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Article: BIMA array observations of the highly unusual SiO maser source with a bipolar nebulosity IRAS 19312+1950
Title | BIMA array observations of the highly unusual SiO maser source with a bipolar nebulosity IRAS 19312+1950 |
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Authors | |
Keywords | Circumstellar Matter Ism: Jets And Outflows Masers Stars: Imaging Stars: Individual (Iras 19312+1950) Stars: Winds, Outflows |
Issue Date | 2005 |
Publisher | Institute 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? |
Abstract | We 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 Identifier | http://hdl.handle.net/10722/174979 |
ISSN | 2023 Impact Factor: 8.8 2023 SCImago Journal Rankings: 2.766 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Nakashima, JI | en_US |
dc.contributor.author | Deguchi, S | en_US |
dc.date.accessioned | 2012-11-26T08:48:28Z | - |
dc.date.available | 2012-11-26T08:48:28Z | - |
dc.date.issued | 2005 | en_US |
dc.identifier.citation | Astrophysical Journal Letters, 2005, v. 633 n. 1 I, p. 282-294 | en_US |
dc.identifier.issn | 2041-8205 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/174979 | - |
dc.description.abstract | We 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.language | eng | en_US |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205 | en_US |
dc.relation.ispartof | Astrophysical Journal Letters | en_US |
dc.subject | Circumstellar Matter | en_US |
dc.subject | Ism: Jets And Outflows | en_US |
dc.subject | Masers | en_US |
dc.subject | Stars: Imaging | en_US |
dc.subject | Stars: Individual (Iras 19312+1950) | en_US |
dc.subject | Stars: Winds, Outflows | en_US |
dc.title | BIMA array observations of the highly unusual SiO maser source with a bipolar nebulosity IRAS 19312+1950 | en_US |
dc.type | Article | en_US |
dc.identifier.email | Nakashima, JI: junichi@hku.hk | en_US |
dc.identifier.authority | Nakashima, JI=rp00764 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1086/444609 | en_US |
dc.identifier.scopus | eid_2-s2.0-29244483763 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-29244483763&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 633 | en_US |
dc.identifier.issue | 1 I | en_US |
dc.identifier.spage | 282 | en_US |
dc.identifier.epage | 294 | en_US |
dc.identifier.isi | WOS:000232832500027 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Nakashima, JI=35485342300 | en_US |
dc.identifier.scopusauthorid | Deguchi, S=7006314159 | en_US |
dc.identifier.issnl | 2041-8205 | - |