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Overloaded and fractured stellar winds

Published online by Cambridge University Press:  26 May 2016

Achim Feldmeier ,
Lida M. Oskinova ,
Wolf-Rainer Hamann  and
Stanley P. Owocki
Achim Feldmeier
Affiliation:
Lehrstuhl Astrophysik, Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam, BRD
Lida M. Oskinova
Affiliation:
Lehrstuhl Astrophysik, Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam, BRD
Wolf-Rainer Hamann
Affiliation:
Lehrstuhl Astrophysik, Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam, BRD
Stanley P. Owocki
Affiliation:
Bartol Research Institute, University of Delaware, 217 Sharp Laboratory, Newark, DE 19716, USA

Abstract

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We discuss the connection between wind overloading and discrete absorption components in P-Cygni line profiles from O-type stars. Overloading can create horizontal plateaus in the radial wind speed that cause the extra absorption in the line profile. The upstream propagation speed of these velocity plateaus is analyzed. The second part of the paper deals with X-ray emission from O-type stars. X-ray line profiles observed with Chandra and XMM-Newton are often symmetric, contrary to what is expected for lines from a homogeneous wind. We discuss the influence on line symmetry of photon escape channels in a strongly clumped wind.

Type
Part 1. Atmospheres of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 56 - 60
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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