The argon abundance in the solar neighbourhood
Abstract
Argon abundance determinations from the solar corona, solar wind, H I gas, H II regions and hot stars are presented. Emphasis is placed on Ar in the H I gas, for which Ar abundances deduced from Copernicus observations towards 12 stars are plotted versus the amount of neutral hydrogen along the line of sight, as well as versus the interstellar reddening. Column densities of neutral Ar I are considered along with the saturated and weakly saturated lines of sight; also discussed is an apparent gradual decrease of the Ar abundance with N(H(n)) and with the E(B-V) reddening. A value of 9.0, within a factor of 1.7, is adopted for Ar on a scale of Si equal to 100, that is, Ar/H is equal to 3.3 x 10 to the -6th power, within a factor of 1.7, for the solar system.
- Publication:
-
Liege International Astrophysical Colloquia
- Pub Date:
- 1979
- Bibcode:
- 1979LIACo..22..477M
- Keywords:
-
- Abundance;
- Argon;
- Hot Stars;
- Solar Atmosphere;
- Solar Corona;
- Solar Wind;
- Error Analysis;
- H Ii Regions;
- Interstellar Matter;
- Line Spectra;
- Stellar Spectra;
- X Ray Astronomy;
- Solar Physics