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Measuring mass-loss rates and constraining shock physics using X-ray line profiles of O stars from the Chandra archive
David H. Cohen, Emma E. Wollman, Maurice A. Leutenegger +4
We quantitatively investigate the extent of wind absorption signatures in the X-ray grating spectra of all non-magnetic, effectively single O stars in the Chandra archive via line…
Chandra X-ray spectroscopy of the very early O supergiant HD 93129A: constraints on wind shocks and the mass-loss rate
David H. Cohen, Marc Gagné, Maurice A. Leutenegger +5
We present analysis of both the resolved X-ray emission line profiles and the broadband X-ray spectrum of the O2 If* star HD 93129A, measured with the Chandra HETGS. This star is a…
X-ray spectral diagnostics of activity in massive stars
David H. Cohen, Emma E. Wollman, Maurice A. Leutenegger
X-rays give direct evidence of instabilities, time-variable structure, and shock heating in the winds of O stars. The observed broad X-ray emission lines provide information about…
A mass-loss rate determination for zeta Puppis from the quantitative analysis of X-ray emission line profiles
David H. Cohen, Maurice A. Leutenegger, Emma E. Wollman +4
We fit every emission line in the high-resolution Chandra grating spectrum of zeta Pup with an empirical line profile model that accounts for the effects of Doppler broadening and…