Other
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt.......144m&link_type=abstract
PhD Thesis, Leuven: K.U.Leuven, 2001, 181 pages
Other
Circumstellar Matter, Stars: Pre-Main Sequence, Infrared: Ism: Lines And Bands, Solar System: Formation
Scientific paper
In this work, we study the properties of the circumstellar (CS) environment of young intermediate-mass Herbig Ae/Be stars (HAEBEs). This is mostly done through observations in the infrared (ISO-SWS spectra), but also other wavelength regions are used. The effect of the CS environment on optical spectra and variability of HAEBEs is studied by comparing spectra and photometry of HD139614, HD142666 and HD144432. It is shown that, under the assumption of a disc-like morphology, the inclination of the disc has an important effect on how a star appears to the observer; from this study the viewing angle for these objects could be constrained. We classify a sample of 14 HAEBEs based on their infrared appearance. We analyse and compare their spectral energy distributions (SEDs) and IR spectra. We show that the SEDs can be decomposed into at maximum three components: a power-law, solid state bands and a black-body. Based on this decomposition and the presence of the different components, two main groups are defined; these groups are furtheron subdivided based upon the presence/absence of the 10 micron silicate feature. The different SED components are furtheron associated with different locations in a disc, and a geometrical model is presented, in which a flaring disc plays a key role. The presence of polycyclic aromatic hydrocarbons (PAHs) appears to be coupled to the presence of a flared region around the mid-plane disc. From the slope of the SED in the millimetre we derive that the dust around HAEBEs is coagulated. The absence of the 10 micron silicate feature around severval isolated HAEBEs is studied by modelling HD100453 with an optically thin radiative transfer code. We show that the the absence of the feature can be explained by a size or a temperature effect.
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