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Astron. Astrophys. 349, 907-911 (1999)


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2D radiative transfer with transiently heated particles for the circumstellar environment of Herbig Ae/Be stars

V. Manske and Th. Henning

Astrophysical Institute and University Observatory Jena, Schillergässchen 3, D-07745 Jena, Germany (manske, henning@astro.uni-jena.de)

Received 22 April 1999 / Accepted 21 May 1999

Abstract

We present results of self-consistent 2D radiative transfer calculations for Herbig Ae/Be stars. The emission from transiently heated particles and PAHs is included in these calculations. Special attention is paid to the influence of the model parameters on the strength of the PAH emission lines.

Our calculations show that appropriate 2D radiative transfer calculations are necessary in order to draw appropriate conclusions concerning the origin of the IR emission of Herbig Ae/Be stars and the mechanisms that may suppress the PAH emission lines. If one is concerned with the effect of accretion discs and transiently heated dust grains on the spectral energy distributions, 1D calculations can lead to inappropriate conclusions.

Furthermore, no combination of model parameters has been found that results in undetectably weak PAH emission lines. Hence, PAH emission should always be detectable in radiation from Herbig Ae/Be disk/envelope systems if PAHs are present in these systems.

Key words: radiative transfer – methods: numerical – stars: emission-line, Be – ISM: dust, extinction – ISM: molecules – infrared: stars


© European Southern Observatory (ESO) 1999

Online publication: September 13, 1999

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