A high-resolution spectrum of the extremely metal-rich bulge G dwarf OGLE-2006-BLG-265

We present an Keck spectrum of the microlensed Galactic bulge G dwarf OGLE-2006-BLG-265, R p 45,000 which has high (similar to 60) signal-to-noise ratio despite its short ( 15 minute) exposure time, because the source was magnified by. While it is very metal-rich (), the higher temperature of this star compared A similar to 135 [Fe/H] = 0.56 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.