| This thesis presents studies of high-resolution X-ray spectra of massive stars. Diffraction grating spectrometers onboard the XMM- Newton and Chandra satellite X-ray observatories have revolutionized our understanding of X-ray emission from massive stars, allowing the resolution of individual spectral lines and the study of their Doppler profiles. I discuss the use of line strengths and ratios to constrain temperature distributions, elemental abundances, and distribution of X-ray emitting plasma near a star. I also discuss the interpretation of Doppler profiles in light of their unexpected lack of asymmetry. |
