Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..372l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 372-379.
Astronomy and Astrophysics
Astrophysics
72
Early Stars, Line Spectra, Resonance Lines, Stellar Winds, Angular Distribution, Astronomical Models, Kinematics, Shock Wave Propagation, Stellar Envelopes
Scientific paper
A theory of line formation in locally nonmonotonic winds is applied to resonance doublets with components sufficiently separated that they interact only nonlocally. For a particular kinematic model of a wind's small-scale chaotic motions, computed P Cygni profiles in the strong-line and multiply nonmonotonic limits have black absorption troughs whose widths at zero intensity exceed the components separations by an amount equaling the velocity amplitude of the chaotic motions in the terminal flow. Applied to observed profiles, this readily measured diagnostic yields typical chaotic motions in the outer parts of the winds of Zeta Puppis (O4f) and HD 93131 (WN7) of 500 and 1000 km/sec, respectively. These estimates provide further support for the suggestion that the X-ray emission of early-type stars originates in the cooling zones of strong, radiatively driven shocks propagating throughout their winds.
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