首页 | 本学科首页   官方微博 | 高级检索  
     检索      


The intermediate-age brown dwarf LP 944-20
Authors:Tinney
Institution:Anglo-Australian Observatory, PO Box 296, Epping NSW 2121, Australia
Abstract:Observations are presented which show that Li  I  λ 6708 is detected with an equivalent width of 0.53 ± 0.05? in the proper-motion object LP 944-20 (which is also known as BRI 0337-3535). Hα is detected in emission at an equivalent width of 1.2 ± 0.5?. The detection of Li implies a mass less than 0.065 M⊙, making this object a brown dwarf. Moreover, the relative weakness of this Li detection (compared to the equivalent widths of 1–2? seen in objects of similar spectral type in the Pleiades) implies that Li has been somewhat depleted. This, together with the precisely determined luminosity of LP 944-20, implies a mass between 0.056 and 0.064 M⊙, and age between 475 and 650 Myr. This makes it the first brown dwarf to have a well-constrained mass and age determined.
Keywords:stars: individual: LP 944-20  stars: low-mass  brown dwarfs
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号