Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/91512
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- Title
- Binary planetary nebulae nuclei towards the Galactic bulge : II. A penchant for bipolarity and low-ionisation structures
- Related
- Astronomy and astrophysics, Vol. 505, No. 1 (2009), p.249-263
- DOI
- 10.1051/0004-6361/200912176
- Publisher
- EDP Sciences
- Date
- 2009
- Author/Creator
- Miszalski, B
- Author/Creator
- Acker, A
- Author/Creator
- Parker, Q. A
- Author/Creator
- Moffat, A. F. J
- Description
- Considerable effort has been applied towards understanding the precise shaping mechanisms responsible for the diverse range of morphologies exhibited by planetary nebulae (PNe). At least 10–20% of PNe have central stars (CSPN) with a close binary companion thought responsible for heavily shaping the ejected PN during common-envelope (CE) evolution, however morphological studies of the few available examples found no clear distinction between PNe and post-CE PNe. The discovery of several new binary central stars (CSPN) from the OGLE-III photometric variability survey has significantly increased the number of post-CE PNe available for morphological analysis to 30 PNe. High quality Gemini South narrow-band images are presented for most of the OGLE sample, while some previously known post-CE PNe are reanalysed with images from the literature. Nearly 30% of nebulae have canonical bipolar morphologies, however this could be as high as 60% once inclination effects are incorporated with the aid of geometric models. This is the strongest observational evidence yet linking CE evolution to bipolar morphologies. A higher than average proportion of the sample shows low-ionisation knots, filaments or jets suggesting they have a binary origin. These features are also common in nebulae around emission-line nuclei which may be explained by speculative binary formation scenarios for H-deficient CSPN.
- Description
- 15 page(s)
- Subject Keyword
- ISM
- Subject Keyword
- planetary nebulae
- Subject Keyword
- binaries
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Physics and Engineering
- Identifier
- http://hdl.handle.net/1959.14/91512
- Identifier
- ISSN:1432-0746
- Identifier
- mq-rm-2009004554
- Language
- eng
- Rights
- Copyright 2009 ESO. First published in Astronomy and astrophysics, Vol. 505, No. 1, 2009, published by EDP Sciences. The original publication is available at http://dx.doi.org/10.1051/0004-6361/200912176.
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