Some O I oscillator strengths and the interstellar abundance of oxygen.
Abstract
Calculated and experimental oscillator strengths for the O I intersystem line at 1356 A and for other O I lines of interest in interstellar absorption-line studies are discussed. Attention is given to experimental f-values for the lines at 1302, 1305, and 1306 A, previous work on the f-values for the lines at 1356 and 1359 A, wave-function expansion, and calculations for permitted as well as intercombination lines. Copernicus observations of several interstellar absorption lines due to O I, C II, P II, and Ni II toward Zeta Oph are reported, equivalent widths are determined, and a curve-of-growth analysis is performed for the O I absorption lines. Oscillator strengths are recommended for the far-UV resonance lines of O I, and it is concluded that the oxygen in the interstellar H I regions toward Zeta Oph is depleted by 45% to 69%.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- December 1977
- DOI:
- 10.1093/mnras/181.3.527
- Bibcode:
- 1977MNRAS.181..527Z
- Keywords:
-
- Absorption Spectra;
- Abundance;
- Interstellar Gas;
- Oxygen Spectra;
- Gas Density;
- H I Regions;
- Hydrogen;
- Interstellar Radiation;
- Line Spectra;
- Molecular Oscillators;
- Spectral Line Width;
- Astrophysics