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Article: Study of the bipolar nebula IRAS 19312 + 1950. II. Circumstellar chemistry

TitleStudy of the bipolar nebula IRAS 19312 + 1950. II. Circumstellar chemistry
Authors
KeywordsStars: Circumstellar Matter
Stars: Individual (Iras 19312+1950)
Stars: Late-Type
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. 6, p. 1083-1098 How to Cite?
AbstractThe bipolar nebula IRAS 19312+1950 is a unique SiO maser source exhibiting both properties of young and evolved objects. To clarify the nature of this object, we made molecular line observations with the Nobeyama 45-m radio telescope. We detected emission from O-bearing (HCO +, SiO, SO, and SO 2), C- and N-bearing molecules (CN, CS, HCN, HNC, NH 3, N 2H +, HC 3N, H 2CS, and CH 3OH), and their isotopic species (C 17O, 13C 18O, and C 34S). The line profiles consist of weak broad (Δu ∼ 30kms -1) and/or strong narrow (Δu ∼ 30kms -1) components, depending on the molecular species. Strong time variations of H 2O and SiO masers were also observed. Numerical modeling of the envelope with the LVG-code resulted in a good fit of the model with a mass loss rate of 2.6 × 10 -4 M⊙yr -1 to the observed intensities for the broad-component lines. On the other hand, non-O-bearing molecules, which only have narrow profiles, were found to have abundances typical of those in cool dust clouds. No isotopic enrichment was found, indicating little evidence of the narrow cool component being ejecta of the central AGB star or a possible companion. These facts compelled us to conclude that IRAS 19312+ 1950 is an exotic mass-losing evolved star embedded in a low-mass (∼ 20 M⊙) dark cloud.
Persistent Identifierhttp://hdl.handle.net/10722/174924
ISSN
2015 Impact Factor: 1.961
2015 SCImago Journal Rankings: 0.804
References

 

DC FieldValueLanguage
dc.contributor.authorDeguchi, Sen_US
dc.contributor.authorNakashima, JIen_US
dc.contributor.authorTakano, Sen_US
dc.date.accessioned2012-11-26T08:48:09Z-
dc.date.available2012-11-26T08:48:09Z-
dc.date.issued2004en_US
dc.identifier.citationPublications Of The Astronomical Society Of Japan, 2004, v. 56 n. 6, p. 1083-1098en_US
dc.identifier.issn0004-6264en_US
dc.identifier.urihttp://hdl.handle.net/10722/174924-
dc.description.abstractThe bipolar nebula IRAS 19312+1950 is a unique SiO maser source exhibiting both properties of young and evolved objects. To clarify the nature of this object, we made molecular line observations with the Nobeyama 45-m radio telescope. We detected emission from O-bearing (HCO +, SiO, SO, and SO 2), C- and N-bearing molecules (CN, CS, HCN, HNC, NH 3, N 2H +, HC 3N, H 2CS, and CH 3OH), and their isotopic species (C 17O, 13C 18O, and C 34S). The line profiles consist of weak broad (Δu ∼ 30kms -1) and/or strong narrow (Δu ∼ 30kms -1) components, depending on the molecular species. Strong time variations of H 2O and SiO masers were also observed. Numerical modeling of the envelope with the LVG-code resulted in a good fit of the model with a mass loss rate of 2.6 × 10 -4 M⊙yr -1 to the observed intensities for the broad-component lines. On the other hand, non-O-bearing molecules, which only have narrow profiles, were found to have abundances typical of those in cool dust clouds. No isotopic enrichment was found, indicating little evidence of the narrow cool component being ejecta of the central AGB star or a possible companion. These facts compelled us to conclude that IRAS 19312+ 1950 is an exotic mass-losing evolved star embedded in a low-mass (∼ 20 M⊙) dark cloud.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: Circumstellar Matteren_US
dc.subjectStars: Individual (Iras 19312+1950)en_US
dc.subjectStars: Late-Typeen_US
dc.titleStudy of the bipolar nebula IRAS 19312 + 1950. II. Circumstellar chemistryen_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-s2.0-12344281826en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-12344281826&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume56en_US
dc.identifier.issue6en_US
dc.identifier.spage1083en_US
dc.identifier.epage1098en_US
dc.publisher.placeJapanen_US
dc.identifier.scopusauthoridDeguchi, S=7006314159en_US
dc.identifier.scopusauthoridNakashima, JI=35485342300en_US
dc.identifier.scopusauthoridTakano, S=7201430474en_US

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