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Article: BIMA array observations of the highly unusual SiO maser source with a bipolar nebulosity IRAS 19312+1950

TitleBIMA array observations of the highly unusual SiO maser source with a bipolar nebulosity IRAS 19312+1950
Authors
KeywordsCircumstellar Matter
Ism: Jets And Outflows
Masers
Stars: Imaging
Stars: Individual (Iras 19312+1950)
Stars: Winds, Outflows
Issue Date2005
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2005, v. 633 n. 1 I, p. 282-294 How to Cite?
AbstractWe report the results of mapping observations of the bipolar nebula with SiO maser emission, IRAS 19312+ 1950, in the CO (J = 1-0 and 2-1), 13CO (J = 1-0 and 2-1), C 18O (J = 1-0), CS (J = 2-1), SO (J K = 3 2-2 1), and HCO + (J = 3-2) lines with the Berkeley-Illinois-Maryland Association array. The evolutional status of this source has been evoking a controversy since its discovery, although SiO maser sources are usually identified as late-type stars with active mass loss. In line profiles, two kinematical components are found, as reported in previous single-dish observations: a broad pedestal component and a narrow component. Spatiokinetic properties of a broad-component region traced by 12CO lines are roughly explained by a simple spherical outflow model with an expanding velocity typical of an AGB star, although some properties of the broad-component region still conflict with properties of a typical AGB spherical outflow. A narrow-component region apparently exhibits a bipolar flow. The angular size of the narrow-component region is spatially larger than that of the broad-component region. The intensity distribution of the CS emission avoids the central region of the source, and that of the SO broad-component emission exhibits a small feature peaked exactly at the mapping center. According to the present results, if the broad component really originates in a spherical outflow, an oxygen-rich evolved stellar object seems to be a natural interpretation for the central star of IRAS 19312+1950. © 2005. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/174979
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNakashima, JIen_US
dc.contributor.authorDeguchi, Sen_US
dc.date.accessioned2012-11-26T08:48:28Z-
dc.date.available2012-11-26T08:48:28Z-
dc.date.issued2005en_US
dc.identifier.citationAstrophysical Journal Letters, 2005, v. 633 n. 1 I, p. 282-294en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/174979-
dc.description.abstractWe report the results of mapping observations of the bipolar nebula with SiO maser emission, IRAS 19312+ 1950, in the CO (J = 1-0 and 2-1), 13CO (J = 1-0 and 2-1), C 18O (J = 1-0), CS (J = 2-1), SO (J K = 3 2-2 1), and HCO + (J = 3-2) lines with the Berkeley-Illinois-Maryland Association array. The evolutional status of this source has been evoking a controversy since its discovery, although SiO maser sources are usually identified as late-type stars with active mass loss. In line profiles, two kinematical components are found, as reported in previous single-dish observations: a broad pedestal component and a narrow component. Spatiokinetic properties of a broad-component region traced by 12CO lines are roughly explained by a simple spherical outflow model with an expanding velocity typical of an AGB star, although some properties of the broad-component region still conflict with properties of a typical AGB spherical outflow. A narrow-component region apparently exhibits a bipolar flow. The angular size of the narrow-component region is spatially larger than that of the broad-component region. The intensity distribution of the CS emission avoids the central region of the source, and that of the SO broad-component emission exhibits a small feature peaked exactly at the mapping center. According to the present results, if the broad component really originates in a spherical outflow, an oxygen-rich evolved stellar object seems to be a natural interpretation for the central star of IRAS 19312+1950. © 2005. 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/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectCircumstellar Matteren_US
dc.subjectIsm: Jets And Outflowsen_US
dc.subjectMasersen_US
dc.subjectStars: Imagingen_US
dc.subjectStars: Individual (Iras 19312+1950)en_US
dc.subjectStars: Winds, Outflowsen_US
dc.titleBIMA array observations of the highly unusual SiO maser source with a bipolar nebulosity IRAS 19312+1950en_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.doi10.1086/444609en_US
dc.identifier.scopuseid_2-s2.0-29244483763en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-29244483763&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume633en_US
dc.identifier.issue1 Ien_US
dc.identifier.spage282en_US
dc.identifier.epage294en_US
dc.identifier.isiWOS:000232832500027-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridNakashima, JI=35485342300en_US
dc.identifier.scopusauthoridDeguchi, S=7006314159en_US

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