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Article: Study of the Bipolar Nebula IRAS 19312 + 1950. I. Mapping Observations

TitleStudy of the Bipolar Nebula IRAS 19312 + 1950. I. Mapping Observations
Authors
KeywordsStars: Agb And Post-Agb
Stars: Circumstellar Matter
Stars: Individual (Iras 19312 + 1950)
Issue Date2004
PublisherNihon Tenmon Gakkai. The Journal's web site is located at http://www.asj.or.jp/pasj/
Citation
Publications Of The Astronomical Society Of Japan, 2004, v. 56 n. 1, p. 193-205 How to Cite?
AbstractIRAS 19312 + 1950 is an SiO maser source that exhibits a prominent bipolar nebulosity. Mapping observations of this object were made in the CO J = 1-0, 13CO J = 1-0, C 18 O J = 1-0, CS J = 2-1, and HCN J = 1-0 lines and in the 150 GHz continuum band. Near-infrared imaging observations were also made in the J, H, and K-bands. The line profiles of the 12CO and HCN spectra consist of a weak component with the width of 50km s -1 and a strong component of the width of 3 km s -1. The profiles of the 13CO, C 18 O, and CS lines have only the narrow component. Both of the components have an intensity peak at the IRAS position. The narrow component was clearly resolved with a 15″ telescope beam. The spectral energy distribution of this object exhibits a doubly peaked profile between 1 and 25 μm. The 150 GHz continuum flux density was found to be 0.07 Jy, which is consistent with the flux density predicted by the expanding envelope model with a mass loss rate of ∼ 10 -4 M⊙ yr -1 at a distance of 2.5kpc. We argue that the broad component originates from the expanding envelope of this object, and that the hot dust cloud, the source of the narrow component, is physically associated with this object. Though the present observations do not preclude the possibility of a young stellar object, we argue that it is less plausible. We conclude that IRAS 19312 + 1950 is an AGB/post-AGB star that evolved from a massive progenitor.
Persistent Identifierhttp://hdl.handle.net/10722/174944
ISSN
2015 Impact Factor: 1.961
2015 SCImago Journal Rankings: 0.804
References

 

DC FieldValueLanguage
dc.contributor.authorNakashima, JIen_US
dc.contributor.authorDeguchi, Sen_US
dc.contributor.authorKuno, Nen_US
dc.date.accessioned2012-11-26T08:48:17Z-
dc.date.available2012-11-26T08:48:17Z-
dc.date.issued2004en_US
dc.identifier.citationPublications Of The Astronomical Society Of Japan, 2004, v. 56 n. 1, p. 193-205en_US
dc.identifier.issn0004-6264en_US
dc.identifier.urihttp://hdl.handle.net/10722/174944-
dc.description.abstractIRAS 19312 + 1950 is an SiO maser source that exhibits a prominent bipolar nebulosity. Mapping observations of this object were made in the CO J = 1-0, 13CO J = 1-0, C 18 O J = 1-0, CS J = 2-1, and HCN J = 1-0 lines and in the 150 GHz continuum band. Near-infrared imaging observations were also made in the J, H, and K-bands. The line profiles of the 12CO and HCN spectra consist of a weak component with the width of 50km s -1 and a strong component of the width of 3 km s -1. The profiles of the 13CO, C 18 O, and CS lines have only the narrow component. Both of the components have an intensity peak at the IRAS position. The narrow component was clearly resolved with a 15″ telescope beam. The spectral energy distribution of this object exhibits a doubly peaked profile between 1 and 25 μm. The 150 GHz continuum flux density was found to be 0.07 Jy, which is consistent with the flux density predicted by the expanding envelope model with a mass loss rate of ∼ 10 -4 M⊙ yr -1 at a distance of 2.5kpc. We argue that the broad component originates from the expanding envelope of this object, and that the hot dust cloud, the source of the narrow component, is physically associated with this object. Though the present observations do not preclude the possibility of a young stellar object, we argue that it is less plausible. We conclude that IRAS 19312 + 1950 is an AGB/post-AGB star that evolved from a massive progenitor.en_US
dc.languageengen_US
dc.publisherNihon Tenmon Gakkai. The Journal's web site is located at http://www.asj.or.jp/pasj/en_US
dc.relation.ispartofPublications of the Astronomical Society of Japanen_US
dc.subjectStars: Agb And Post-Agben_US
dc.subjectStars: Circumstellar Matteren_US
dc.subjectStars: Individual (Iras 19312 + 1950)en_US
dc.titleStudy of the Bipolar Nebula IRAS 19312 + 1950. I. Mapping Observationsen_US
dc.typeArticleen_US
dc.identifier.emailNakashima, JI: junichi@hku.hken_US
dc.identifier.authorityNakashima, JI=rp00764en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-1942443872en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1942443872&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume56en_US
dc.identifier.issue1en_US
dc.identifier.spage193en_US
dc.identifier.epage205en_US
dc.publisher.placeJapanen_US
dc.identifier.scopusauthoridNakashima, JI=35485342300en_US
dc.identifier.scopusauthoridDeguchi, S=7006314159en_US
dc.identifier.scopusauthoridKuno, N=7005279621en_US

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