A large rotating structure around AB Doradus A at VLBI scale
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Published:2019-06
Issue:S354
Volume:15
Page:189-194
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ISSN:1743-9213
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Container-title:Proceedings of the International Astronomical Union
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language:en
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Short-container-title:Proc. IAU
Author:
Climent J. B.ORCID,
Guirado J. C.,
Azulay R.,
Marcaide J. M.
Abstract
AbstractWe report the results of three VLBI observations of the pre-main-sequence star AB Doradus A at 8.4 GHz. With almost three years between consecutive observations, we found a complex structure at the expected position of this star for all epochs. Maps at epochs 2007 and 2010 show a double core-halo morphology while the 2013 map reveals three emission peaks with separations between 5 and 18 stellar radii. Furthermore, all maps show a clear variation of the source structure within the observing time. We consider a number of hypothesis in order to explain such observations, mainly: magnetic reconnection in loops on the polar cap, a more general loop scenario and a close companion to AB Dor A.
Publisher
Cambridge University Press (CUP)
Subject
Astronomy and Astrophysics,Space and Planetary Science