Oscillations of Optical Emission from Flare Stars and Coronal Loop Diagnostics

Details Oscillations of Optical Emission from Flare Stars and Coronal Loop Diagnostics Oscillations of Optical Emission from Flare Stars and Coronal Loop Diagnostics

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31..612s&link_type=abstract

Astronomy Letters, vol. 31, Issue 9, p.612-619

Astronomy and Astrophysics

Astronomy

8

Stars&#8212, Variable And Peculiar - Stellar Flares - Coronal Loops - Oscillations - Ev Lac - Plasma Diagnostics

Scientific paper

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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