The criteria for the spectral classification of the WN stars have been reviewed and some possibilities of their further refinement based on an additional small set of spectral line intensities have been analyzed. These refinements base on selected spectral lines of different ions of helium, nitrogen, carbon and oxygen, and probably of iron. The criteria are to be described in physical terms by due modelling of atmospheres of Wolf-Rayet stars.
Publications of the Tartu Astrofizica Observatory
- Pub Date:
- Spectral Classification:Wolf-Rayet Stars;
- Wolf-Rayet Stars:Spectral Classification