Assigned ID: 618 ----- Submission 1 (Fri Jan 21 19:35:13 GMT 2005) ----- We propose to implement plasma emission calculations into our widely used stellar atmophere code (CMFGEN) to treat all relevant spectral regions, X-rays, UV, optical, and IR self-consistently. This new version of CMFGEN will allow the stellar community to maximize the information return from modelling efforts and utilize all available observations simultaneously. The enhanced version will also help to clarify the effects that X-rays have on the ionization state of the cool wind and allow for the correct interpretation of STIS and GHRS spectra of wind-sensitive lines. X-rays, via Auger ionization, are important in high density winds because they produce observable quantities of super-ions, like N V and O VI. On the other hand, preliminary results show that X-rays dominate the wind ionization balance in OB stars with low mass-loss rates. X-ray ionization MUST be considered in such stars if mass-loss rates and abundances are to be correctly inferred from UV wind lines. Accurate mass-loss rates are crucial for stellar evolution calculations, while abundances provide invaluable insights into stellar evolution.

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