Circumstellar Absorption and Emission in the Post-AGB Stars HR4049 and HD213985
Waters, L. B. F. M.; Van Winckel, H.; Waelkens, C.; Daems, K.
Belgium, Netherlands
Abstract
The evolved C-rich low-mass stars HR 4049 and HD 213985 present variable circumstellar extinction and emission. Observations of HR 4049 strengthen the link between the far-UV extinction rise and the presence of small C-rich particles. Variability of the UV absorption bump in HD 213985 is reported here for the first time and is discussed.