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New, high-resolution MARCS synthetic spectra have been calculated for morethan a dozen mixtures of the metals allowing, in turn, for variations in C:N:O,[CNO/Fe], and enhanced abundances of C, O, Mg, and Si. Bolometric Corrections(BCs) for many of the broad-band filters currently in use have been generatedfrom these spectra. Due to improved treatments of molecules that involve atomsof C, N, and O, the BCs for UV and blue passbands, in particular, differsubstantially from those derived from previous MARCS models. These differences,and the effects on BCs of varying the abundances of the metals, are shown in anumber of instructive plots. Stellar evolutionary grids for -2.5 <= [Fe/H] <=-0.5 have also been computed for the different mixtures. Isochrones based onthese tracks are intercompared on the theoretical H-R diagram and on a few ofthe colour-magnitude diagrams that can be constructed from HST Wide FieldCamera 3 (WFC3) F336W, F438W, F606W, F814W, F110W, and F160W observations. Forthe first application of these models, isochrones have been fitted to WFC3photometry of the globular cluster NGC 6496 from the HST UV Legacy Survey, withvery encouraging results.

monthly notices of the royal astronomical society

Models of Metal-Poor Stars with Different Initial Abundances of C, N, O,  Mg, and Si. I. Bolometric Corrections Derived from New MARCS Synthetic  Spectra and Their Implications for Observed Colour-Magnitude Diagrams