Mathematics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phdt.........1h&link_type=abstract
Ph.D. Thesis Texas Univ., Austin.
Mathematics
7
A Stars, Coronal Loops, Flare Stars, Giant Stars, Hydrostatics, Spectral Resolution, Stellar Flares, Stellar Models, X Ray Irradiation, Balmer Series, Conductive Heat Transfer, Energy Budgets, Heating, Hydrogen, Iue, Mathematical Models, Observatories, Radiative Transfer, Steady State, Telescopes, Temporal Resolution
Scientific paper
Multi-wavelength observations of a giant flare on the star AD Leo were obtained with the 2.1m and 0.9m telescopes at McDonald Observatory and the International Ultraviolet Explorer satellite. The quality, spectral coverage and time resolution of the data represent a major improvement over any published stellar flare data. A self-consistent theoretical model was developed to investigate the effects of chromospheric heating by thermal conduction and soft x ray irradiation from a flare heated corona. Assuming a one-dimensional coronal loop geometry, atmospheres were produced for overlying coronal temperatures of 8, 10, 15, and 20 million degrees Kelvin. The atmospheres satisfy the equations of hydrostatic equilibrium, steady state energy balance, and statistical equilibrium and radiative transfer in many optically thick transitions of hydrogen, ionized calcium and ionized magnesium. A second theoretical model was then developed to predict the temporal evolution of the coronal temperature under the influence of a time varying flare heating rate. Combining the models, the chromospheric emission model preductions in the hydrogen Balmer lines, Ca II K, Mg II h + k and the optical continuum were compared to the observations, with the result that much of the gradual phase flare emission could be produced by the x ray and conductive heated atmospheres.
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