Sodium in weak G-band giants

Details Sodium in weak G-band giants Sodium in weak G-band giants

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435..797d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 435, no. 2, p. 797-804

Astronomy and Astrophysics

Astrophysics

5

Astronomical Models, Calcium, Galactic Evolution, Giant Stars, Sodium, Stellar Radiation, Stellar Systems, Chemical Compounds, Stellar Atmospheres, Stellar Spectra

Scientific paper

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.

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