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Astron. Astrophys. 327, 1147-1154

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Circumstellar grains:
radiation pressure and temperature distribution

P.L. Lamy1 and J.-M. Perrin2

1Laboratoire d'Astronomie Spatiale CNRS, BP 8, F-13376 Marseille, France
2Observatoire de Haute-Provence, CNRS, F-04870 Saint-Michel l'Observatoire, France

Recerived 12 November 1996 / Accepted 11 July 1997


The ratio $\beta$ of the radiation pressure force to the gravitational attraction is calculated for circumstellar grains. Eleven stars of various spectral type are considered and their spectral flux compiled from available data sometimes supplemented by appropriate models. The materials composing the grains are a silicate (obsidian), organic materials (ice tholin, poly-HCN), graphite and glassy carbon. The radius of the grain extends from 0.005 to 25 µm. $\beta$ exceeds 1 for submicronic grains around the hottest stars with the exception of the obsidian grains. As far as the coldest stars are concerned, the results are not so clear and depend sharply on the illuminating stars as well as the nature of the material of the solid particles. Their temperatures are also studied and two examples are given for obsidian and graphite grains of radii 0.01, 0.1, 1 and 10 µm. Our results are of interest for thin stellar shells such as exo-zodiacal clouds and for the inner region of dense shells where multiple scattering effects are not taking place.

Key words: circumstellar matter - stars: AGB, post-AGB - stars: carbon

Send offprint requests to: P.L. Lamy

© European Southern Observatory (ESO) 1997

Online publication: October 20, 1997
Last change: April 6, 1998