Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..515c&link_type=abstract
Astronomical Journal, vol. 84, Apr. 1979, p.515-517, 519 (12 ff.). Research supported by Harvard University
Astronomy and Astrophysics
Astronomy
49
Astronomical Photometry, Electrophotometry, Globular Clusters, Hertzsprung-Russell Diagram, Ubv Spectra, Color-Magnitude Diagram, Interstellar Extinction, Main Sequence Stars, Spectrograms, Tables (Data)
Scientific paper
UBV photoelectric and photographic photometry of the southern globular cluster NGC 6752 are presented. The photoelectric sequence is extended to a point about 1 mag below the main-sequence turnoff. A cluster color-magnitude diagram, uncorrected for reddening, is plotted which shows that: (1) the RR Lyrae gap is unpopulated except for one short-period W Vir star that lies above the horizontal branch; (2) the horizontal-branch stars apparently lie mostly to the blue of the instability strip; (3) the slope of the giant branch is about 5.0, implying an intermediate metal deficiency; (4) the main-sequence turnoff occurs at V = 17.30 + or - 0.05 and B-V = 0.425 + or - 0.010; (5) the main sequence appears to be very broad, probably as a result of errors in the photographic photometry; and (6) the normalized UV excess of the main-sequence stars is 0.22 mag, indicative of a metallicity (Fe/H) of about -1.5.
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