Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992iraj...20..213h&link_type=abstract
Irish Astronomical Journal (ISSN 0021-1052), vol. 20, no. 4, p. 213-249.
Astronomy and Astrophysics
Astronomy
20
Astronomical Spectroscopy, Stellar Atmospheres, Stellar Flares, Stellar Spectra, Stellar Spectrophotometry, Fine Structure, Line Spectra, Red Dwarf Stars, Spectral Bands, Stellar Composition, Stellar Models, Temporal Resolution
Scientific paper
The question of simultaneous broadband photometry and medium resolution spectroscopy can provide new constraints for modeling stellar flares is addressed. The spectral features of flares on AD Leonis, Proxima Centauri, YZ Canis Minoris, and UV Ceti are examined. It is shown that during the impulsive phase, Balmer line fluxes correlate with the white light flux over orders of magnitude. A clear trend is observed for the FWHM to increase with white light intensity. The investigation of the broadening mechanisms of the CaII K, Balmer series, and HeI 4026 A diffuse triplet lines shows that the flare is made up of several components with quite different electron densities, from 10 exp 11/cu cm to 10 exp 17/cu cm or more. It is inferred that backwarming and/or particle beams penetrate down to the photosphere. It is shown that electrons in the MeV energy range are likely to be produced in stellar coronae. The atmospheric temperature rise due to direct beam heating is computed, and constraints on the beam column density are inferred.
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