Models for x-ray illuminated atmospheres

A numerical scheme has been developed to study plane-parallel stellar atmospheres, with a given surface temperature and gravity, illuminated by a beam of X-rays. For given total flux, spectrum, and angle of incidence of the X-ray beam, the structure of the atmosphere and the characteristics of the outgoing radiation are calculated. The scheme is applicable to binary systems in which one member is a compact X-ray source and the other is a normal star. The results are presented for a few models with different values of the input parameters