Bulletin de la Société Royale des Sciences de Liège

0037-9565 1783-5720

 

sinds 05 februari 2011 :
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Diana Pasemann, Ute Rühling & Wolf-Rainer Hamann

Spectral analyses of the Wolf-Rayet stars in the Small Magellanic Cloud

(Volume 80 - Année 2011)
Article
Open Access

Abstract

We have performed spectral analyses of all known Wolf-Rayet stars (single or binary) in the SMC. For this purpose, we have employed the Potsdam Wolf-Rayet (PoWR) model atmosphere code. For the 11 WR stars of the nitrogen sequence (WN), we calculated four grids of models with different hydrogen abundances. Furthermore, we established a series of O-star models, in order to construct the composite spectra of WN+ Obinaries. The only WO-type (i.e. oxygen-sequence WR) star in the SMC was also analyzed with the help of an adequate grid of models. The preliminary results are in a rough agreement with the expectation, considering the lower mass loss in the SMC’s metal-poor environment. In conflict with the evolutionary models is the high hydrogen abundance found in the single WN stars. The low luminosity of one WN star (SMC AB2) is also not explainable.

Om dit artikel te citeren:

Diana Pasemann, Ute Rühling & Wolf-Rainer Hamann, «Spectral analyses of the Wolf-Rayet stars in the Small Magellanic Cloud», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 80 - Année 2011, 180 - 184 URL : http://popups.ulg.be/0037-9565/index.php?id=2668.

Over : Diana Pasemann

Universität Potsdam, Germany

Over : Ute Rühling

Universität Potsdam, Germany

Over : Wolf-Rainer Hamann

Universität Potsdam, Germany