BV photographic and CCD photometry of IC 4651

Details BV photographic and CCD photometry of IC 4651 BV photographic and CCD photometry of IC 4651

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1453a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, May 1988, p. 1453-1465.

Astronomy and Astrophysics

Astronomy

40

Astronomical Photometry, Charge Coupled Devices, Giant Stars, Main Sequence Stars, Open Clusters, Electrophotometry, Red Giant Stars

Scientific paper

A BV photometric survey in IC 4651 based on photographic and CCD material calibrated with photoelectric photometry from Eggen (1971) and Anthony-Twarog and Twarog (1987) has been completed. The color-magnitude diagram is consistent with an age of 2.4 + or - 0.3 x 10 to the 9th yr derived by comparison with the isochrones of VandenBerg (1985) if the apparent distance modulus and reddening derived from uvby photometry in Anthony-Twarog and Twarog (1987) are employed. While evidence is found of a hook in the upper main sequence, no evidence is found of a significantly bifurcated main sequence for this cluster, although it is similar in age to NGC 752 and NGC 3680, where this phenomenon has been noted. Finally, the survey has not resolved the apparent deficit of main-sequence stars fainter than V = 14.5 noted in Anthony-Twarog and Twarog (1987).

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