Detection of Lithium in a Main Sequence Bulge Star Using Keck I as a 15m Diameter Telescope

Details Detection of Lithium in a Main Sequence Bulge Star Using Keck I as a 15m Diameter Telescope Detection of Lithium in a Main Sequence Bulge Star Using Keck I as a 15m Diameter Telescope

1997-12-03

arxiv.org/abs/astro-ph/9712047v1

Astronomy and Astrophysics

Astrophysics

10 pages, 2 PostScript figures, uses aaspp4.sty. Submitted to The Astrophysical Journal Letters

Scientific paper

10.1086/311360

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 turn-off, 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 10m telescope the source star of the MACHO microlensing event 97BLG45 while it was magnified by about 1 magnitude. Here we report the detection of the Li I line at \lambda 6707.8 \AA in the echelle spectrum of this star, and measure the bulge lithium abundance for the first time: A(Li) = 2.25 \pm 0.25.

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