R Aquarii: First Detection of Circumstellar SiO Maser Proper Motions

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dc.contributorVirginia Techen
dc.contributor.authorBoboltz, David Allen Jr.en
dc.contributor.authorDiamond, Philip J.en
dc.contributor.authorKemball, A. J.en
dc.contributor.departmentPhysicsen
dc.date.accessed2014-02-28en
dc.date.accessioned2014-03-10T13:18:52Zen
dc.date.available2014-03-10T13:18:52Zen
dc.date.issued1997-10en
dc.description.abstractWe have made the first detection of circumstellar SiO maser proper motions in the envelope of a late-type star. Using the Very Long Baseline Array (VLBA), we have obtained observations at four epochs of the 43 GHz, upsilon = 1, J = 1-0 SiO maser emission toward the Mira variable in the symbiotic binary R Aqr. The maser emission has a ringlike structure approximately 31 mas across with a slight elongation in the north-south direction. We find that the emission changes significantly over a timescale of about 1-2 months with almost no similarity in structure for timescales greater than or similar to 6 months. Our observations show that over a 98 day period the masers have an average inward proper motion of about 1 mas. This contraction of the ring implies an infall velocity of about 4 km s(-1) for the SiO masers in the circumstellar envelope.en
dc.identifier.citationD. A. Boboltz et al. 1997 ApJ 487 L147 doi:10.1086/310896en
dc.identifier.doihttps://doi.org/10.1086/310896en
dc.identifier.issn0004-637Xen
dc.identifier.urihttp://hdl.handle.net/10919/25857en
dc.identifier.urlhttp://iopscience.iop.org/1538-4357/487/2/L147en
dc.language.isoen_USen
dc.publisherIOP PUBLISHING LTDen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectbinaries, symbioticen
dc.subjectcircumstellar matteren
dc.subjectmasersen
dc.subjectstars, individual (r aquarii)en
dc.subjectstarsen
dc.subjectemissionen
dc.subjectw3(oh)en
dc.subjectradioen
dc.subjectjeten
dc.titleR Aquarii: First Detection of Circumstellar SiO Maser Proper Motionsen
dc.title.serialAstrophysical Journalen
dc.typeArticle - Refereeden

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