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New WR Central Stars of PNe identified on the AAO/UKST Hα Survey

Published online by Cambridge University Press:  26 May 2016

D. H. Morgan  and
Q. A. Parker
D. H. Morgan
Affiliation:
1 Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK
Q. A. Parker
Affiliation:
1 Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK 2 Dept of Physics, Macquarie University, NSW 2109, Australia

Abstract

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Candidate central stars can be seen in some (≤10%) of the many (~1000) new planetary nebulae found during scans of the AAO/UKST Hα survey of the Milky Way (Parker et al. 2002). Spectroscopic observations have identified seven with Wolf-Rayet emission features, thereby adding significantly to the 56 [WR] central stars already known (Jeffery et al. 1996). Two of these are late-type stars – [WC8] and [WC9-10], and four are early-type around [WC4] or possibly [WO4]. Two of the early-type stars have unusual strong emission features near 4610Å which may be attributed to [N V] and could be indicative of enhanced nitrogen in their atmospheres and unusual stellar evolution. The seventh star is of the [WN] sequence and, if confirmed, would be the only known [WN] central star in the Galaxy. Its surrounding circular nebula has emission lines with expansion velocities exceeding 150 km/s suggesting that the object may not a conventional planetary nebula. The possibility that it is a Population I star with a ring nebula, although looking increasingly less likely, cannot be finally ruled out at this stage. Full details of the [WC] stars have been given by Morgan, Parker, & Russeil (2001) and Parker & Morgan (2002). The candidate [WN] star is described by Morgan & Parker (2002).

Type
Part II: Planetary Nebulae Surveys and their Distribution in Galaxies
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 46
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

Jeffery, C.S. et al. 1996, in ASP Conf. Ser. 96, Hydrogen-deficient Stars, eds Jeffery, C.S. & Huber, U., p471 Google Scholar
Morgan, D.H., Parker, Q.A., Russeil, D., 2001, MNRAS 322, 877 CrossRefGoogle Scholar
Morgan, D.H., Parker, Q.A., 2002, MNRAS, to be submitted Google Scholar
Parker, Q.A., Morgan, D.H., 2002, MNRAS, to be submitted Google Scholar
Parker, Q.A., et al., 2002, these proceedings Google Scholar