Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..227r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 1, 1984, p. 227-234. Research supported by the Natural Sciences a
Astronomy and Astrophysics
Astrophysics
83
Abundance, Globular Clusters, Main Sequence Stars, Stellar Evolution, Stellar Spectrophotometry, Ubv Spectra, Charge Coupled Devices, Color-Color Diagram, Color-Magnitude Diagram, Distance, Interstellar Extinction, Metallicity, Stellar Color, Stellar Magnitude
Scientific paper
Color-magnitude and color-color diagrams have been constructed for a 4 x 3-arcmin field of the globular cluster M4, on the basis of deep UBV CCD images. The color-magnitude diagram indicates that the main sequence, down to almost 3 mag below the turnoff, has an intrinsic width no greater than + or 0.02 mag in (B-V), implying either that the variation in He abundance in these stars must be less than + or - 0.07, or that the fractional variation in metallicity is not larger than + or - 0.22. Field stars in the direction of the cluster yield E(B-V) of 0.37 + or - 0.06, while the best present metallicity estimate for M4 is -0.93 + or - 0.31. The corresponding isochrones from VandenBerg (1983) are found to be in excellent general agreement with the present data.
Fahlman Gregory G.
Richer Harvey B.
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