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Composite Grains: Carriers of the Diffuse Interstellar Bands

Published online by Cambridge University Press:  21 February 2014

D. B. Vaidya  and
R. Gupta
D. B. Vaidya
Affiliation:
Indian Centre for Climate and Societal Impacts Research, ICCSIR Ahmedabad, 380009India email: deepak.vaidya@iccsir.org
R. Gupta
Affiliation:
Inter University Centre for Astronomy and Astrophysics, IUCAA Pune, 411007India email: rag@iucaa.ernet.in
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Abstract

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The dust grains flowing out of the stars are most likely non-spherical and inhomogeneous; viz. porous, fluffy and composites of many very small particles glued together. We calculate the scattering, absorption and extinction efficiencies of such composite grains. The composite grains consist of host silicate spheroid and inclusions of PAHs. We study the extinction as a function of the volume fraction of the inclusions. In particular, we study the variation in the absorption peak, at the wavelength ‘4430Å’ with the volume fraction of the PAH inclusions. We present the composite grain models and discuss the results.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 384 - 386
Copyright
Copyright © International Astronomical Union 2014 

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