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Induced nucleation of carbon dust in red giant starsThis study quantitatively tests the proposed model of induced nucleation of carbonaceous grains in carbon-rich red giant stars. Induced nucleation is the process of grain growth initiated by the presence of reactive surfaces provided by seed particles. The numerical study was performed using a deailed chemical kinetic model of carbon deposition, grain coagulation, and homogeneous nucleation of polycyclic aromatic hydrocarbons (PAHs). The model uses a method of moments to keep track of developing grain population in the forming dust shell. We test the efficiency of grain formation for large ranges of dust shell parameters typical for carbon stars. Our model is capable of producing a range of optically thick and thin dust shells in carbon stars. Results are in accord with (IRAS) spectral classes of carbon stars. The resulting composite grains produced are consistent with those recently found in ancient meteorites. This model also provides a realistic explanation for high abundances of (PAHs) in the interstellar medium and some planetary nebulae.
Document ID
19950037362
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cadwell, Brian J.
(Pennsylvania State Univ. University Park, PA, United States)
Wang, Hai
(Pennsylvania State Univ. University Park, PA, United States)
Feigelson, Eric D.
(Pennsylvania State Univ. University Park, PA, United States)
Frenklach, Michael
(Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1994
Publication Information
Publication: The Astrophysical Journal, Part 1
Volume: 429
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A68961
Funding Number(s)
CONTRACT_GRANT: NAGW-2280
Distribution Limits
Public
Copyright
Other

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