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]

小獅座11

小獅座11的光變曲線[1]
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
光譜分類G8V[4] + M4[5]
U−B 色指數0.44/—
B−V 色指數0.77/—
變星類型RS CVn
天體測定
徑向速度 (Rv)+14.40[6] km/s
自行 (μ) 赤經:−726.201[2] mas/yr
赤緯:−259.506[2] mas/yr
視差 (π)89.009 ± 0.1928[2] mas
距離36.64 ± 0.08 ly
(11.23 ± 0.02 pc)
絕對星等 (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
傾斜角 (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
金屬量 [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
11 LMi、​SV Leonis Minoris、​BD+36°1979、​GJ 356、​HD 82885、​HIP 47080、​HR 3815、​SAO 61586、​WDS 09357+3549[11]
參考資料庫
SIMBAD11 LMi A
11 LMi B
ARICNS11 LMi A
11 LMi B

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

編輯
  1. ^ 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. ^ 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中此天體在蓋亞望遠鏡第二批數據發佈的記錄
  3. ^ 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. ^ 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 
  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. ^ 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 
  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. ^ 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. ^ 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 
  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. ^ 11.0 11.1 * 11 LMi. SIMBAD. 斯特拉斯堡天文資料中心. 
  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. 

外部連結

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