LP 944-20

LP 944-20
觀測資料
曆元 J2000
星座 天爐座
星官
赤經 03h 39m 35.220s[1]
赤緯 –35° 25′ 44.09″[1]
視星等（V） 18.69
特性
光谱分类M9[1]
视星等 (B)~20.17[1]
视星等 (I)~13.288[1]
视星等 (J)10.725±0.021[1]
视星等 (H)10.017±0.021[1]
视星等 (K)9.548±0.023[1]
天体测定
自行 (μ) 赤经：309.001±0.050[2] mas/yr
赤纬：269.058±0.064[2] mas/yr
视差 (π)155.5982 ± 0.0522[2] mas
距离20.961 ± 0.007 ly
(6.427 ± 0.002 pc)
绝对星等 (MV)20.02
詳細資料 [3]
質量0.06+0.04
− M☉
溫度2650+30
− K
自轉<4.5 hrs
自轉速度 (v sin i)28+4
− km/s
年齡320 +80
− 百萬 年
其他命名
LP 944-20, SIPS J0339−3525, LEHPM 3451, 2MASSI J0339352−352544, [B2006] J033935.2−352544, APMPM J0340−3526, 2MASS J03393521-3525440, 2MASSW J0339352−352544, BRI B0337−3535, BRI 0337−3535, 2MUCD 10201, Gaia DR2 4860376345833699840
參考資料庫
SIMBAD资料
LP 944-20 is located in the constellation Fornax
LP 944-20 is located in the constellation Fornax
LP 944-20
LP 944-20在天爐座的位置

LP 944-20是位於天爐座的一顆光譜類型為M9非常暗淡的棕矮星，距離太陽系20.9光年。視星等為18.69，近星研究會上列出的恆星中最暗淡的恆星之一。

物理特性

由於自轉週期短，這顆年輕的褐矮星表現出強烈而頻繁的X射線耀斑，並擁有光球層級高達135G的強磁場。[3]1999年12月15日，探測到X射線耀斑。[4][5]

2007年發表的觀測結果表明，LP 944-20的大氣層含有大量鋰，並且它有塵土飛揚的雲。[6]

註釋


參考

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 SIPS J0339-3525 -- Brown Dwarf (M<0.08solMass). Centre de Données astronomiques de Strasbourg. [2009-12-14]. （原始内容存档于2021-08-31）. 
  2. ^ 2.0 2.1 2.2 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 可免费查阅. doi:10.1051/0004-6361/202039657 可免费查阅.  已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. ^ 3.0 3.1 Guenther, E. W.; Zapatero-Osorio, María Rosa; Mehner, A.; Martín, Eduardo L., Short-term spectroscopic monitoring of two cool dwarfs with strong magnetic fields, Astronomy & Astrophysics, 2009, 498 (1): 281–287, Bibcode:2009A&A...498..281G, S2CID 18611224, arXiv:0903.2340 可免费查阅, doi:10.1051/0004-6361/200810216 
  4. ^ Rutledge, Robert E.; Basri, Gibor; Martín, Eduardo L.; Bildsten, Lars. Chandra Detection of an X-Ray Flare from the Brown Dwarf LP 944-20. The Astrophysical Journal. 1 August 2000, 538 (2): L141–L144. Bibcode:2000ApJ...538L.141R. S2CID 17800872. arXiv:astro-ph/0005559 可免费查阅. doi:10.1086/312817. 
  5. ^ LP 944-20. Solstation.com. [2017-03-11]. （原始内容存档于2023-03-22）. 
  6. ^ Pavlenko, Ya. V.; Jones, H. R. A.; Martín, Eduardo L.; Guenther, E.; Kenworthy, M. A.; Zapatero-Osorio, María Rosa. Lithium in LP944-20. Monthly Notices of the Royal Astronomical Society. September 2007, 380 (3): 1285–96. Bibcode:2007MNRAS.380.1285P. S2CID 11186385. arXiv:0707.0694 可免费查阅. doi:10.1111/j.1365-2966.2007.12182.x. 

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