R. Siebenmorgen 1, A. Natta 2, E. Krügel 3, & T. Prusti 1
1 ISO Science Operations Centre, Astrophysics Division of ESA, Villafranca del Castillo, P.O. Box 50727, E-28080 Madrid
2 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze
3 MPIfR, Auf dem Hügel, D-5300 Bonn
This paper presents spectro-photometric images of the
pre-main-sequence Herbig AeBe star HD 97300 in the mid-IR obtained with
ISOCAM on board of ISO. The images show extended emission, an
elliptical ring structure of size about 0.045
0.03 pc as well
as two peaks of emission, separated by about 3" (240 AU).
One of the two peaks coincides with the position of HD 97300, while the
other may be an embedded companion. The data show that the emission
in this region is dominated by the infrared emission bands centered at
6.2, 7.7, 8.7, 11.3 and 12.5 
m, with a very small contribution from
continuum emission at longer wavelengths. We fit the spectra with a
dust model including organic molecules such as polycyclic aromatic
hydrocarbons, very small graphite and very small silicates, as well as
large grains. The fit to the ISOCAM data is very good if one applies a
classical oscillator model for the infrared emission bands. Our
fitting procedure allows us to estimate the total mass of the ring,
which is 
0.03M
.
Its possible origin is briefly
discussed.