Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..561m&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 677, July 1992, p. 561-573. Research supported
Astronomy and Astrophysics
Astronomy
9
Charge Coupled Devices, Main Sequence Stars, Stellar Evolution, Stellar Spectrophotometry, Color-Magnitude Diagram, Heavy Elements, Metallicity, Ubv Spectra
Scientific paper
CCD frames on the uvby system of a field in Omega Centauri are obtained and analyzed in order to constrain the intrinsic dispersion of heavy elements among its unevolved stars. Results from direct measurements on the metallicity using m1 and from indirect measures using the color spread in (b-y) near the turnoff imply an intrinsic dispersion in Fe/H of about 1 dex, similar to the results of spectroscopic analysis of the evolved stars. The color spread near the turnoff is consistent with little spread in age, though the constraint is weak. The variable blue straggler E39 is recovered showing an additional blue-straggler candidate. The variation in c1 as a function of magnitude for probable upper-main-sequence members suggests that previous evolutionary corrections for metal-poor stars were overestimated.
Anthony-Twarog Barbara J.
Mukherjee Krishna
Twarog Bruce A.
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