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Article: A morphological study of planetary nebulae

TitleA morphological study of planetary nebulae
Authors
KeywordsIsm: Structure
Planetary Nebulae: General
Issue Date1998
Citation
Astrophysical Journal, Supplement Series, 1998, v. 117 n. 2, p. 341-359 How to Cite?
AbstractWe have produced simulated images of 110 planetary nebulae using the ellipsoidal shell model. This process has allowed us to remove the projection effects from the morphological classification of planetary nebulae and has provided quantitative measures of the intrinsic asymmetries of the nebulae. It is shown that the morphology of most planetary nebulae can be reproduced with pole-to-equator density ratios of 0.1-1. Many planetary nebulae also show a modest departure from axial symmetry. Contrary to previous findings by Khromov & Kohoutek, the sky orientation of planetary nebulae in this sample is consistent with a purely random distribution. Extremely bipolar nebulae (e.g., those of butterfly shape) point to a steep density profile in the AGB envelope and are more likely to be type I (high helium and/or nitrogen abundance) nebulae. We found evidence that these nebulae are likely to have more massive progenitors and are at a more advanced stage of dynamical evolution.
Persistent Identifierhttp://hdl.handle.net/10722/179672
ISSN
2015 Impact Factor: 11.257
2015 SCImago Journal Rankings: 6.522
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, CYen_US
dc.contributor.authorKwok, Sen_US
dc.date.accessioned2012-12-19T10:02:44Z-
dc.date.available2012-12-19T10:02:44Z-
dc.date.issued1998en_US
dc.identifier.citationAstrophysical Journal, Supplement Series, 1998, v. 117 n. 2, p. 341-359en_US
dc.identifier.issn0067-0049en_US
dc.identifier.urihttp://hdl.handle.net/10722/179672-
dc.description.abstractWe have produced simulated images of 110 planetary nebulae using the ellipsoidal shell model. This process has allowed us to remove the projection effects from the morphological classification of planetary nebulae and has provided quantitative measures of the intrinsic asymmetries of the nebulae. It is shown that the morphology of most planetary nebulae can be reproduced with pole-to-equator density ratios of 0.1-1. Many planetary nebulae also show a modest departure from axial symmetry. Contrary to previous findings by Khromov & Kohoutek, the sky orientation of planetary nebulae in this sample is consistent with a purely random distribution. Extremely bipolar nebulae (e.g., those of butterfly shape) point to a steep density profile in the AGB envelope and are more likely to be type I (high helium and/or nitrogen abundance) nebulae. We found evidence that these nebulae are likely to have more massive progenitors and are at a more advanced stage of dynamical evolution.en_US
dc.languageengen_US
dc.relation.ispartofAstrophysical Journal, Supplement Seriesen_US
dc.subjectIsm: Structureen_US
dc.subjectPlanetary Nebulae: Generalen_US
dc.titleA morphological study of planetary nebulaeen_US
dc.typeArticleen_US
dc.identifier.emailKwok, S: deannote@hku.hken_US
dc.identifier.authorityKwok, S=rp00716en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1086/313118en_US
dc.identifier.scopuseid_2-s2.0-0043281137en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0043281137&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume117en_US
dc.identifier.issue2en_US
dc.identifier.spage341en_US
dc.identifier.epage359en_US
dc.identifier.isiWOS:000075449200002-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridZhang, CY=38260889100en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US

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