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Pah formation in carbon-rich circumstellar envelopes
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Feigelson, Eric D. Frenklach, Michael |
| Copyright Year | 1989 |
| Description | While there is growing observational evidence that some fraction of interstellar carbon is in polycyclic aromatic hydrocarbons (PAH's), the mechanisms by which these molecules might be formed have not been extensively studied. A detailed investigation of PAH production in the outflowing molecular envelopes of carbon-rich red giant star is presented. The gasphase kinetics of a chemical reaction mechanism developed to study soot production in hydrocarbon flames is modified to apply in circumstellar environments. It was found that astrophysically significant quantities of PAH's can be formed in carbon star envelopes provided the gas is sufficiently dense and resides for a long time in the temperature range of 900 to 1100 k. The precise yield of PAH's is very sensitive to astronomical parameters of the envelope (e.g., mass loss rate, outflow velocity, and acetylene abundance) and certain poorly determined chemical reaction rates. |
| File Size | 171844 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910005702 |
| Archival Resource Key | ark:/13960/t9479953r |
| Language | English |
| Publisher Date | 1989-12-01 |
| Access Restriction | Open |
| Subject Keyword | Inorganic And Physical Chemistry Cyclic Hydrocarbons Stellar Envelopes Interstellar Chemistry Polycyclic Aromatic Hydrocarbons Molecular Clouds Aromatic Compounds Vapor Phases Reaction Kinetics Supergiant Stars Chemical Reactions Carbon Stars Interstellar Matter Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
