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A large rotating structure around AB Doradus A at VLBI scale

Published online by Cambridge University Press:  24 September 2020

J. B. Climent Open the ORCID record for J. B. Climent [Opens in a new window] ,
J. C. Guirado ,
R. Azulay  and
J. M. Marcaide
J. B. Climent
Affiliation:
Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, 46100 Burjassot, València, Spain email: [email protected]
J. C. Guirado
Affiliation:
Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, 46100 Burjassot, València, Spain email: [email protected] Observatori Astronòmic, Universitat de València, Parc Científic, C. Catedrático José Beltrán 2, 46980 Paterna, València, Spain
R. Azulay
Affiliation:
Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, 46100 Burjassot, València, Spain email: [email protected]
J. M. Marcaide
Affiliation:
Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, 46100 Burjassot, València, Spain email: [email protected]
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Abstract

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We 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.

Keywords

stars: pre–main-sequencestars: rotationstars: imagingstars: magnetic fieldsstars: flareradio continuum: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 189 - 194
Copyright
© International Astronomical Union 2020

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