小狮座11
外观
观测资料 历元 J2000 | |
---|---|
星座 | 小狮座 |
星官 | |
赤经 | 09h 35m 39.50181s[2] |
赤纬 | +35° 48′ 36.4841″[2] |
视星等(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 | |
径向速度 (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) | ±0.008 5.25[7] |
轨道[4] | |
伴星 | 11 LMi B |
绕行周期 (P) | 201 yr |
半长轴 (a) | 3.84" |
偏心率 (e) | 0.88 |
倾斜角 (i) | 117° |
详细资料 | |
11 LMi A | |
质量 | 0.964[8] M☉ |
半径 | ±0.0158 1.0029[8] R☉ |
亮度 | ±0.0055 0.7550[8] L☉ |
温度 | 376±43 5[8] K |
金属量 [Fe/H] | +0.33[9] dex |
自转 | 18.0 days[9] |
年龄 | 7.9[8] Gyr |
11 LMi B | |
质量 | 0.23[10] M☉ |
其他命名 | |
参考资料库 | |
SIMBAD | 11 LMi A |
11 LMi B | |
ARICNS | 11 LMi A |
11 LMi B |
小狮座11 是一个位于小狮座的恒星系统[3],距离地球36.6光年[2][11]。它是肉眼可见的暗淡黄色恒星,视星等为5.54[3]。该系统正以+14.4公里/秒的日心径向速度远离地球[6]。它具有相对较高的自行,以每年0.764弧秒的速度穿越天球[12]。
主星是一颗G 型主序星,恒星分类为G8V[4],质量略小于太阳,亮度略低于太阳[8]。这是一颗猎犬座RS型变星,其光度在18天内变化了0.033星等[1]。与太阳相比,它的质量比氦大的元素多一倍多——天文学家称其为恒星的金属丰度[9]。
有一个伴星,一颗视星等14[3]的红矮星,比主星暗得多。这对天体的轨道周期为201年,偏心率为0.88[4]。
参考资料
[编辑]- ^ 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 [ 请检查
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值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. * 11 LMi] - ^ 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.
外部链接
[编辑]- Binary Catalog. [April 4, 2007]. (原始内容存档于September 28, 2007).
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