Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-31
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, to appear in the Proceedings of the ESO Workshop on High Resolution Infrared Spectroscopy in Astronomy, he
Scientific paper
10.1007/10995082_36
We present preliminary results of spectroscopic data obtained with the La Silla 3.6m TIMMI2 and the VLT-ISAAC instruments. We have obtained 23 TIMMI2 N-band and 18 Q-band spectra for our total sample of 36 stars in March 2003 to investigate the evolution of the grain properties in circumstellar disks. Our sample consists of Herbig stars, T Tauri stars and Vega-like stars, some of which have recently been identified to be members of nearby (<100 pc) stellar associations. Silicate and Polycyclic Aromatic Hydrocarbon (PAH) emission features are detected and the spatial resolution of TIMMI2 allowed to place upper limits on the spatial extent of the emission. We also obtained ISAAC L-band spectra of 4 well-studied disks. For the Herbig Be star HD 100546, we detect spatially extended PAH emission at 3.3 micron which corresponds to a source with radius 11 +/- 3 AU in this line.
Augereau J.-Ch.
Chauvin Gael
Geers Vincent Carlo
Kaufl Hans Ulrich
Lagrange Anne Marie
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