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Dust Composition in the Low Density Medium Around Spica

Published online by Cambridge University Press:  12 April 2016

F. Zagury ,
A. Jones  and
F. Boulanger
F. Zagury
Affiliation:
Institut d’Astrophysique Spatiale Université Paris-Sud, Bâtiment 121, F-91405 Orsay Cedex, France
A. Jones
Affiliation:
Institut d’Astrophysique Spatiale Université Paris-Sud, Bâtiment 121, F-91405 Orsay Cedex, France
F. Boulanger
Affiliation:
Institut d’Astrophysique Spatiale Université Paris-Sud, Bâtiment 121, F-91405 Orsay Cedex, France

Abstract

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Dust grains in low density gas are subjected to sputtering and shattering in fast supernovae shocks. Although there has been extensive modelling of the dust destruction, still little is known about the grains which survive. Jones et al. (1996) have modeled the effect of the destruction processes on the size distribution of grains. They predict that fast J shocks are efficient in grinding large dust grains into smaller particles. We present observations of the dust emission around the nearby star Spica. Comparison of the observations to the infrared emission of ’standard’ cirrus suggest that the abundance of very small grains is significantly enhanced.

Type
Part VI Distant Hot Gas, SXRB Fluctuations, Dust, Gamma-rays
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 385 - 388
Copyright
Copyright © Springer-Verlag 1998

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