The spectral energy distribution, the photometric behaviour and spectral lines of the Herbig Ae stars HD 139614, HD 142666 and HD 144432 were analysed. From this analysis, it became clear that in sé these three stars are almost identical: their SED and spectral type are much alike. The observed differences in spectral features, CS extinction and photometric variability can be very well explained by assuming a different viewing angle for a circumstellar disk whose morphology is very similar in the three cases.
In the introduction, it was stated that the modeling of the SEDs of Haebe stars leads to conflicting results, and that additional observations of different kinds are necessary as further constraints. Among these observations, studies of the variability of the circumstellar absorption and emission appear to be useful.
© European Southern Observatory (ESO) 1998
Online publication: November 24, 1997