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We fit the Doppler profiles of the He-like triplet complexes of \ion{O}{7}and \ion{N}{6} in the X-ray spectrum of the O star $\zeta$ Puppis, usingXMM-Newton RGS data collected over $\sim 400$ ks of exposure. We find that theycannot be well fit if the resonance and intercombination lines are constrainedto have the same profile shape. However, a significantly better fit is achievedwith a model incorporating the effects of resonance scattering, which causesthe resonance line to become more symmetric than the intercombination line fora given characteristic continuum optical depth $\tau_*$. We discuss theplausibility of this hypothesis, as well as its significance for ourunderstanding of Doppler profiles of X-ray emission lines in O stars.Comment: 29 pages, 8 figures, revised version accepted by Ap

Evidence for the Importance of Resonance Scattering in X‐Ray Emission Line Profiles of the O Star ζ Puppis