Newly Discovered Wolf-Rayet and Weak Emission-Line Central Stars of Planetary Nebulae

Details Newly Discovered Wolf-Rayet and Weak Emission-Line Central Stars of Planetary Nebulae Newly Discovered Wolf-Rayet and Weak Emission-Line Central Stars of Planetary Nebulae

2011-01-13

arxiv.org/abs/1101.2468v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

19 pages, 5 figures, 4 tables, accepted for publication in MNRAS

Scientific paper

We present spectra of 32 previously unpublished confirmed and candidate Wolf-Rayet ([WR]) and weak emission-line (WELS) central stars of planetary nebulae (CSPNe). Eighteen stars have been discovered in the Macquarie/AAO/Strasbourg H-Alpha (MASH) PN survey sample, and we have also uncovered 14 confirmed and candidate [WR]s and WELS among the CSPNe of previously known PNe. Spectral classifications have been undertaken using both the Acker & Neiner and Crowther, De Marco & Barlow schemes. Twenty-two members in this sample are identified as probable [WR]s; the remaining 10 appear to be WELS. Observations undertaken as part of the MASH spectroscopic survey have now increased the number of known [WR]s by ~30 per cent. This will permit a better analysis of [WR] subclass distribution, metallicity effects, and evolutionary sequences in these uncommon objects.

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