Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11137m&link_type=abstract
HST Proposal ID #11137. Cycle 16
Physics
Scientific paper
M 1-67 is the youngest known ejection nebula surrounding a Population I Wolf-Rayet star, in this case the WN8 star WR 124. Our deep H-alpha HST/WFPC2 image of this object in March 1997 revealed, for the first time in such a nebula, numerous bright, mostly unresolved knots typical diameters 0.1-0.2" often surrounded by what appear to be their own local spherical diffuse 'wind' bubbles. We propose to obtain a second epoch H-alpha image of M 1-67, essentially repeating the Epoch1 instrumental set-up. By measuring the proper motions of the knots, we will derive a relatively precise and assumption-free geometric distance thus also a luminosity to a Galactic Wolf-Rayet star, the first of its kind. This will help to confirm the suspected runaway status of WR 124 and shed new light on the nature of progenitors of gamma-ray bursts. Moreover, we intend to document and measure the anticipated morphology/brightness changes in the fine-stucture features of the nebula over the 11-year interval, as they relate to wind-embedded shocks. This will provide important input for interaction models of a stellar wind with circumstellar matter.;
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