AN EXTREME POPULATION-II DWARF WITHOUT LITHIUM

被引：43

作者：

HOBBS, LM

WELTY, DE

THORBURN, JA

机构：

[1] University of Chicago, Yerkes Observatory, Williams Bay

[2] University of Chicago, Astronomy and Astrophysics Center, Chicago, IL 60637

来源：

ASTROPHYSICAL JOURNAL | 1991年 / 373卷 / 02期

关键词：

EARLY UNIVERSE; STARS; ABUNDANCES; POPULATION-II;

D O I：

10.1086/186048

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

G186-26 is an apparently normal, Population II dwarf with [Fe/H] = -2.9 and T(e) = 6220 K. A high-dispersion spectrogram of this extreme halo star recorded at the Li I lambda-6707 line shows no detectable surface lithium, at an abundance upper limit N(Li) = 12 + log (Li/H) less-than-or-equal-to 1.23. In comparison with the uniform lithium abundance N(Li) almost-equal-to 2.17 found previously in 11 other halo dwarfs with [Fe/H] less-than-or-similar-to -2.6, the minimum deficiency of surface lithium in G186-26 therefore exceeds a factor of 8.

引用

页码：L47 / L49

页数：3

共 19 条

[1] LITHIUM IN THE HYADES CLUSTER [J].