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Article: High-resolution imaging of proto-planetary nebulae: The effects of orientation

TitleHigh-resolution imaging of proto-planetary nebulae: The effects of orientation
Authors
KeywordsCircumstellar Matter
Planetary Nebulae: General
Stars: Agb And Post-Agb
Stars: Mass Loss
Issue Date2001
PublisherUniversity of Chicago Press. The Journal's web site is located at http://www.journals.uchicago.edu/AJ/home.html
Citation
Astronomical Journal, 2001, v. 122 n. 3, p. 1525-1537 How to Cite?
AbstractDeep Hubble Space Telescope (HST) F814W images were obtained of six proto-planetary nebulae (PPNs), each of which shows a bipolar morphology but with a difference in orientation. Two of these (IRAS 17245-3951 and IRAS 22574+6609) show a dark lane separating bipolar lobes and appear to be seen approximately edge-on. The other four (IRAS 16594-4656, 17106-3046, 19477+2401, and 20028+3910) appear to be at intermediate orientations, and in all but one case, the central star is seen. In addition, one bright PPN (IRAS 20136+1309) was observed that is slightly extended, and we suggest that it may be a bipolar nebula seen edge-on. Visible-band HST images also exist for six of these, and color images were formed to analyze the dust distribution. New ground-based photometry was combined with satellite data to delineate the spectral energy distribution (SED) from 0.5 to 100 μm for each of these. The orientation effects on the optical morphologies and the SEDs are discussed. In general, the ratio of dust to photospheric flux is higher as the orientation increases toward edge-on, although there are some exceptions. Some numerical models were constructed and used to show quantitatively the effects that differences in the asymmetry of the circumstellar envelope or in the size of the cavity opening angle can have on this ratio. The general differences in appearance and SED of these PPNs are attributed primarily to the different viewing orientations. These results, when combined with those of previous imaging studies of PPNs, strengthen the idea that PPNs possess a basic bipolar structure due to an asymmetric circumstellar dust shell.
Persistent Identifierhttp://hdl.handle.net/10722/179637
ISSN
2015 Impact Factor: 4.617
2015 SCImago Journal Rankings: 3.069
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSu, KYLen_US
dc.contributor.authorHrivnak, BJen_US
dc.contributor.authorKwok, Sen_US
dc.date.accessioned2012-12-19T10:02:12Z-
dc.date.available2012-12-19T10:02:12Z-
dc.date.issued2001en_US
dc.identifier.citationAstronomical Journal, 2001, v. 122 n. 3, p. 1525-1537en_US
dc.identifier.issn0004-6256en_US
dc.identifier.urihttp://hdl.handle.net/10722/179637-
dc.description.abstractDeep Hubble Space Telescope (HST) F814W images were obtained of six proto-planetary nebulae (PPNs), each of which shows a bipolar morphology but with a difference in orientation. Two of these (IRAS 17245-3951 and IRAS 22574+6609) show a dark lane separating bipolar lobes and appear to be seen approximately edge-on. The other four (IRAS 16594-4656, 17106-3046, 19477+2401, and 20028+3910) appear to be at intermediate orientations, and in all but one case, the central star is seen. In addition, one bright PPN (IRAS 20136+1309) was observed that is slightly extended, and we suggest that it may be a bipolar nebula seen edge-on. Visible-band HST images also exist for six of these, and color images were formed to analyze the dust distribution. New ground-based photometry was combined with satellite data to delineate the spectral energy distribution (SED) from 0.5 to 100 μm for each of these. The orientation effects on the optical morphologies and the SEDs are discussed. In general, the ratio of dust to photospheric flux is higher as the orientation increases toward edge-on, although there are some exceptions. Some numerical models were constructed and used to show quantitatively the effects that differences in the asymmetry of the circumstellar envelope or in the size of the cavity opening angle can have on this ratio. The general differences in appearance and SED of these PPNs are attributed primarily to the different viewing orientations. These results, when combined with those of previous imaging studies of PPNs, strengthen the idea that PPNs possess a basic bipolar structure due to an asymmetric circumstellar dust shell.en_US
dc.languageengen_US
dc.publisherUniversity of Chicago Press. The Journal's web site is located at http://www.journals.uchicago.edu/AJ/home.htmlen_US
dc.relation.ispartofAstronomical Journalen_US
dc.subjectCircumstellar Matteren_US
dc.subjectPlanetary Nebulae: Generalen_US
dc.subjectStars: Agb And Post-Agben_US
dc.subjectStars: Mass Lossen_US
dc.titleHigh-resolution imaging of proto-planetary nebulae: The effects of orientationen_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.doi10.1086/322098en_US
dc.identifier.scopuseid_2-s2.0-0001218218en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0001218218&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume122en_US
dc.identifier.issue3en_US
dc.identifier.spage1525en_US
dc.identifier.epage1537en_US
dc.identifier.isiWOS:000170997700032-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridSu, KYL=26326482200en_US
dc.identifier.scopusauthoridHrivnak, BJ=35613962100en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US

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