dc.contributor.author |
Kuznetsov, A. A. |
|
dc.contributor.author |
Karakotov, R. R. |
|
dc.contributor.author |
Chandrashekhar, K. |
|
dc.contributor.author |
Banerjee, D. |
|
dc.date.accessioned |
2024-03-14T05:41:53Z |
|
dc.date.available |
2024-03-14T05:41:53Z |
|
dc.date.issued |
2023-01 |
|
dc.identifier.uri |
https://doi.org/10.1088/1674-4527/aca190 |
|
dc.identifier.uri |
http://localhost:8080/xmlui/handle/123456789/1522 |
|
dc.description.abstract |
We 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.iso |
en |
en_US |
dc.publisher |
Research in Astronomy and Astrophysics |
en_US |
dc.relation.ispartofseries |
1942;raa23-015006 |
|
dc.subject |
stars: coronae |
en_US |
dc.subject |
stars: flare |
en_US |
dc.subject |
stars: late-type |
en_US |
dc.subject |
X-rays: stars |
en_US |
dc.subject |
ultraviolet: stars |
en_US |
dc.title |
X-Ray and Ultraviolet Flares on AT Microscopii Observed by AstroSat |
en_US |
dc.type |
Article |
en_US |