Electron Density Diagnostics for Late-Type Stellar Atmospheres
Abstract
R-matrix calculations of electron excitation rates in C III, O III, and Si IV have been used to obtain several theoretical emission-line ratios for a range of electron temperatures and densities applicable to late-type stellar atmospheres. Data are derived for the ratios I(C III 1908 A)/I(O III 1666 A), I(O III 1666 A)/I(Si IV 1402 A), and I(C III 1908 A)/I(Si IV 1402 A). It is suggested that differences found between the results and those of Doschek et al. (1978) are due to the present adoption of improved atomic data.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1988
- DOI:
- 10.1086/165963
- Bibcode:
- 1988ApJ...324.1068K
- Keywords:
-
- Electron Density (Concentration);
- Late Stars;
- Plasma Diagnostics;
- Stellar Atmospheres;
- Stellar Spectra;
- Ultraviolet Spectra;
- Carbon;
- Electron Energy;
- Emission Spectra;
- Oxygen;
- Silicon;
- Astrophysics;
- ATOMIC PROCESSES;
- STARS: ATMOSPHERES;
- STARS: LATE-TYPE;
- ULTRAVIOLET: SPECTRA