Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt.........1a&link_type=abstract
PhD thesis, Faculity of Science, KULeuven (Leuven, Belgium), 234 pages
Other
2
Herbig Ae/Be Stars, Protoplanetary Disks, Ux Orionis Variability, Grain Growth, Pah, Forbidden Oxygen Emission, Keplerian Rotation
Scientific paper
The thesis contains amongst others a study of the entire ISO sample of 2-15 micron spectra of Herbig Ae/Be stars. We find a clear correlation between the presence of PAH features and the shape of the mid-IR spectral energy distribution. The latter is interpreted as an indication for the disk geometry. Flared-disk sources have strong PAH emission compared to their self-shadowed-disk counterparts, in agreement with the model prediction. Furthermore, we discuss the 10 micron silicate feature and the presence of crystalline silicates. We have observed the [O I] emission line at 6300Å in a sample of ~50 Herbig stars. The highestresolution spectra of some flared-disk sources show double-peaked line profiles. We have modeled the photodissociation of OH molecules in the surface of a flared disk. The emission of the excited oxygen atoms which are released in this process, together with the Keplerian rotation of the disk, can explain the shape and strength of the observed double-peaked [O I] lines. The other chapters in the thesis treat photospheric abundances in young stars, the link between UX Orionis variability and disk geometry, a search for (nano)diamond sources and a possible correlation between grain growth in the disk midplane and the disk geometry.
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