Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8147
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dc.contributor.authorKuznetsov, A. A-
dc.contributor.authorKarakotov, R. R-
dc.contributor.authorChandrashekhar, K-
dc.contributor.authorBanerjee, D-
dc.date.accessioned2023-02-03T13:31:30Z-
dc.date.available2023-02-03T13:31:30Z-
dc.date.issued2023-01-
dc.identifier.citationResearch in Astronomy and Astrophysics, Vol. 23, No. 1, 015006en_US
dc.identifier.issn1674-4527-
dc.identifier.urihttp://hdl.handle.net/2248/8147-
dc.descriptionRestricted Accessen_US
dc.description.abstractWe present observations of the active M-dwarf binary AT Mic (dM4.5e+dM4.5e) obtained with the orbital observatory AstroSat. During 20 ks of observations, in the far-ultraviolet (130–180 nm) and soft X-ray (0.3–7 keV) spectral ranges, we detected both quiescent emission and at least five flares on different components of the binary. The X-ray flares were typically longer than and delayed (by 5–6 minutes) with respect to their ultraviolet counterparts, in agreement with the Neupert effect. Using X-ray spectral fits, we estimated the parameters of the emitting plasma. The results indicate the presence of a hot multi-thermal corona with average temperatures in the range of ∼7–15 MK and emission measure of ∼(2.9–4.5) × 1052 cm−3 ; both the temperature and the emission measure increased during the flares. The estimated abundance of heavy elements in the corona of AT Mic is considerably lower than at the Sun (∼0.18–0.34 of the solar photospheric value); the coronal abundance increased during the flares due to chromospheric evaporation. The detected flares had the energies of ∼1031–1032 erg; the energy-duration relations indicate the presence of magnetic fields stronger than in typical solar flares.en_US
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.relation.urihttps://doi.org/10.1088/1674-4527/aca190-
dc.rights© 2022. National Astronomical Observatories, CAS and IOP Publishing Ltd-
dc.subjectStars: coronaeen_US
dc.subjectStars: flareen_US
dc.subjectStars: late-typeen_US
dc.subjectX-rays: starsen_US
dc.subjectUltraviolet: starsen_US
dc.titleX-Ray and Ultraviolet Flares on AT Microscopii Observed by AstroSaten_US
dc.typeArticleen_US
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