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Rotation of the asymptotic giant branch star R Doradus

hal.structure.identifierOnsala Space Observatory, Dept. of Radio and Space Science, Chalmers University of Technology
dc.contributor.authorVLEMMINGS, W. H. T.
dc.contributor.authorKHOURI, T.
dc.contributor.authorDE BECK, E.
hal.structure.identifierOnsala Space Observatory [OSO]
dc.contributor.authorOLOFSSON, H.
dc.contributor.authorGARCIA-SEGURA, G.
dc.contributor.authorVILLAVER, E.
hal.structure.identifierFORMATION STELLAIRE 2018
dc.contributor.authorBAUDRY, Alain
hal.structure.identifierEuropean Southern Observatory [ESO]
dc.contributor.authorHUMPHREYS, E. M. L.
dc.contributor.authorMAERCKER, M.
dc.contributor.authorRAMSTEDT, S.
dc.date.issued2018
dc.identifier.issn0004-6361
dc.description.abstractEnHigh resolution observations of the extended atmospheres of asymptotic giant branch (AGB) stars can now directly confront the theories that describe stellar mass loss. Using Atacama Large Millimeter/submillimeter Array (ALMA) high angular resolution ($30\times42$~mas) observations we have, for the first time, resolved stellar rotation of an AGB star, R~Dor. We measure an angular rotation velocity of $\omega_R\sin{i}=(3.5\pm0.3)\times10^{-9}$~rad~s$^{-1}$ which indicates a rotational velocity of $|\upsilon_{\rm rot}\sin{i}|=1.0\pm0.1$~km~s$^{-1}$ at the stellar surface ($R_*=31.2$~mas at $214$~GHz). The rotation axis projected on the plane of the sky has a position angle $\Phi=7\pm6^\circ$. We find that the rotation of R Dor is two orders of magnitude faster than expected for a solitary AGB star that will have lost most of its angular momentum. Its rotational velocity is consistent with angular momentum transfer from a close companion. As a companion has not been directly detected we thus suggest R~Dor has a low-mass, close-in, companion. The rotational velocity approaches the critical velocity, set by the local sound speed in the extended envelope, and is thus expected to affect the mass loss characteristics of R~Dor.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enRotation of the asymptotic giant branch star R Doradus
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201832929
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1804.04709
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.L4
bordeaux.issue613
bordeaux.peerReviewedoui
hal.identifierhal-01767493
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01767493v1
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