On the physical conditions in the "high-velocity" cloud near zeta Ori.
Abstract
The problem of the 'high-velocity' clouds is rediscussed. Recent OAO-C Copernicus observations of lines of four atoms and ions have been used to estimate the density and temperature in both the 'high-velocity' and 'normal' interstellar clouds in the line-of-sight to Zeta Ori. The temperature and densities in the normal cloud are similar to previous results for interstellar clouds, yielding temperatures of the order of 100 K and compositions underabundant relative to the sun by factors of 3 or more. The high-velocity cloud, however, is warmer (at least 1000 K) and appears to have a normal solar abundance.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1977
- Bibcode:
- 1977A&A....54..425D
- Keywords:
-
- Emission Spectra;
- Interstellar Matter;
- Oao 3;
- Spaceborne Astronomy;
- Abundance;
- Space Density;
- Temperature Distribution;
- Astrophysics