Spectral Diagnostics of the Hot Plasma in the Stellar Wind of epsilon CMa

We propose using RGS spectra of epsilon CMa (B2 II) to address several outstanding questions about the Xray production mechanism in hotstar winds. These include: (1) Can selfexcited instabilities produce shock emission consistent with observations or are clumpclump collisions required (2) What are the temperature and density distributions in the shocked plasma, and what type of wind dynamics are required to produce these distributions (3) What is the spatial distribution of the shocked plasma, and what is the impact of the Xrays on the ambient wind And (4) how variable are the properties of the individual spectral features and the physical properties which they diagnose. Epsilon CMa has a normal wind, and is the only hot star for which EUVE SW spectra exist. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]