Loading...
Please wait, while we are loading the content...
Similar Documents
Why do interstellar grains exist?
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hollenbach, D. J. Seab, C. G. Tielens, Alexander G. G. M. McKee, C. F. |
| Copyright Year | 1986 |
| Description | There exists a discrepancy between calculated destruction rates of grains in the interstellar medium and postulated sources of new grains. This problem was examined by modelling the global life cycle of grains in the galaxy. The model includes: grain destruction due to supernovae shock waves; grain injection from cool stars, planetary nebulae, star formation, novae, and supernovae; grain growth by accretion in dark clouds; and a mixing scheme between phases of the interstellar medium. Grain growth in molecular clouds is considered as a mechanism or increasing the formation rate. To decrease the shock destruction rate, several new physical processes, such as partial vaporization effects in grain-grain collisions, breakdown of the small Larmor radius approximation for betatron acceleration, and relaxation of the steady-state shock assumption are included. |
| File Size | 53469 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19860014048 |
| Archival Resource Key | ark:/13960/t9f52jp0c |
| Language | English |
| Publisher Date | 1986-01-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Shock Waves Nucleation Supernovae Extinction Abundance Models Stellar Evolution Particles Sputtering 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 |
