Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1504a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, May 1990, p. 1504-1535.
Astronomy and Astrophysics
Astronomy
64
Binary Stars, Charge Coupled Devices, Open Clusters, Stellar Spectrophotometry, Abundance, Color-Magnitude Diagram, Interstellar Extinction, Main Sequence Stars, Metallicity, Red Giant Stars, Stellar Evolution
Scientific paper
Precision CCD photometry on the BV system of the core of the old open cluster NGC 2420 is analyzed to explore the value of such an approach for open clusters, particularly in the areas of Galactic and stellar evolution. The unevolved main sequence is shown to be narrow and well defined to the completeness limit of V = 18.5, and the distribution of stars away from the main sequence is shown to be bimodal, with a secondary peak located approximately 0.7 mag above the fiducial main sequence. It is estimated that 50 percent of the cluster systems are binary. Near the turnoff the cluster exhibits some detailed structure. Fiducial relations are given for the cluster extending from the lower main sequence to the red giant branch 1.5 mag above the clump. Comparisons are made between the NGC 2420 cluster and NGC 2506, the isochrones of VandenBerg (1985), and 47 Tuc, in order to estimate cluster parameters, including reddening and metallicity.
Anthony-Twarog Barbara J.
Kaluzny Janusz
Shara Michael M.
Twarog Bruce A.
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