Abstract
This paper reviews spectra obtained with the SWS on board of ISO of dust shells around O-rich objects. These spectra reveal the presence of many new emission features between 10 and 45 mu m. These bands are generally much narrower than the well-known 10 and 20 mu m silicates features. The strength of these features relative to the underlying broad continuum varies from source to source (similar or equal to 5-50%). The 10 mu m region shows evidence for the presence of Al(2)O(3) grains. At longer wavelength, the spectra are dominated by features due to crystalline olivine and pyroxene. The exact peak position of these features shows that the emitting grains consist of the Mg-rich end-members of these minerals with an Fe-content of
| Original language | English |
|---|---|
| Pages (from-to) | 415-426 |
| Number of pages | 12 |
| Journal | Astrophysics and Space Science |
| Volume | 255 |
| Issue number | 1-2 |
| Publication status | Published - 1998 |
| Event | International Conference on ISOs View on Stellar Evolution - , Netherlands Duration: 1-Jul-1997 → 4-Jul-1997 |
Keywords
- MIRA VARIABLES
- DUST SHELLS
- EMISSION
- CONSTRAINTS
- STEPS