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The dust composition of discs surrounding isolated Herbig Ae/Be stars

Published online by Cambridge University Press:  26 May 2016

G. Meeus ,
J. Bouwman ,
L.B.F.M. Waters ,
C. Waelkens  and
M.E. van den Ancker
G. Meeus
Affiliation:
Astronomical Institute, K. U. Leuven, Celestijnenlaan 200B, B-3001 Leuven, Belgium
J. Bouwman
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, The Netherlands
L.B.F.M. Waters
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, The Netherlands
C. Waelkens
Affiliation:
Astronomical Institute, K. U. Leuven, Celestijnenlaan 200B, B-3001 Leuven, Belgium
M.E. van den Ancker
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS 42, Cambridge, MA 02138, USA

Abstract

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We present Infrared Space Observatory (ISO) spectra of 14 isolated Herbig Ae/Be stars. The IR spectra were combined with photometric data from the UV to the sub-mm region. We defined two key groups, based upon the spectral shape of the IR region. The results can be summarized as follows (see also Meeus et al. 2001): (1) the continuum of the IR to sub-mm region can be reconstructed by the sum of a power-law and a cool component, which can be represented by a black body. Possible locations for these components are an optically thick, geometrically thin disc (power-law component) and an optically thin flared region (black body); (2) remarkably, some sources lack the silicate bands; (3) PAH bands are present in at least 50% of our sample; with one exception, PAHs are not present in sources which only show a power-law continuum in the IR; (4) the dust in HAEBE stars shows strong evidence for coagulation; this dust processing is unrelated to any of the central star properties.

Type
Part IV: Protoplanetary and β Pic disks
Information
Symposium - International Astronomical Union , Volume 202: Planetary Systems in the Universe – Observation, Formation and Evolution , 2004 , pp. 356 - 358
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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