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Dust Size Effect On IR Colors Of AGB Stars

Published online by Cambridge University Press:  01 April 2008

Huan Wang
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing 100875, P.R. China email: whbnu@mail.bnu.edu.cn, bjiang@bnu.edu.cn
B. W. Jiang
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing 100875, P.R. China email: whbnu@mail.bnu.edu.cn, bjiang@bnu.edu.cn
R. Szczerba
Affiliation:
Nicolaus Copernicus Astronomical Center, PL-87-100 Torun, Poland email: szczerba@ncac.torun.pl
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Abstract

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With the Mie theory and the radiative transfer model, we studied the effect of dust size on the infrared color indexes concerning special filters used in the space infrared missions and typical filters in the near-infrared, of AGB stars with typical oxygen-rich and carbon-rich dust shells. It is found the most affected bands are the near-infrared bands JHK and the Spitzer IRAC bands, meanwhile the wavebands with reference wavelength longer than 10 μm is little affected. The effect increases fast with the mass loss rate. We also discussed the potential to distinguish the O-rich and C-rich dusts, and the difference in IR colors between the AGB stars and other IR sources like YSOs and galaxies.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

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