Mid-IR Imaging and Modelling of AGB Circumstellar Envelopes

Authors: Marengo, M.; Busso, M.; Persi, P.; Lagage, P.O.; Silvestro, G.

Source: Astrophysics and Space Science, Volume 251, Numbers 1-2, July 1997 , pp. 251-254(4)

Publisher: Springer

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Abstract:

We present new mid-IR images of AGB and post-AGB circumstellar envelopes (CSEs) obtained with the 10-20 µm imaging camera CAMIRAS mounted at the TIRGO infrared telescope (Gornergrat, Switzerland). Diffraction limited images of the sources are obtained, and extended emission for the brightest sources is detected for several arcseconds. Simple radiative transfer modelling is necessary to fit the observed data and derive the physical and chemical state of the envelope. This kind of analysis is an important test for dust formation theories, because it gives indications of dust properties along their condensation path through the envelope.

Document Type: Research article

DOI: http://dx.doi.org/10.1023/A:1000714907445

Publication date: 1997-07-01