CCD UBVR photometry of two old open clusters: King 11 and Be42 - Comparison with theoretical models

Details CCD UBVR photometry of two old open clusters: King 11 and Be42 - Comparison with theoretical models CCD UBVR photometry of two old open clusters: King 11 and Be42 - Comparison with theoretical models

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...88..155a&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 88, no. 1, April 1991, p. 155-175. Research supported by ASI

Mathematics

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Astronomical Photometry, Color-Magnitude Diagram, Open Clusters, Stellar Structure, Charge Coupled Devices, Metallicity, Red Shift, Stellar Evolution, Stellar Models

Scientific paper

This paper presents the Johnson-Cousins UBVR CCD photometry of two old rich open clusters toward the galactic anticenter: King 11 and Be 42. Included are the color-magnitude (C-M) diagrams of King 11 and Be 42; the color excess; and the reddening, metallicity, and distance modulus of the two clusters. Also given are the ages of King 11 and Be 42, as determined from the turn-off luminosity by means of theoretical isochromes, and the results for the luminosity function and the present-day mass function of the two clusters, derived from star counts in the V(V - R) C-M diagrams. The C-M diagram of King 11 is discussed in detail with the aid of models incorporating convective overshoot, according to the revised prescription proposed by Aparicio et al. (1990). It is shown that these models fit the overall morphology of the C-M diagram of King 11 much better than does the Bressan et al. (1981) model.

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