High Resolution X-ray Spectroscopy of Zeta Puppis

Zeta Pup is the prototypical star for studies of winds in hot stars. It shows rotationally modulated variations in both the total flux and lin widthspresumably due to inhomogeneities on the stellar surface and in the atmosphericdensities, and intrinsic instabilities in the wind structure. We will observeZeta Pup during the PV program in order to test the RGS capability to resolvevelocity fields and bulk motion.