Abstract
view Abstract Citations (135) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Photometry of M67 to M_{v} = +12 Racine, René Abstract New photographic photometry of M67 to the limit of the 2004nch telescope is reported. The reddening and ultraviolet excess of main-sequence stars are L(B - V) = 0.09 * 0.02 p.e., (U - B) = +0.035 * 0.007 p.e. The (V, B - V) -diagram shows a thinly populated main sequence extending to the limit of the data at V = 20.5, B - V = 1.7. More than half of the M67 main-sequence stars between G2 and KS appear to be unresolved multiple stars. A direct fitting to the Hyades main sequence yields - 3f)Av = 6.69 * 0.05 p.e. (M67-Hyades). The observed population of faint blue objects to V = 22 is similar to the one observed in other high4atitude fields, and no white dwarfs appear to exist in M67 above Aiv = +12.2. The relative evolutionary time scales, inferred from the observed density of stars along the M67 isochrone, is in general agreement with theoretical prediction, but the detailed shape of the isochrone disagrees with model calculations. Publication: The Astrophysical Journal Pub Date: September 1971 DOI: 10.1086/151095 Bibcode: 1971ApJ...168..393R full text sources ADS | data products SIMBAD (220)
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