Institute of Astronomy K.U. Leuven, Celestijnenlaan 200 B, B-3001 Leuven, Belgium
We present ISO-SWS observations of two Herbig AeBe stars HD97048 and Elias 1. Besides the well-known family of IR emission bands at 3.3, 6.2, ``7.7'',8.7 and 11.3 /mu these objects show strong anomalous emission features at 3.43 and 3.53 /mu. The striking similarity of the latter two features in these two sources points toward one specific carrier or one specific family of carriers. In the poster we review the carriers proposed by Schutte et al. (1990) based upon our new spectra combined with earlier data.