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RESEARCH PRODUCT
A large rotating structure around AB Doradus A at VLBI scale
J. M. MarcaideJ. B. ClimentJ. C. GuiradoRebecca Azulaysubject
PhysicsSource structure010308 nuclear & particles physicsStructure (category theory)Astronomy and AstrophysicsScale (descriptive set theory)Magnetic reconnectionAstrophysicsStar (graph theory)01 natural sciencesSpace and Planetary SciencePosition (vector)0103 physical sciencesVery-long-baseline interferometryVariation (astronomy)010303 astronomy & astrophysicsdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-06-01 | Proceedings of the International Astronomical Union |