Large IRAS Shells Around Galactic Wolf-Rayet Stars and the O Star Phase of Wolf-Rayet Evolution

Details Large IRAS Shells Around Galactic Wolf-Rayet Stars and the O Star Phase of Wolf-Rayet Evolution Large IRAS Shells Around Galactic Wolf-Rayet Stars and the O Star Phase of Wolf-Rayet Evolution

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.2828m&link_type=abstract

Astronomical Journal v.112, p.2828

Astronomy and Astrophysics

Astronomy

37

Stars: Wolf-Rayet, Stars: Evolution

Scientific paper

We present IRAS Skyflux images of the environments of galactic Wolf-Rayet stars. These form a complete sample of all galactic Wolf-Rayet stars of the van der Huclit et aL (1981) catalog observed by IRAS, a total of 156 stellar environments. The intent of this survey is to obtain information on the large bubbles expected from the early O star phase of Wolf-Rayet stars. A total of 49 probable or suspected shells of >20' in diameter have been observed in our data, with a detection rate of 60% for large IRAS shells around Wolf-Rayet stars at galactic latitudes >2°. Fourteen of the IRAS shells are associated with previously observed, slowly expanding H I bubbles. Most shells are unlikely to be due to line-of-sight coincidence, although two shells may be associated with foreground or background supernova remnants. In considering the origin of the shells we indicate that most are unlikely to have formed from the explosion of a binary companion to a Wolf-Rayet star and that few, if any, are likely to be associated with ejecta produced in a Roche Lobe overflow. The sizes of the shells, together with their known or estimated expansion velocities are consistent with the estimates of the period of the O star progenitor phase calculated in evolutionary models of single WR stars.

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