UvbyH-beta photoelectric and CCD photometry of IC 4651

Details UvbyH-beta photoelectric and CCD photometry of IC 4651 UvbyH-beta photoelectric and CCD photometry of IC 4651

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1222a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Nov. 1987, p. 1222-1236.

Astronomy and Astrophysics

Astronomy

43

Astronomical Photometry, Electrophotometry, H Beta Line, Star Clusters, Binary Stars, Charge Coupled Devices, Color-Magnitude Diagram, Interstellar Extinction, Main Sequence Stars, Metallicity, Red Giant Stars, Southern Sky, Variable Stars

Scientific paper

uvbyHβ photoelectric and CCD photometry of the old, open southern cluster IC 4651 is presented and analyzed. The combined data lead to the following cluster characteristics: E(b-y) = 0.064±0.006, [Fe/H] = +0.23±0.02, (m-M)0 = 9.83±0.04, and an age on the system of VandenBerg (1985) of 2.4±0.2×109yr. The cluster color-magnitude diagram exhibits some scatter, all of which can be explained by binaries, non-members, and a blueward hook due to the hydrogen-exhaustion phase. The cluster turnoff shows marginal evidence for the presence of bimodality found in NGC 752, a younger and more metal-poor cluster. It is speculated that the bimodality is the result of nonstandard evolution near the Böhm-Vitense gap.

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