Observations and modelling of a large optical flare on AT Microscopii
| Autor: | Armagh Observatory, C. J. Butler, Astronomical Observatory, David Garcia-Alvarez, D. Jevremovic, J. G. Doyle |
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| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
Physics
Electron density Solar flare Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) FOS: Physical sciences Balmer series Astronomy and Astrophysics Astrophysics Plasma law.invention Atmosphere symbols.namesake Space and Planetary Science law Magnitude (astronomy) Physics::Space Physics symbols Electron temperature Astrophysics::Solar and Stellar Astrophysics Flare |
| Popis: | Spectroscopic observations covering the wavelength range 3600--4600\AA are presented for a large flare on the late type M dwarf AT Mic (dM4.5e). A procedure to estimate the physical parameters of the flaring plasma has been used which assumes a simplified slab model of the flare based on a comparison of observed and computed Balmer decrements. With this procedure we have determined the electron density, electron temperature, optical thickness and temperature of the underlying source for the impulsive and gradual phases of the flare. The magnitude and duration of the flare allows us to trace the physical parameters of the response of the lower atmosphere. In order to check our derived values we have compared them with other methods. In addition, we have also applied our procedure to a stellar and a solar flare for which parameters have been obtained using other techniques. Comment: 11 pages, 8 tables, accepted by A&A |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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