Opacity of Hot and Dense Stellar Material: Flexible for Changes in Composition and Abundance

Opacity of stellar materials with the composition and relative abundance specified according to sun has been calculated by using an average-atom scheme, which is designed to treat electronic structures of atoms and ions in a mixture. Different relative abundances of the metallic elements are considered. Comparisons between the present results and those of OPAL are made for the opacity to show that the difference is less than 10% for most cases and less than 30% for the largest point with the density of 1.0 g/cm3 and temperatures from 50 to 6000 eV. In view of the simplicity of the present approach, it is quite flexible to apply the method to different models of the stellar materials with changes in composition as well as in relative abundance.