Computer Science
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..272a&link_type=abstract
NOAO Proposal ID #2000B-0272
Computer Science
Scientific paper
We intend to continue our galactic structure and open cluster studies using extended Stromgren CCD photometry of open clusters. While our ``extension'' to the Stromgren system, the hk index, is designed to provide a metallicity index complementary to the traditional m_1 index, one difficult and essential step in disk cluster studies is the determination of foreground reddening. Our completed analyses of two Milky Way ``proof-of-concept'' clusters, open=IC 4651 and globular=NGC 6397, indicate that it is as challenging as we feared! However, the results in NGC 6397 are particularly satisfying because we have made use of both uvby photometry of the red giants and uvbyH(beta) indices for the turnoff stars to derive two independent estimates of the reddening and abundance for the cluster. For the open clusters selected for the coming semester, the current state of the abundance and reddening estimates is significantly more uncertain (and potentially more interesting). These clusters have been selected to augment the still-small sample of anticenter disk clusters delineating the proposed abundance discontinuity near 10 kpc galactocentric distance and the abundance gradient beyond. With well-secured reddening and abundance estimates, galactocentric distance and age will follow.
Anthony-Twarog Barbara
Schuster William
Twarog Bruce A.
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