A search for 6Li in stars with planets

被引:71
|
作者
Reddy, BE
Lambert, DL
Laws, C
Gonzalez, G
Covey, K
机构
[1] Univ Texas, Dept Astron, Austin, TX 78712 USA
[2] Univ Washington, Dept Astron, Seattle, WA 98195 USA
[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
关键词
stars : abundances; stars : atmospheres; planetary systems;
D O I
10.1046/j.1365-8711.2002.05682.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Using very high-resolution (R similar to 125 000) and high-quality (signal-to-noise ratio greater than or equal to 350) spectra, we have searched for Li-6 in stars hosting extrasolar planets. From detailed profile-fitting of the Li resonance line at 6707.7 Angstrom, we find no significant amount of Li-6 relative to Li-7 for any of eight planet-bearing stars (Li-6/Li-7 less than or equal to 0.0-0.03) with strong Li I lines. In particular, we do not confirm the presence of Li-6 with Li-6/Li-7 = 0.13 reported by Israelian et al. for HD 82943, a star with two known planets. Several of the eight stars plus HD 219542 A, the planetless primary of a binary, have been identified in the literature as possible recipients of accreted terrestrial material. For all of the planet-hosting stars and an additional five planetless stars, we find no Li-6.
引用
收藏
页码:1005 / 1016
页数:12
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