Detection of lithium in a main-sequence bulge star using Keck I as a 15 meter diameter telescope

被引：30

作者：

Minniti, D ^{[1
]}

Vandehei, T

Cook, KH

Griest, K

Alcock, C

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Univ Calif San Diego, Dept Phys, San Diego, CA 92093 USA

来源：

ASTROPHYSICAL JOURNAL | 1998年 / 499卷 / 02期

关键词：

Galaxy; stellar content; stars; abundances; Population II;

D O I：

10.1086/311360

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The bulge contains the most chemically evolved old stellar population in the Milky Way. Thanks to microlensing, it is now possible to obtain high-resolution echelle spectra of bulge stars near the main-sequence turnoff and study the abundance of elements that are affected by stellar evolution, such as lithium. We have observed with the HIRES spectrograph on the Keck I 10 m telescope the source star of the MACHO microlensing event 97 BLG 45, while it was magnified by similar to 1 mag. Here we report the detection of the Li I line at 6707.8 Angstrom in the echelle spectrum of this star and measure the bulge lithium abundance for the first time: A(Li) = 2.25 +/- 0.25.

引用

页码：L175 / L178

页数：4

共 25 条

[1] The MACHO project: 45 candidate microlensing events from the first-year Galactic bulge data [J].