Carbon stars with increased oxygen and nitrogen abundances: hydrostatic dust-free model atmospheres

Bernhard Aringer, Paola Marigo, Walter Nowotny +3

We have computed a grid of hydrostatic spherical COMARCS models for C stars covering metallicities from [Z/H]=0 to -2 and values of the carbon excess [C-O] from 6.41 to 9.15, plus…