Carbon and nitrogen abundance determinations from transition layer lines and mixing in stars
Abstract
For red giants a smooth increase in the nitrogen to carbon abundance ratio for increasing B-V as is expected for the first dredge up phase when the outer convection zone deepens is found. An average increase in the nitrogen to silicon ratio for B-V = 0.6 which goes back to almost solar values for cool giants with B - V approximately 1.0 is reported. It looks as if Si would be enriched for deeper mixing contrary to expectations from standard evolution theory.
- Publication:
-
ESA Special Publication
- Pub Date:
- June 1988
- Bibcode:
- 1988ESASP.281a.381B
- Keywords:
-
- Abundance;
- Giant Stars;
- Iue;
- Spaceborne Astronomy;
- Ultraviolet Astronomy;
- Ultraviolet Spectra;
- Stellar Composition;
- Stellar Evolution;
- Astronomy