Showing papers by "Marco Spaans published in 1992"
TL;DR: In this paper, a Monte Carlo method is used to solve the radiative transport in circumstellar OH masers, and the observed double-peaked 1612-MHz maser emission from expanding molecular shells around highly evolved stars.
Abstract: A Monte Carlo method is used to solve the radiative transport in circumstellar OH masers. In this way we model the observed double-peaked 1612-MHz maser emission from expanding molecular shells around highly evolved stars. Earlier attempts to describe in detail the shape of the spectra have had limited success, because of the complexity of the radiative transfer problem, in that the radiation of the maser couples to the population inversion which, together with the global geometry of the model, determines the radiation field
16 citations