Numerical simulations of flares on M dwarf stars. I - Hydrodynamics and coronal X-ray emission

Abstract

view Abstract Citations (12) References (47) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Numerical Simulations of Flares on M Dwarf Stars. I. Hydrodynamics and Coronal X-Ray Emission Cheng, Chung-Chieh ; Pallavicini, Roberto Abstract Flare-loop models are utilized to simulate the time evolution and physical characteristics of stellar X-ray flares by varying the values of flare-energy input and loop parameters. The hydrodynamic evolution is studied in terms of changes in the parameters of the mass, energy, and momentum equations within an area bounded by the chromosphere and the corona. The zone supports a magnetically confined loop for which processes are described including the expansion of heated coronal gas, chromospheric evaporation, and plasma compression at loop footpoints. The intensities, time profiles, and average coronal temperatures of X-ray flares are derived from the simulations and compared to observational evidence. Because the amount of evaporated material does not vary linearly with flare-energy input, large loops are required to produce the energy measured from stellar flares. Publication: The Astrophysical Journal Pub Date: November 1991 DOI: 10.1086/170645 Bibcode: 1991ApJ...381..234C Keywords: Dwarf Stars; Flare Stars; M Stars; Stellar Coronas; Stellar Models; X Ray Stars; Computational Astrophysics; Digital Simulation; Hydrodynamics; Late Stars; Astrophysics; HYDRODYNAMICS; STARS: CORONAE; STARS: FLARE; STARS: LATE-TYPE; STARS: X-RAYS full text sources ADS | data products SIMBAD (4)