A NEW SUBGROUP OF HERBIG AEBE STARS

                                                    Abstract

This paper presents the results of a study of the spectral energy distribution curves (SED) of selected Herbig AeBe stars (HAeBeS) in the spectral range of 0.36-100 μm. It was shown that out of 48 program stars, 8 stars showed a weak residual IR emission, which is observed only in the wavelength range with λ≥10 μm. We called this subgroup "Weak Herbig AeBe stars" (WHAeBeS). Physical parameters of all studied stars were determined. It was shown that the SED of the selected subgroup of WHAeBe stars belongs to class III. Despite the youth of these stars, the reason for the relatively rapid dissipation of the circumstellar disk matter for selected WHAeBe stars is unclear.

Key words: Pre-Main sequence stars, circumstellar disks, HAeBe stars - planet formation processes, WHAeBe stars.