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Article: The shaping effect of collimated fast outflows in the egg nebula

TitleThe shaping effect of collimated fast outflows in the egg nebula
Authors
KeywordsCircumstellar Matter
Ism: Molecules
Planetary Nebulae: General
Stars: Agb And Post-Agb
Stars: Individual (Crl 2688)
Stars: Mass Loss
Issue Date2009
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2009, v. 698 n. 1, p. 439-444 How to Cite?
AbstractWe present high angular resolution observations of the HC 3N J = 5-4 line from the Egg nebula, which is the archetype of proto-planetary nebulae (PPNs). We find that the HC 3N emission in the approaching and receding portion of the envelope traces a clumpy hollow shell, similar to that seen in normal carbon-rich envelopes. Near the systemic velocity, the hollow shell is fragmented into several large blobs or arcs with missing portions correspond spatially to locations of previously reported high-velocity outflows in the Egg nebula. This provides direct evidence for the disruption of the slowly expanding envelope ejected during the AGB phase by the collimated fast outflows initiated during the transition to the PPN phase. From modeling the HC 3N distribution, we could reproduce qualitatively the spatial kinematics of the HC 3N J = 5-4 emission using a HC 3N shell with two pairs of cavities cleared by the collimated high-velocity outflows along the polar direction and in the equatorial plane. We infer a relatively high abundance of HC 3N/H 2 3 × 10 -6 for an estimated mass-loss rate of 3 × 10 -5 M⊙ yr -1 in the HC 3N shell. The high abundance of HC 3N and the presence of some weaker J = 5-4 emission in the vicinity of the central post-AGB star suggest an unusually efficient formation of this molecule in the Egg nebula. © 2009. The American Astronomical Society.
Persistent Identifierhttp://hdl.handle.net/10722/175160
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTrung, DVen_US
dc.contributor.authorLim, Jen_US
dc.date.accessioned2012-11-26T08:49:29Z-
dc.date.available2012-11-26T08:49:29Z-
dc.date.issued2009en_US
dc.identifier.citationAstrophysical Journal Letters, 2009, v. 698 n. 1, p. 439-444en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/175160-
dc.description.abstractWe present high angular resolution observations of the HC 3N J = 5-4 line from the Egg nebula, which is the archetype of proto-planetary nebulae (PPNs). We find that the HC 3N emission in the approaching and receding portion of the envelope traces a clumpy hollow shell, similar to that seen in normal carbon-rich envelopes. Near the systemic velocity, the hollow shell is fragmented into several large blobs or arcs with missing portions correspond spatially to locations of previously reported high-velocity outflows in the Egg nebula. This provides direct evidence for the disruption of the slowly expanding envelope ejected during the AGB phase by the collimated fast outflows initiated during the transition to the PPN phase. From modeling the HC 3N distribution, we could reproduce qualitatively the spatial kinematics of the HC 3N J = 5-4 emission using a HC 3N shell with two pairs of cavities cleared by the collimated high-velocity outflows along the polar direction and in the equatorial plane. We infer a relatively high abundance of HC 3N/H 2 3 × 10 -6 for an estimated mass-loss rate of 3 × 10 -5 M⊙ yr -1 in the HC 3N shell. The high abundance of HC 3N and the presence of some weaker J = 5-4 emission in the vicinity of the central post-AGB star suggest an unusually efficient formation of this molecule in the Egg nebula. © 2009. The American Astronomical Society.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectCircumstellar Matteren_US
dc.subjectIsm: Moleculesen_US
dc.subjectPlanetary Nebulae: Generalen_US
dc.subjectStars: Agb And Post-Agben_US
dc.subjectStars: Individual (Crl 2688)en_US
dc.subjectStars: Mass Lossen_US
dc.titleThe shaping effect of collimated fast outflows in the egg nebulaen_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1088/0004-637X/698/1/439en_US
dc.identifier.scopuseid_2-s2.0-66649109448en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-66649109448&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume698en_US
dc.identifier.issue1en_US
dc.identifier.spage439en_US
dc.identifier.epage444en_US
dc.identifier.isiWOS:000266373700033-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridTrung, DV=6701469660en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US

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