Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715312j&link_type=abstract
American Astronomical Society, AAS Meeting #217, #153.12; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We present chemical abundances for 100 red giant branch (RGB) and red clump stars in Plaut's low-extinction window (l,b)=(0°,-8°). The abundances were determined from equivalent width and spectrum synthesis analyses of high resolution (R=22,000), high signal-to-noise (S/N 50-100) spectra obtained with the Blanco 4m telescope and Hydra multifiber spectrograph. We confirm the existence of a vertical metallicity gradient along the Galactic bulge minor axis and that the median metallicity at b=-8° is [Fe/H] -0.3. However, the red clump stars in this field appear to be both selectively enhanced in metallicity, with a median [Fe/H] 0, and have at least a factor of two smaller radial velocity dispersion than the RGB stars. Interestingly, both the giants and clump stars exhibit similar enhanced [alpha/Fe] ratios compared to the thin and possibly thick disk trends, and the b=-8° [alpha/Fe] ratios are indistinguishable from those at b=-4°. Lastly, we compare the abundances of several additional light and heavy elements in Plaut's Window to those in other bulge fields and stellar populations.
Fulbright Jon P.
Johnson Christian I.
Reitzel David B.
Rich Robert Michael
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