NDLI: On the uncertainty of the transmission function of the optically thick AGB dust shells

Content Provider	Springer Nature Link
Author	Kocifaj, Miroslav Klačka, Jozef Posch, Thomas
Copyright Year	2008
Abstract	The uncertainty of the spectral transmission function due to the nonsphericity of cosmic dust particles is analysed for optically thick C-rich and O-rich dust shells. The transmission function directly prescribes the intensity of radiation that passes through a dust shell. It is shown that nonspherical particles affect the stellar spectra in a different way than a system of equally sized spherical particles. Discrepancies in the stellar spectra for both morphological models (spheres and irregular targets) grow with optical thickness of the dust shell and the spectral behaviour of the optical thickness depends on the particle size distribution function. In particular, two most frequently used distrubutions, a power law and Dirac’s delta function, are considered in the presented numerical runs. Light transmission through C-rich dust shells is strongly influenced by absorption which dominates in case of carbonaceous particles. Irregularly shaped carbonaceous particles reduce the intensity of stellar spectra more efficiently than spherical particles of the same composition (the difference is about 10–30%). MgO particles which may be present in O-rich dust shells are almost pure scatterers, thus the ratio of transmission functions for irregularly shaped particles and spherical ones show specific resonant features (especially at wavelengths below 0.4 μm).
Starting Page	31
Ending Page	38
Page Count	8
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	317
Issue Number	1-2
e-ISSN	1572946X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-07-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Circumstellar matter Infrared: stars Methods: radiative transfer Stars: AGB and post-AGB Stars: atmospheres Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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