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Article: Bima CO observation of EP aquarii: The semiregular pulsating star with a double-component line profile

TitleBima CO observation of EP aquarii: The semiregular pulsating star with a double-component line profile
Authors
KeywordsCircumstellar Matter
Stars: Agb And Post-Agb
Stars: Imaging
Stars: Individual (Ep Aquarii)
Stars: Late-Type
Stars: Mass Loss
Issue Date2006
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2006, v. 638 n. 2 I, p. 1041-1044 How to Cite?
AbstractThis paper reports the results of a Berkeley-Illinois-Maryland Association array interferometric observation of EP Aqr, a semiregular pulsating star with a double-component line profile in the CO J = 1-0 line. The broad component shows a flat-topped profile, and the narrow component shows a spiky strong peak. Although previous single-dish observations suggested that the CO J = 2-1 line exhibits a Gaussian-like profile, the CO J = 1-0 line does not. The spatial distributions of both the narrow and the broad components appear to be roughly round with the same peak positions. No significant velocity gradient is seen. The spatial-kinetic properties of the molecular envelope of EP Aqr are reminiscent of a multiple-shell structure model rather than of a bipolar flow and disk model. A problem with this interpretation is that no evidence of interaction between the narrow- and broad-component regions is seen. A Gaussian-like feature seen in the CO J = 2-1 line might play a key role in understanding the spatiokinetic properties of the molecular envelope of EP Aqr. © 2006. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/175003
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.date.accessioned2012-11-26T08:48:44Z-
dc.date.available2012-11-26T08:48:44Z-
dc.date.issued2006en_US
dc.identifier.citationAstrophysical Journal Letters, 2006, v. 638 n. 2 I, p. 1041-1044en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/175003-
dc.description.abstractThis paper reports the results of a Berkeley-Illinois-Maryland Association array interferometric observation of EP Aqr, a semiregular pulsating star with a double-component line profile in the CO J = 1-0 line. The broad component shows a flat-topped profile, and the narrow component shows a spiky strong peak. Although previous single-dish observations suggested that the CO J = 2-1 line exhibits a Gaussian-like profile, the CO J = 1-0 line does not. The spatial distributions of both the narrow and the broad components appear to be roughly round with the same peak positions. No significant velocity gradient is seen. The spatial-kinetic properties of the molecular envelope of EP Aqr are reminiscent of a multiple-shell structure model rather than of a bipolar flow and disk model. A problem with this interpretation is that no evidence of interaction between the narrow- and broad-component regions is seen. A Gaussian-like feature seen in the CO J = 2-1 line might play a key role in understanding the spatiokinetic properties of the molecular envelope of EP Aqr. © 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/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectCircumstellar Matteren_US
dc.subjectStars: Agb And Post-Agben_US
dc.subjectStars: Imagingen_US
dc.subjectStars: Individual (Ep Aquarii)en_US
dc.subjectStars: Late-Typeen_US
dc.subjectStars: Mass Lossen_US
dc.titleBima CO observation of EP aquarii: The semiregular pulsating star with a double-component line profileen_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.doi10.1086/498934en_US
dc.identifier.scopuseid_2-s2.0-33644813397en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33644813397&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume638en_US
dc.identifier.issue2 Ien_US
dc.identifier.spage1041en_US
dc.identifier.epage1044en_US
dc.identifier.isiWOS:000235425700042-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridNakashima, JI=35485342300en_US

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