Galactic Structure from Open Clusters: Photometric Characterization of Reddening, Distance and Abundance

Details Galactic Structure from Open Clusters: Photometric Characterization of Reddening, Distance and Abundance Galactic Structure from Open Clusters: Photometric Characterization of Reddening, Distance and Abundance

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...81a&link_type=abstract

NOAO Proposal ID #1999A-0081

Physics

Scientific paper

Our recent work with open clusters has indicated a surprising demarcation of the Milky Way disk's metallicity as a function of distance from the Galactic center - an apparently abrupt drop in [Fe/H] from solar to -0.3 at R_GC=10 kpc (Twarog, Ashman & Anthony- Twarog 1997). We have asserted that due to uncertain reddenings, distances and abundance data, the step-down in [Fe/H] at 10 kpc has long been masked in previous studies or interpreted as a declining radial gradient in the disk's metallicity. Current work, including observations proposed here, will address these issues for disk clusters by using uvbyCaH(beta) photometry to determine foreground reddenings, abundances and cluster distances.

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