Abstract
ABSTRACT A model is developed to account for the spectroscopic, photometric and polarimetric observations of the Be star Omicron Andromedae during the recent shell episode. A static solution for electron density and hydrogen level populations within a circumstellar envelope is first presented in which the shell is assumed static at the start of the shell episode, when shell density and polarization were high. Consideration of the time-dependent aspects of the problem then results in models for the waning of the shell in terms of a decrease in the mass loss rate, which is not able to account for the time difference in inner and outer shell density decreases, or a time-variable expansion velocity law, which was found to be more successful.
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