Abstract
view Abstract Citations (19) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Sympathetic stellar flares and electron precipitation as probes of coronal structure in flare stars. Mullan, D. J. Abstract We have previously suggested that sympathetic stellar flares might be triggered by a hydromagnetic (Moreton) wave propagating from one starspot to another. Electron cyclotron waves (whistlers) are expected to propagate with speeds exceeding Moreton wave speeds by factors of up to 30. We suggest that short-period (13 s) oscillations observed by Rodono during a large flare in the Hyades flare star H II 2411 are the whistler analog of sympathetic flares, and are due to electron precipitation triggered by whistlers propagating between starspots at opposite rotation poles of the star. According to this model, if starspot fields are as strong ( 10 gauss) as a recent starspot model suggests, then the coronal density at about 7-8 stellar radii in H II 2411 is in the range (0.5-10) x 106 . These densities are larger by factors of than the densities in the solar corona at 7-8 solar radii. Adopting ne = 2 x 106 at 7.5 stellar radii in the corona of a flare star thought to be very similar to H II 2411 (YZ CMi), we find that the coronal temperature in the flare star is lower than in the solar corona by a factor of 3-10. Using the Kennel-Petschek model originally developed for precipitation of electrons from the terrestrial radiation belts, we interpret Rodono's flare observations to mean that spectral indices of the differential energy spectrum of electrons in three flares on H II 2411 lie in the range 2.5 .0. Subject headings: stars: coronae - stars: flare Publication: The Astrophysical Journal Pub Date: March 1976 DOI: 10.1086/154199 Bibcode: 1976ApJ...204..530M Keywords: Coronas; Electron Precipitation; Flare Stars; Stellar Atmospheres; Stellar Flares; Stellar Structure; Astronomical Models; Earth Magnetosphere; Electron Density (Concentration); Magnetohydrodynamic Waves; Propagation Velocity; Astrophysics full text sources ADS | data products SIMBAD (2) Related Materials (1) Erratum: 1976ApJ...206..672M
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