We derive the conditions under which the profile of a weak Fraunhofer line can be described as the convolution of the separate profiles of damping, thermal and non-thermal motions at the average depth of formation of the line. The average velocity distribution along the line of sight, rather than it
The influence of a photospheric spectrum of turbulence on the profiles of weak Fraunhofer lines
โ Scribed by Cornelis Jager
- Publisher
- Springer
- Year
- 1974
- Tongue
- English
- Weight
- 504 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
Divergence between determinations of the iron abundance from permitted Fe lines and forbidden FeII lines is discussed and a re-examination of the equivalent widths of two of the [Fen] lines is proposed.
On scans obtained with the Oxford photoelectric spectrometer, the [CalI] transition 4s 2S1/2-3d 2Da/~ is identified with a weak Fraunhofer line. It is argued that the strength of the line is consistent with the abundance of calcium which is derived from the permitted lines of CaI and Can.
The asymmetric profiles of 11 metallic lines are studied, at ~ = 0.3, as functions of ~. Their variations cannot be interpreted as due to temperature effects, but might imply a dependence on q~ of the photospheric velocity field. In a previous paper (Caccin et at., 1976) we analyzed the behaviour o