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Article: A slowly expanding disk and fast bipolar outflow from the S star π1 gruis

TitleA slowly expanding disk and fast bipolar outflow from the S star π1 gruis
Authors
KeywordsCircumstellar Matter
Stars: Agb And Post-Agb
Stars: Individual (Π Gruis)
Issue Date2006
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X
Citation
The Astrophysical Journal, 2006, v. 645 n. 1, p. 605-612 How to Cite?
AbstractWe study the molecular outflow of the nearby evolved S star π1 Gru. We imaged the outflow in CO J = 2-1 and dust continuum with the Submillimeter Array. The CO emission was detected over a very broad velocity width of ∼90 km s-1. Our high-resolution images show that the outflow at low velocities (≤15 km s-1) is elongated east-west and at high velocities (≥25 km s-1) is displaced north (at redshifted velocities) and south (blueshifted velocities) of center as defined by the dust continuum source. We model the spatial-kinematic structure of the low-velocity outflow as a flared disk with a central cavity of radius 200 AU and an expansion velocity of 11 km s-1, inclined by 55° to our line of sight. We attribute the high-velocity component to a bipolar outflow that emerges perpendicular to this disk with a velocity of up to ∼45 km s-1. This high-velocity outflow may play an important role in shaping the gas envelope previously ejected by the AGB star and thus produce a bipolar morphology when the object evolves into a proto-planetary nebula. © 2006. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/179698
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChiu, PJen_US
dc.contributor.authorHoang, CTen_US
dc.contributor.authorDinhVTrungen_US
dc.contributor.authorLim, Jen_US
dc.contributor.authorKwok, Sen_US
dc.contributor.authorHirano, Nen_US
dc.contributor.authorMuthu, Cen_US
dc.date.accessioned2012-12-19T10:02:54Z-
dc.date.available2012-12-19T10:02:54Z-
dc.date.issued2006en_US
dc.identifier.citationThe Astrophysical Journal, 2006, v. 645 n. 1, p. 605-612en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/179698-
dc.description.abstractWe study the molecular outflow of the nearby evolved S star π1 Gru. We imaged the outflow in CO J = 2-1 and dust continuum with the Submillimeter Array. The CO emission was detected over a very broad velocity width of ∼90 km s-1. Our high-resolution images show that the outflow at low velocities (≤15 km s-1) is elongated east-west and at high velocities (≥25 km s-1) is displaced north (at redshifted velocities) and south (blueshifted velocities) of center as defined by the dust continuum source. We model the spatial-kinematic structure of the low-velocity outflow as a flared disk with a central cavity of radius 200 AU and an expansion velocity of 11 km s-1, inclined by 55° to our line of sight. We attribute the high-velocity component to a bipolar outflow that emerges perpendicular to this disk with a velocity of up to ∼45 km s-1. This high-velocity outflow may play an important role in shaping the gas envelope previously ejected by the AGB star and thus produce a bipolar morphology when the object evolves into a proto-planetary nebula. © 2006. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637Xen_US
dc.relation.ispartofThe Astrophysical Journalen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectCircumstellar Matteren_US
dc.subjectStars: Agb And Post-Agben_US
dc.subjectStars: Individual (Π Gruis)en_US
dc.titleA slowly expanding disk and fast bipolar outflow from the S star π1 gruisen_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.emailKwok, S: deannote@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.identifier.authorityKwok, S=rp00716en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1086/504309en_US
dc.identifier.scopuseid_2-s2.0-33747018264en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33747018264&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume645en_US
dc.identifier.issue1en_US
dc.identifier.spage605en_US
dc.identifier.epage612en_US
dc.identifier.isiWOS:000238832900050-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridChiu, PJ=45260951200en_US
dc.identifier.scopusauthoridHoang, CT=45261154900en_US
dc.identifier.scopusauthoridDinhVTrung=15520778600en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US
dc.identifier.scopusauthoridHirano, N=35769189500en_US
dc.identifier.scopusauthoridMuthu, C=6602324244en_US

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