |
| 光谱分类 | G8V[4] + M4[5] |
| U−B 色指数 | 0.44/— |
| B−V 色指数 | 0.77/— |
| 变星类型 | RS CVn |
| 天体测定 | |
| 徑向速度 (Rv) | +14.40[6] km/s |
| 自行 (μ) | 赤经：−726.201[2] mas/yr 赤纬：−259.506[2] mas/yr |
| 视差 (π) | 89.009 ± 0.1928[2] mas |
| 距离 | 36.64 ± 0.08 ly (11.23 ± 0.02 pc) |
| 绝对星等 (MV) | 5.25±0.008[7] |
| 軌道[4] | |
| 伴星 | 11 LMi B |
| 繞行週期 (P) | 201 yr |
| 半長軸 (a) | 3.84" |
| 偏心率 (e) | 0.88 |
| 倾斜角 (i) | 117° |
| 詳細資料 | |
| 11 LMi A | |
| 質量 | 0.964[8] M☉ |
| 半徑 | 1.0029±0.0158[8] R☉ |
| 亮度 | 0.7550±0.0055[8] L☉ |
| 溫度 | 5376±43[8] K |
| 金属量 [Fe/H] | +0.33[9] dex |
| 自轉 | 18.0 days[9] |
| 年齡 | 7.9[8] Gyr |
| 11 LMi B | |
| 質量 | 0.23[10] M☉ |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 11 LMi A |
| 11 LMi B | |
| ARICNS | 11 LMi A |
| 11 LMi B | |
小獅座11 是一個位於小獅座的恆星系統[3]，距離地球36.6光年[2][11]。它是肉眼可見的暗淡黃色恆星，視星等為5.54[3]。該系統正以+14.4公里/秒的日心徑向速度遠離地球[6]。它具有相對較高的自行，以每年0.764弧秒的速度穿越天球[12]。
主星是一顆G 型主序星，恆星分類為G8V[4]，質量略小於太陽，亮度略低於太陽[8]。這是一顆獵犬座RS型變星，其光度在18天內變化了0.033星等[1]。與太陽相比，它的質量比氦大的元素多一倍多——天文學家稱其為恆星的金屬豐度[9]。
有一個伴星，一顆視星等14[3]的紅矮星，比主星暗得多。這對天體的軌道周期為201年，偏心率為0.88[4]。
參考資料
- ^ 1.0 1.1 Skiff, B. A.; et al, The photometric variability of solar-type stars. V - The standard stars 10 and 11 Leonis Minoris, Publications of the Astronomical Society of the Pacific, March 1986, 98: 338–341, Bibcode:1986PASP...98..338S, doi:10.1086/131763
- ^ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
- ^ 3.0 3.1 3.2 3.3 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.
- ^ 4.0 4.1 4.2 4.3 Malkov, O. Yu.; et al, Dynamical masses of a selected sample of orbital binaries, Astronomy & Astrophysics, 2012, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774 , A69
- ^ Reid, I. Neill; Cruz, Kelle L.; Allen, Peter R.; Mungall, Finlay; Kilkenny, David; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. Meeting the Cool Neighbors. VIII. A Preliminary 20 Parsec Census from the NLTT Catalogue. The Astronomical Journal (Submitted manuscript). 2004, 128 (1): 463. Bibcode:2004AJ....128..463R. S2CID 28314795. arXiv:astro-ph/0404061 . doi:10.1086/421374.
- ^ 6.0 6.1 Soubiran, C.; et al, Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants, Astronomy and Astrophysics, 2008, 480 (1): 91–101, Bibcode:2008A&A...480...91S, S2CID 16602121, arXiv:0712.1370 , doi:10.1051/0004-6361:20078788
- ^ Park, Sunkyung; et al, Wilson-Bappu Effect: Extended to Surface Gravity, The Astronomical Journal, 2013, 146 (4): 73, Bibcode:2013AJ....146...73P, S2CID 119187733, arXiv:1307.0592 , doi:10.1088/0004-6256/146/4/73.
- ^ 8.0 8.1 8.2 8.3 8.4 8.5 Boyajian, Tabetha S.; et al, Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations, The Astrophysical Journal, July 2013, 771 (1): 40, Bibcode:2013ApJ...771...40B, S2CID 14911430, arXiv:1306.2974 , doi:10.1088/0004-637X/771/1/40.
- ^ 9.0 9.1 9.2 Maldonado, J.; et al, A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups, Astronomy and Astrophysics, October 2010, 521: A12, Bibcode:2010A&A...521A..12M, S2CID 119209183, arXiv:1007.1132 , doi:10.1051/0004-6361/201014948
- ^ Tokovinin, Andrei, From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs, The Astronomical Journal, April 2014, 147 (4): 14, Bibcode:2014AJ....147...87T, S2CID 56066740, arXiv:1401.6827 , doi:10.1088/0004-6256/147/4/87, 87.
- ^ 11.0 11.1 * 11 LMi. SIMBAD. 斯特拉斯堡天文資料中心.
- ^ Lépine, Sébastien; Shara, Michael M., A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog), The Astronomical Journal, March 2005, 129 (3): 1483–1522, Bibcode:2005AJ....129.1483L, S2CID 2603568, arXiv:astro-ph/0412070 , doi:10.1086/427854.
外部連結
- Binary Catalog. [April 4, 2007]. （原始内容存档于September 28, 2007）.
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ||||||||||||||||||||||