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The main sequence of the globular cluster NGC 6752
UBV photoelectric and photographic photometry of the southern globularcluster NGC 6752 are presented. The photoelectric sequence is extendedto a point about 1 mag below the main-sequence turnoff. A clustercolor-magnitude diagram, uncorrected for reddening, is plotted whichshows that: (1) the RR Lyrae gap is unpopulated except for oneshort-period W Vir star that lies above the horizontal branch; (2) thehorizontal-branch stars apparently lie mostly to the blue of theinstability strip; (3) the slope of the giant branch is about 5.0,implying an intermediate metal deficiency; (4) the main-sequence turnoffoccurs at V = 17.30 + or - 0.05 and B-V = 0.425 + or - 0.010; (5) themain sequence appears to be very broad, probably as a result of errorsin the photographic photometry; and (6) the normalized UV excess of themain-sequence stars is 0.22 mag, indicative of a metallicity (Fe/H) ofabout -1.5.
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