CCD ubvy photometry of the bimodal main-sequence cluster NGC 3680

Details CCD ubvy photometry of the bimodal main-sequence cluster NGC 3680 CCD ubvy photometry of the bimodal main-sequence cluster NGC 3680

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1634a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Nov. 1989, p. 1634-1642. Research supported by the University of Kansas.

Astronomy and Astrophysics

Astronomy

35

Astronomical Photometry, Charge Coupled Devices, Main Sequence Stars, Open Clusters, Ubv Spectra, Chronology, Color-Magnitude Diagram, Sky Surveys (Astronomy)

Scientific paper

CCD uvby photometry for the intermediate age, southern open cluster, NGC 3680, is analyzed. For a reddening of E(b-y) = 0.034, a true cluster modulus of 9.74 + or - 0.20 and a cluster metallicity of Fe/H abundance = 0.10 + or - 0.09, based on 18 probable nonbinary members of the cluster brighter than V = 14. The color-magnitude diagram for the cluster suggests that, although the main sequence may be subject to the same bimodal distibution as NGC 752, the likely source in both clusters is a combination of binaries and a sharply curved turnoff. The color-magnitude diagram is compared to the theoretical isochrones of Bertelli et al. (1988), showing an age of (1.9 + or - 0.3) X 10 to the 9th yr.

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