Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A search for Ejecta Nebulae around Wolf-Rayet Stars using the SHS
  H$\alpha$ survey   Recent large scale Galactic Plane H$\alpha$ surveys allow a re-examination of
the environs of Wolf-Rayet (WR) stars for the presence of a circumstellar
nebula. Using the morphologies of WR nebulae known to be composed of stellar
ejecta as a guide, we constructed ejecta nebula criteria similar to those of
Chu (1991) and searched for likely WR ejecta nebula in the SHS H$\alpha$
survey. A new Wolf-Rayet ejecta nebula around WR 8 is found and its morphology
discussed. The fraction of WR stars with ejecta type nebulae is roughly
consistent between the MilkyWay (MW) and LMC at around 5-6%, with the MW sample
dominated by nitrogen rich WR central stars (WN type) and the LMC stars having
a higher proportion of carbon rich WR central stars (WC type). We compare our
results with those of previous surveys, including those of Marston (1997) and
Miller & Chu (1993), and find broad consistency. We investigate several trends
in the sample: most of the clear examples of ejecta nebulae have WNh central
stars; and very few ejecta nebulae have binary central stars. Finally, the
possibly unique evolutionary status of the nebula around the binary star WR 71
is explored.

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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th