2006MNRAS.372.1299T

We report long-slit spectroscopic observations of the Herbig Ae/Be star Elias 1 in the 3.2-3.6 µm region covering the C-H stretch emission features of hydrogen-terminated diamonds and polycyclic aromatic hydrocarbons (PAHs). The data were recorded at the United Kingdom Infrared Telescope using the UKIRT Imaging Spectrometer (UIST) and yield information on the profiles and intensities of the bands as a function of offset along the NS and EW axes centred on the close binary. The diamond and nearby infrared continuum emission arises from a symmetrical inner core region (≤0.34 arcsec or 48 au). The 3.3-µm PAH emission is extended along the EW axis up to ca. 100 au each side of the star. This result supports a suggestion of Haas, Leinert & Richichi of an EW oriented bipolar nebula in Elias 1.