Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.8814k&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #88.14; Bulletin of the American Astronomical Society, Vol. 31, p.1507
Astronomy and Astrophysics
Astronomy
Scientific paper
A number of Galactic Wolf-Rayet stars show multiple shells of swept-up material surrounding the central stars. These shells are thought to result from various evolutionary phases of the progenitor stars as well as strong stellar winds from Wolf-Rayet stars themselves. IRAS has detected large (> 20') shells around several Wolf-Rayet stars, which are thought to be caused by wind-blown bubbles from the O star progenitor phase. However, the resolution limitations of IRAS precludes the detecting of smaller shells which may have formed during the post O star phases. The Midcourse Space Experiment (MSX) Galactic Plane Survey provides sensitive, high resolution ( 18''), mid-IR (6-26 μ m) data capable of resolving these smaller structures. We present images of several Wolf-Rayet stars with large IRAS shells and the evidence for these smaller shells. These smaller shells are conjectured to be caused by ejecta or stellar winds from the Wolf-Rayet stars. Their detection will provide data on the duration of these phases and provide limits on the time scales of the evolutionary phases of these high mass stars.
Carey Sean Joseph
Kuchar Thomas A.
Price Stephan D.
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