Pulsations of optical radiation during the flare of YZ CMi occurred on February 9, 2008 |
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Authors: | B E Zhilyaev Yu T Tsap M V Andreev A V Stepanov Yu G Kopylova R E Gershberg M N Lovkaya A V Sergeev I A Verlyuk K O Stetsenko |
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Institution: | 1.Main Astronomical Observatory,National Academy of Sciences of Ukraine,Kiev,Ukraine;2.Crimean Astrophysical Observatory Research Institute,Nauchnyi,Crimea, Ukraine;3.International Center for Astronomical, Medical, and Ecological Research,National Academy of Sciences of Ukraine and Russian Academy of Sciences,Kiev,Ukraine;4.Central Astronomical Observatory at Pulkovo,Russian Academy of Sciences,St. Petersburg,Russia |
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Abstract: | One of the most powerful and long-lived flares on the active red dwarf YZ CMi is considered. The flare was observed in the
U band at the Terskol Peak Observatory on February 9, 2008. During the formation of the flare over the course of 30 seconds,
the flare-induced stellar luminosity increased and became more than 180 times the preflare value. The total duration of the
flare was approximately one hour. At the flare maximum, quasi-periodic pulsations having a specified period of approximately
11 s, an initial modulation depth of 5.5%, and an exponential damping time of 29 s were discovered using wavelet analysis.
Assuming that the pulsations were caused by fast magnetohydrodynamic oscillations of a flare loop, the following parameters
were determined in the region of energy release using coronal seismology methods: plasma concentration (2 × 1010 cm−3), temperature (3 × 107 K), and magnetic field strength (0.015 T). |
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