Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..634n&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, March 1987, p. 634-646. Research supported by the Statens Naturvidenskabelige Fo
Astronomy and Astrophysics
Astronomy
139
Astronomical Photometry, Main Sequence Stars, Star Clusters, Ubv Spectra, Binary Stars, Color-Magnitude Diagram, G Stars, Interstellar Extinction, Late Stars, Metallicity, Stellar Luminosity
Scientific paper
uvbyHβ photometry of main-sequence stars in M67 is presented and analysed. The cluster is found to have E(b-y) = 0.023±0.004, [Fe/H] = -0.06±0.07, (V-Mv)0 = 9.61±0.04, and an age of 5.0±0.5×109yr on the system of VandenBerg (1985). In deriving the cluster parameters, it is demonstrated that the binaries tend to have higher reddening, that the late F and early G stars require inclusion of a luminosity correction in the metallicity calibration, and that a strong temperature dependence exists in the δMv-δc0 relation, with the slope reaching f = 17 for the early G stars. The cm diagram above the main-sequence gap is dominated by binaries, while a paucity appears to exist below it. The turnoff shows clear evidence of a blueward hook. No evidence is found for an intrinsic spread in color on the main sequence below the gap.
Crawford David L.
Nissen Poul Erik
Twarog Bruce A.
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