We study two possibilities of the origin of quiescent X-ray emission from ultracool stars using the examples of brown dwarfs TVLM 513-46546 and VB 10: (a) radiation from hot coronas and (b) radiation from a system of magnetic loops filled with a sufficiently dense hot plasma heated due to the dissipation of electric currents flowing in the loops. The parameters of the corona, as well as the parameters of the loops and their number, which are necessary for the implementation of the observed X-ray emission measure, have been determined. For the studied brown dwarfs, the generation of X-rays by a set of hot loops is energetically more favorable than in the case of a hot corona, which was also confirmed by the results of the analysis of quiescent microwave radiation from the brown dwarf TVLM 513-46546.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 64, No. 6, pp. 419–429, June 2021. Russian DOI: 10.52452/00213462_2021_64_06_419
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Zaitsev, V.V., Stepanov, A.V. X-Ray Emission from Utracool Stars. Radiophys Quantum El 64, 379–387 (2021). https://doi.org/10.1007/s11141-022-10140-z
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DOI: https://doi.org/10.1007/s11141-022-10140-z