Density sensitive C II lines in cool stars of low gravity.
Abstract
It is shown that the relative intensities of emission lines within the multiplet UV 0.01 of C II, around 2325 A, are sensitive to electron density in the range 10 to the 9th to 10 to the 7th per cu cm. The lines therefore offer a valuable method for measuring electron densities in the chromospheres of late-type giants and supergiants. Calculated line ratios are compared with those observed in a range of objects.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 1981
- DOI:
- 10.1093/mnras/196.1.47P
- Bibcode:
- 1981MNRAS.196P..47S
- Keywords:
-
- Carbon;
- Cool Stars;
- Emission Spectra;
- Giant Stars;
- Line Spectra;
- Stellar Gravitation;
- Stellar Spectra;
- Supergiant Stars;
- Atmospheric Density;
- Chromosphere;
- Electron Density (Concentration);
- Stellar Atmospheres;
- Stellar Temperature;
- Astrophysics