On the asymmetry of selected Fraunhofer lines. III.
Abstract
The asymmetry of 10 Fraunhofer lines observed with a horizontal solar telescope and a double-diffraction monochromator is examined as a function of equivalent width and lower-level excitation potential. The lines, all produced by neutral species, span the spectral range from 5811.919 to 7807.916 A. During processing of the observational data, the line profiles were smoothed both before and after being corrected for instrument-contour error. It is found that the asymmetry is 'positive' for all lines except the oxygen IR triplet at 7771.954, 7774.177, and 7775.395 A. The results also show that the asymmetry does not depend on excitation potential and decreases as the equivalent width increases. Possible reasons for the last two findings are considered.
- Publication:
-
Astrometriia i Astrofizika
- Pub Date:
- 1976
- Bibcode:
- 1976AAfz...29...89K
- Keywords:
-
- Fraunhofer Lines;
- Solar Instruments;
- Telescopes;
- Asymmetry;
- Data Smoothing;
- Oxygen Spectra;
- Spectral Line Width;
- Solar Physics