Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..128g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 128-143.
Astronomy and Astrophysics
Astronomy
44
Charge Coupled Devices, G Stars, Galactic Bulge, Galactic Evolution, Giant Stars, K Stars, Metallicity, Abundance, Color-Magnitude Diagram, Hydrogen, Iron, Stellar Composition, Stellar Spectrophotometry
Scientific paper
Metal abundances accurate to 0.25 dex have been obtained for a large (314) and unbiased sample of G and K giants in Baade's Window from Washington CCD photometry. Good agreement is obtained with the results of Rich based on intermediate resolution spectra of 88 K giants, including the derived metallicities for 15 stars in common. The abundance distribution ranges from about 0.1 to 10 times solar, with a mean Fe/H = +0.17 +/- 0.15, a mean linear abundance of 2.3 +/- 0.5 times solar and a large intrinsic dispersion of about 0.35 dex. A quarter of the sample have Fe/H greater than +0.5, two-thirds exceed the sun's metallicity, and only 8 percent are more metal poor than Fe/H = -0.5. The metallicity distribution function is very well fit by the simple closed box model of Galactic chemical evolution with complete gas consumption.
Friel Eileen D.
Geisler Doug
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