Sodium in Weak G-Band Giants
Abstract
Sodium abundances have been determined for eight weak G-band giants whose atmospheres are greatly enriched with products of the CN-cycling H-burning reactions. Systematic errors are minimized by comparing the weak G-band giants to a sample of similar but normal giants. If, further, Ca is selected as a reference element, model atmosphere-related errors should largely be removed. For the weak-G-band stars (Na/Ca) = 0.16 +/- 0.01, which is just possibly greater than the result (Na/Ca) = 0.10 /- 0.03 from the normal giants. This result demonstrates that the atmospheres of the weak G-band giants are not seriously contaminated with products of ON cycling.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1994
- DOI:
- 10.1086/174858
- Bibcode:
- 1994ApJ...435..797D
- Keywords:
-
- Astronomical Models;
- Calcium;
- Galactic Evolution;
- Giant Stars;
- Sodium;
- Stellar Radiation;
- Stellar Systems;
- Chemical Compounds;
- Stellar Atmospheres;
- Stellar Spectra;
- Astrophysics;
- STARS: ABUNDANCES;
- STARS: EVOLUTION;
- STARS: GIANTS