期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 482, 期 3, 页码 3822-3830出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2939
关键词
stars: abundances; stars: atmospheres; stars: fundamental parameters; stars: interiors; stars: low-mass
资金
- Chinese NDRC
In this paper, we report the discovery of two new super Li-rich K giants: HD 24960 and TYC 1751-1713-1. Based on high-resolution (R approximate to 60000) spectroscopy, we have derived Li abundance of A(Li) approximate to 4.0 dex for both stars. Other elemental abundances are normal of typical K giants. Low ratios of [C/N] <= -0.25 and C-12/C-13 <= 10 suggest that the stars are in the upper red giant branch (RGB) phase. Further, based on Gala astrometry and secondary calibrations using Kepler asteroseismic and LAMOST spectroscopic data, we argue that both stars belong to the red clump (RC) phase with core He burning. Results add to a half-dozen already known RC Li-rich K giants and support the growing evidence that the origin of Li excess in RC giants seems to be associated with either He flash at the tip of the RGB or recent planet/ brown dwarf merger events closer to the RGB tip.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据