The transition region structure of kap Cet.

Abstract

Ultraviolet emission lines of Kappa Ceti (HD 20630), obtained with the IUE satellite, are analyzed in order to study the higher chromospheric, transition region and the low corona structure. Three models are derived for the emission measurement distribution, and the best fit model has a pressure of log P_e equals 14.96 at log T_e equals 5.2, since the pressure-temperature distribution is more linear and the region height is approximately 800 km, which is consistent with the assumptions made initially. The energy balance shows that the transport of energy by conduction is negligible when compared with the radiation losses, which, at all heights, are greater than those from the sun.