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Atmospheres and Winds of PN Central Stars

Published online by Cambridge University Press:  15 December 2006

R.P. Kudritzki ,
M.A. Urbaneja  and
J. Puls
R.P. Kudritzki
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA email: kud@ifa.hawaii.edu
M.A. Urbaneja
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA email: kud@ifa.hawaii.edu
J. Puls
Affiliation:
Institut für Astronomie und Astrophysik der Universität München, Scheinerstr. 1, 81679 München, Germany
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Abstract

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The progress over the last years in modelling the atmospheres and winds of PN central stars is reviewed. We discuss the effect of the inclusion of the blanketing by millions of metal lines in NLTE on the diagnostics of photospheric and stellar wind lines, which can be used to determine stellar parameters such as effective temperature, gravity, radius, mass loss rate and distance. We also refer to recent work on the winds of massive O-type stars, which indicates that their winds are possibly inhomogeneous and clumped. We investigate implications from this work on the spectral diagnostics of PN central stars and introduce a method to determine wind clumping factors from the relative strengths of H$_{\alpha}$ and He II 4686. Based on new results we discuss the wind properties of CSPN.

Keywords

stars: fundamental parametersstars: windsoutflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 119 - 126
Copyright
© 2006 International Astronomical Union