Metal enriched X-ray bursting neutron star atmos.

In some cases the burning ashes may rise from the burning depths up to the NS photosphere by convection, leading to the appearance of the metal absorption edges in the spectra, which then force the emergent X-ray burst spectra to shift toward lower energies.

These effects may have a substantial impact on the color correction factor fc and the dilution factor w, the parameters of the diluted blackbody model F_E_=wB_E_(f_c_T_eff_) that is commonly used to describe the emergent spectra from NSs. The aim of this paper is to quantify how much the metal enrichment can change these factors. We have developed a new NS atmosphere modeling code, which has a few important improvements compared to our previous code required by inclusion of the metals.