Synthetic Hertzsprung—Russell diagrams of low-mass stars and the efficiency of colour transformation in determining the open cluster ages

摘要

The scales of the effective temperature Teff and bolometric correction (BC) are necessary for isochrones to be compared with observed colour—magnitude diagrams (CMDs) of star clusters. Reliable scales can be found, providing improved numerical relations between observed and theoretical quantities. A detailed analysis is presented of the effects which the log Teff, B-V and BC scales have on the transformation of evolutionary tracks and time isochrones from the theoretical Hertzsprung—Russell diagram to the CMD. We present a comparison between different scales of published transformations to find the ages of some selected open clusters.