A High-Resolution Spectrum of the Extremely Metal-rich Bulge G Dwarf OGLE-2006-BLG-265

We present an R=45,000 Keck spectrum of the microlensed Galactic bulgeG-dwarf OGLE-2006-BLG-265, which has a high (~60) signal-to-noise ratio despiteits 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 starcompared with the luminous red giants usually measured in the bulge gives itsspectrum 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, trendsthat are also seen in the more metal-rich stars in the bulge and the localGalactic 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 forgiants. Similar high-resolution spectra could be obtained for about a dozenbulge dwarf stars per year by means of well-designed target-of-opportunityobservations.Comment: 5 pages, 2 figures, submitted to ApJ Letter