2010MNRAS.401.1760S -
Mon. Not. R. Astron. Soc., 401, 1760-1769 (2010/January-3)
The optical emission nebulae in the vicinity of WR 48 (Θ Mus): true Wolf-Rayet ejecta or unconnected supernova remnant?
STUPAR M., PARKER Q.A. and FILIPOVIC M.D.
Abstract (from CDS):
During searches for new optical Galactic supernova remnants (SNRs) in the high-resolution, high-sensitivity Anglo-Australian Observatory/United Kingdom Schmidt Telescope Hα survey of the southern Galactic plane, we uncovered a variety of filamentary and more diffuse, extensive nebular structures in the vicinity of Wolf-Rayet (WR) star 48 (θ Muscae), only some of which were previously recognized. We used the double-beam spectrograph of the Mount Stromlo and Siding Spring Observatory 2.3-m to obtain low- and mid-resolution spectra of selected new filaments and structures in this region. Despite spectral similarities between the optical spectra of WR star shells and SNRs, a careful assessment of the new spectral and morphological evidence from our deep Hα imagery suggests that the putative shell of θ Mus is not a WR shell at all, as has been commonly accepted, but is rather part of a more complex area of large-scale overlapping nebulosities in the general field of the WR star. The emission comprises a possible new optical SNR and a likely series of complex Hii regions. Finally, we present the intriguing detection of apparent collimated, directly opposing, ionized outflows close to θ Mus itself which appears unique among such stars.
Abstract Copyright:
© 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s):
stars: individual (WR 48, HD 113904, θ Muscae) - stars: winds, outflows - stars: Wolf-Rayet - Hii regions - ISM: individual: G304.4-3.1 - supernova remnants
Simbad objects:
14
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