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The circumstellar silicate dust as seen by IRAS. II : Evolution of circumstellar envelopes

Pedro David, R. Papoular

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Abstract

We have set ourselves the task of modeling the IRAS objects in the LRS classes 3n and 7n, i.e. those with a 10 μm feature in absorption. This was not possible within the framework of the usual model of circumstellar dust distributed in r −1 which previously proved to be successful in modeling class 2n. Guided by the shorter wavelengths of the LRS as well as the longer photometric wavelengths of IRAS, we developed a model characterized by (1) an optically thick and geometrically thin, warm, envelope at the dust condensation radius, and (2) a detached, cool, outer shell

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What this paper is about

We have set ourselves the task of modeling the IRAS objects in the LRS classes 3n and 7n, i.e. those with a 10 μm feature in absorption. This was not possible within the framework of the usual model of circumstellar dust distributed in r −1 which previously proved to be successful in modeling class 2n. Guided by the shorter wavelengths of the LRS as well as the longer photometric wavelengths of IRAS, we developed a model characterized by (1) an optically thick and geometrically thin, warm, envelope at the dust condensation radius, and (2) a detached, cool, outer shell

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Available abstract

We have set ourselves the task of modeling the IRAS objects in the LRS classes 3n and 7n, i.e. those with a 10 μm feature in absorption. This was not possible within the framework of the usual model of circumstellar dust distributed in r −1 which previously proved to be successful in modeling class 2n. Guided by the shorter wavelengths of the LRS as well as the longer photometric wavelengths of IRAS, we developed a model characterized by (1) an optically thick and geometrically thin, warm, envelope at the dust condensation radius, and (2) a detached, cool, outer shell

Key concepts: Circumstellar dust, Physics, Circumstellar envelope, Astrophysics, Circumstellar disk, Extinction (optical mineralogy), RADIUS, Cosmic dust

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