EDP Sciences
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Volume 418, Number 1, April IV 2004
Page(s) 177 - 184
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20034331

A&A 418, 177-184 (2004)
DOI: 10.1051/0004-6361:20034331

Spatially and spectrally resolved 10  $\mu$m emission in Herbig Ae/Be stars

R. van Boekel1, 2, L. B. F. M. Waters1, 3, C. Dominik1, C. P. Dullemond4, A. G. G. M. Tielens5 and  A. de Koter1

1  Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
2  European Southern Observatory, Karl-Schwarzschildstrasse 2, 85748 Garching bei München, Germany
3  Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium
4  Max-Planck-Institut für Astrophysik, Karl-Schwarzschildstrasse 1, Postfach 1317, 85748 Garching bei München, Germany
5  Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands

(Received 17 September 2003 / Accepted 23 January 2004)

We present new mid-infrared spectroscopy of the emission from warm circumstellar dust grains in the Herbig Ae stars HD 100546, HD 97048 and HD 104237, with a spatial resolution of $\approx$0 $\farcs$9. We find that the emission in the UIR bands at 8.6, 11.3 and (HD 97048 only) 12.7  $\mu$m is extended in the first two sources. The continuum emission is resolved in HD 97048 and possibly in HD 100546. HD 104237 is not spatially resolved in our observations. We find that the UIR emission in HD 100546 and HD 97048 is extended on a scale of (several) 100 AU, corresponding to the outer disk scale in flaring disk models. Small carbonaceous particles are the dominant source of opacity in the HD 97048 disk.

Key words: circumstellar matter -- stars: pre-main sequence -- infrared: ISM -- ISM: lines and bands

Offprint request: R. van Boekel, vboekel@science.uva.nl

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