Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1056a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 1056-1069. Research supported by University of Kansas.
Astronomy and Astrophysics
Astronomy
38
Astronomical Photography, Charge Coupled Devices, Color-Magnitude Diagram, Open Clusters, Red Giant Stars, Astronomical Models, Sky Surveys (Astronomy), Stellar Evolution
Scientific paper
Results are presented of a photographic, photoelectric, and CCD survey on the BV system in the intermediate-age open cluster, NGC 3680. Direct tests demonstrate significant magnitude-dependent differences between the photometry of Eggen (1969) and the standard BV system. The cluster contains a well-defined red giant clump, but the turnoff region exhibits scatter noticeably larger than expected from the derived errors. The apparent luminosity function of the cluster shows a dramatic decline in probable cluster members below 1 solar mass when compared to counts for this region of the sky based upon Galactic models. Comparison with the theoretical isochrones of VB85 produces an age of 1.9 x 10 to the 9th yr with a large uncertainty depending upon the choice of luminosity or color as the primary age estimator.
Anthony-Twarog Barbara J.
Caldwell Nelson
Heim Eric A.
Twarog Bruce A.
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