Sodium synthesis and its abundance in yellow supergiants

Details Sodium synthesis and its abundance in yellow supergiants Sodium synthesis and its abundance in yellow supergiants

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pazh...14.1023d&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 14, Nov. 1988, p. 1023-1029. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

8

Main Sequence Stars, Nuclear Fusion, Sodium, Stellar Composition, Stellar Cores, Supergiant Stars, Hertzsprung-Russell Diagram, Interstellar Chemistry, Stellar Evolution, Stellar Mass

Scientific paper

In the convective cores of main-sequence stars, Ne-22 burns in the reaction Ne-22(rho, gamma)Na-23, leading to a significant increase in Na abundance. Calculations using the standard stellar evolution equations show that this reaction leads to a noticeable enhancement of atmospheric Na abundance at the first dredge-up phase. A simple expression is obtained which gives atmospheric sodium enrichment as a function of the star mass. It is found that the Na abundance in yellow supergiants increases with stellar mass. It is shown that calculations of the sodium enrichment in yellow supergiants agree with observational data, assuming that the initial Ne-22 content is three times larger than the standard solar value.

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