Initial Results of the Large Legacy zeta Pup Chandra Campaign

A large, multi-wavelength campaign to study the winds of the massive star zeta Pup (O4 I) has begun with the initial 480 kiloseconds of exposure time using Chandra's High Resolution Transmission Grating (HETG) during the summer of 2018. Zeta Pup is a particularly rewarding target for the HETG because its X-ray emission lines show an interesting and detailed structure indicating both Doppler-broadening and absorption due to its stellar wind. X-ray emission line fitting and short timescale variability are discussed and compared to previous results using XMM and Chandra. In contrast to the earlier Chandra observations in 2000, these observations comprise enough exposure time to make meaningful line shape measurements with the High-Energy Grating of the HETG in addition to the Medium-Energy Grating of the HETG used in previous studies. Variability analyses include a discussion of statistical methods and fitting of emission lines in spectrally-resolved short time slices. Multi-wavelength observations which will be added to this project during during the Chandra observations of this star in 2019 will also be discussed