小狮座11

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]。

小狮座11

小狮座11的光变曲线[1]
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)	7000525000000000000♠5.25±0.008[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	7000100289999999999♠1.0029±0.0158[8] R☉
亮度	6999755000000000000♠0.7550±0.0055[8] L☉
温度	7003537600000000000♠5376±43[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
11 LMi、​SV Leonis Minoris、​BD+36°1979、​GJ 356、​HD 82885、​HIP 47080、​HR 3815、​SAO 61586、​WDS 09357+3549[11]
参考数据库
SIMBAD	11 LMi A
	11 LMi B
ARICNS	11 LMi A
	11 LMi B

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

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. 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. 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. 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
5. 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. 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
7. 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. 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. 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
10. 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. * 11 LMi. SIMBAD. 斯特拉斯堡天文资料中心.
12. 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

• Binary Catalog. [April 4, 2007]. （原始内容存档于September 28, 2007）.