Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..593p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 2, p. 593-598
Astronomy and Astrophysics
Astronomy
31
A Stars, B Stars, Cosmic Dust, Emission Spectra, Infrared Astronomy, Infrared Spectra, Pre-Main Sequence Stars, Stellar Envelopes, Stellar Models, Bolometers, Infrared Photometry, Radiative Transfer, Reflecting Telescopes, Spectral Energy Distribution
Scientific paper
We have observed 7 young intermediate mass stars in the mid-infrared with two diaphragms of different sizes in order to detect extended emission. The mid-infrared part of the spectral energy distribution of HD 97048, HD 97300, and HD 176386 is dominated by extended emission. The extended mid-infrared emission can best be explained with emission from large molecules and small grains in a dust shell with a large inner cavity devoid of small particles. The 4 strong mid-infrared sources of our sample (T CrA, R CrA, HD 104237 and IRAS 12496-7650) are dominated by emission within the smallest diaphragm (5.4 sec) used in this work. When extended emission around Herbig Ae/Be stars is present, it contributes significantly to the mid-infrared luminosity and must be taken into account both in future observational and theoretical studies.
Natta Antonella
Palla Fabrizio
Prusti Timo
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