Oscillations of optical emission from flare stars and coronal loop diagnostics |
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| Authors: | A V Stepanov Yu G Kopylova Yu T Tsap E G Kupriyanova |
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| Institution: | (1) Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, St. Petersburg, 196140, Russia;(2) Crimean Astrophysical Observatory, p/o Nauchnyi, Crimea, 98409, Ukraine |
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| Abstract: | Based on an analogy between stellar and solar flares, we investigate the ten-second oscillations detected in the U and B bands on the star EV Lac. The emission pulsations are associated with fast magnetoacoustic oscillations in coronal loops. We have estimated the magnetic field, B ≈ 320 G; the temperature, T ≈ 3.7 × 107 K; and the plasma density, n ≈ 1.6 × 1011 cm?3, in the region of energy release. We provide evidence suggesting that the optical emission source is localized at the loop footpoints. |
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| Keywords: | stars— variable and peculiar stellar flares coronal loops oscillations EV Lac plasma diagnostics |
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