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- W2131937562 abstract "We consider the consequences of appreciable line optical depth for the profile shape of X-ray emission lines formed in stellar winds. The hot gas is thought to arise in distributed wind shocks, and the line formation is predominantly via collisional excitation followed by radiative decay. Such lines are often modelled as optically thin, but the theory has difficulty matching resolved X-ray line profiles. We suggest that for strong lines of abundant metals, newly created photons may undergo resonance scattering, modifying the emergent profile. Using Sobolev theory in a spherically symmetric wind, we show that thick-line resonance scattering leads to emission profiles that still have blueshifted centroids like the thin lines, but which are considerably less asymmetric in appearance. We focus on winds in the constant-expansion domain, and derive an analytic form for the profile shape in the limit of large line and photoabsorptive optical depths. Our theory is applied to published {it Chandra} observations of the O star $zeta$ Pup." @default.
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- W2131937562 date "2000-10-11" @default.
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- W2131937562 title "Exospheric models for the X-ray emission from single Wolf-Rayet stars" @default.
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- W2131937562 doi "https://doi.org/10.1046/j.1365-8711.2000.03744.x" @default.
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