Excitation of high Balmer lines case C of Aller, Baker and Menzel
Abstract
In case C of Aller, Baker & Menzel (1939) it is supposed that absorption of stellar radiation in spectrum lines contributes to the excitation of Balmer lines observed in gaseous nebulae. Calculations are made of the ratio, for various levels n of the H atom, Rn = (number of excitations by line absorption)! (number of excitations by recombination). It is found that these ratios are small and it is concluded that the case C mechanism cannot explain the anomalous intensities which have been reported for the high Balmer lines.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- 1969
- DOI:
- 10.1093/mnras/145.1.91
- Bibcode:
- 1969MNRAS.145...91S