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Article: Japanese VLBI network mapping of sio v = 3 J = 1-0 maser emission in W hydrae

TitleJapanese VLBI network mapping of sio v = 3 J = 1-0 maser emission in W hydrae
Authors
KeywordsMasers
Stars: Agb And Post-Agb
Stars: Individual (W Hydrae)
Issue Date2010
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, 2010, v. 62 n. 2, p. 431-439 How to Cite?
AbstractWe report first on two-epoch mapping observations of SiO v = 3 J = 1-0 maser emission in the semiregular variable W Hydrae using the Japanese VLBI Network. The flux density of the v = 3 J = 1-0 emission detected on 2009 February 28 was two orders of magnitude smaller than those of the v = 1 and v = 2 emissions, while a month and half later the v = 3 flux density suddenly increased by a factor of ̃25. In contrast, the v = 1 and v = 2 flux densities decreased during this period, as expected from the optical light curve. At the first epoch, the v = 3 maser features were located inside of a ring composed of the v = 1 and v = 2 features by 6 mas (≳0.5 AU) toward the central star. These offsets are meaningfully larger than the error of the fitted ring radius and the difference in the ring sizes of v = 1 and v = 2 masers (≲ 0.2 AU). The present result at the first epoch suggests that v = 3 J = 1-0 SiO masers are predominantly excited in a pumping mechanism (e.g., collisional pumping) different from that recently proposed on the basis of the line overlap with infrared H2O lines. Interestingly, the second-epoch observation revealed that the v = 3 features were located on almost the same ring as the v = 2 ring, which is consistent with what line-overlap theory suggests. © 2010. Astronomical Society of Japan.
Persistent Identifierhttp://hdl.handle.net/10722/175175
ISSN
2015 Impact Factor: 1.961
2015 SCImago Journal Rankings: 0.804
References

 

DC FieldValueLanguage
dc.contributor.authorIma, Hen_US
dc.contributor.authorNakashima, JIen_US
dc.contributor.authorDeguchi, Sen_US
dc.contributor.authorYamauchi, Aen_US
dc.contributor.authorNakagawa, Aen_US
dc.contributor.authorNagayama, Ten_US
dc.date.accessioned2012-11-26T08:49:37Z-
dc.date.available2012-11-26T08:49:37Z-
dc.date.issued2010en_US
dc.identifier.citationPublications Of The Astronomical Society Of Japan, 2010, v. 62 n. 2, p. 431-439en_US
dc.identifier.issn0004-6264en_US
dc.identifier.urihttp://hdl.handle.net/10722/175175-
dc.description.abstractWe report first on two-epoch mapping observations of SiO v = 3 J = 1-0 maser emission in the semiregular variable W Hydrae using the Japanese VLBI Network. The flux density of the v = 3 J = 1-0 emission detected on 2009 February 28 was two orders of magnitude smaller than those of the v = 1 and v = 2 emissions, while a month and half later the v = 3 flux density suddenly increased by a factor of ̃25. In contrast, the v = 1 and v = 2 flux densities decreased during this period, as expected from the optical light curve. At the first epoch, the v = 3 maser features were located inside of a ring composed of the v = 1 and v = 2 features by 6 mas (≳0.5 AU) toward the central star. These offsets are meaningfully larger than the error of the fitted ring radius and the difference in the ring sizes of v = 1 and v = 2 masers (≲ 0.2 AU). The present result at the first epoch suggests that v = 3 J = 1-0 SiO masers are predominantly excited in a pumping mechanism (e.g., collisional pumping) different from that recently proposed on the basis of the line overlap with infrared H2O lines. Interestingly, the second-epoch observation revealed that the v = 3 features were located on almost the same ring as the v = 2 ring, which is consistent with what line-overlap theory suggests. © 2010. Astronomical Society of Japan.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.subjectMasersen_US
dc.subjectStars: Agb And Post-Agben_US
dc.subjectStars: Individual (W Hydrae)en_US
dc.titleJapanese VLBI network mapping of sio v = 3 J = 1-0 maser emission in W hydraeen_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.doi10.1093/pasj/62.2.431-
dc.identifier.scopuseid_2-s2.0-77953336109en_US
dc.identifier.hkuros170725-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77953336109&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume62en_US
dc.identifier.issue2en_US
dc.identifier.spage431en_US
dc.identifier.epage439en_US
dc.publisher.placeJapanen_US
dc.identifier.scopusauthoridIma, H=36107053400en_US
dc.identifier.scopusauthoridNakashima, JI=35485342300en_US
dc.identifier.scopusauthoridDeguchi, S=7006314159en_US
dc.identifier.scopusauthoridYamauchi, A=7202129882en_US
dc.identifier.scopusauthoridNakagawa, A=7202934558en_US
dc.identifier.scopusauthoridNagayama, T=16068994700en_US

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