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Ejected nebulae as probe of Wolf-Rayet Lyman-continua

Published online by Cambridge University Press:  25 May 2016

Anna Pasquali ,
Paul A. Crowther ,
Werner Schmutz  and
D. John Hillier
Anna Pasquali
Affiliation:
ST-ECF/ESO, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
Paul A. Crowther
Affiliation:
Department of Physics & Astronomy, UCL, Gower Street, London WC1E 6BT, UK
Werner Schmutz
Affiliation:
Institute für Astronomie, ETH Zentrum, Häldeli-Weg 15, Zürich CH-8092, Switzerland
D. John Hillier
Affiliation:
Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh PA 15260, USA

Abstract

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We present the first results from our analysis of WR model atmospheres in the UV domain. Specifically, we test the model atmospheres derived for WR 124 and WR 18 from the Hillier & Miller (1998) and Schmutz (1997) codes through photo-ionization modelling of the associated nebula or H II region. Both codes assume non-LTE and line-blanketing, while photon-loss is implemented only in Schmutz (1997) code. The comparison of the predicted nebular properties with observations indicates that: (i) line-blanketing is essential in reconciling the stellar and nebular properties of WR stars; and (ii) in the case of WR 18 the inclusion of photon-loss produces a slightly more ionized nebula than observed. However, the effect of different model properties such as mass-loss rate has still to be investigated.

Type
Part 3. Interaction of Wolf-Rayet stars and other hot massive stars with their environment: colliding winds and ring nebulae
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 380 - 381
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

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