Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-30
Astrophys.J.655:L33-L36,2007
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, submitted to ApJ Letters
Scientific paper
10.1086/511750
We present an R=45,000 Keck spectrum of the microlensed Galactic bulge G-dwarf OGLE-2006-BLG-265, which has a high (~60) signal-to-noise ratio despite its short (15 min) exposure time because the source was magnified by A~135. While it is very metal-rich ([Fe/H]=0.56), the higher temperature of this star compared with the luminous red giants usually measured in the bulge gives its spectrum many unblended atomic lines. We measure the abundances of 17 elements, including the first abundances for S and Cu in a bulge star. The [alpha/Fe] ratios are subsolar, while the odd-Z elements are slightly supersolar, trends that are also seen in the more metal-rich stars in the bulge and the local Galactic disk. Because the star is a dwarf, the [O/Fe], [Na/Fe], and [Al/Fe] ratios cannot be attributed to internal mixing, as is sometimes claimed for giants. Similar high-resolution spectra could be obtained for about a dozen bulge dwarf stars per year by means of well-designed target-of-opportunity observations.
Gal-Yam Avishay
Gould Andrew
Johnson Jennifer A.
Leonard Douglas C.
Simon Joshua D.
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