Astrophysical Parameters of Distant Anticenter Open Clusters and the Radial Metallicity Gradient in the Galactic Disk

Details Astrophysical Parameters of Distant Anticenter Open Clusters and the Radial Metallicity Gradient in the Galactic Disk Astrophysical Parameters of Distant Anticenter Open Clusters and the Radial Metallicity Gradient in the Galactic Disk

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop...62c&link_type=abstract

NOAO Proposal ID #2000B-0062

Astronomy and Astrophysics

Astrophysics

Scientific paper

Open clusters have long been used as tracers of the evolution of the Galactic disk. Recent studies have provided accurate reddenings, distances and ages for a sample of more than 30 previously unstudied old and intermediate-age open clusters. These clusters cover a galactocentric distance range from ~ 4 kpc to ~ 16 kpc and no metal abundance determination has yet been reported for most of them. We propose to derive metallicities for this sample in order to study the radial metallicity gradient at very large Galactocentric distances. The Washington photometry is an efficient technique for assigning metallicities of red giant stars mainly for two reasons: (1) It is fast enough so that clusters at astrophysically interesting distances can be investigated with small telescopes. (2) Revised abundance calibrations for this system, which represent significant improvements over previous calibrations, have been established by Geisler et al. (1991) and Geisler and Sarajedini (1999). We propose to observe some selected summer-sky clusters with the C,M,T_1,T_2 filters mainly to determine their metallicities. Washington photometry allow us to obtain CMDs from which basic cluster parameters can be derived (Geisler and Sarajedini 1999). We also propose to observe with the UBVI filters compact clusters previously observed spectroscopically at CASLEO. The combined photometric and spectroscopic data will add important information to our understanding of the chemical evolution of the Galactic disk, in particular of the radial abundance gradient.

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