Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..561s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, June 1986, p. 561-571.
Astronomy and Astrophysics
Astronomy
44
Sodium, Stellar Composition, Stellar Evolution, Stellar Mass, Supergiant Stars, Abundance, Hertzsprung-Russell Diagram, Novae, Thermodynamic Equilibrium
Scientific paper
Considering the possibility for a low-mass celestial body to attain high luminosity, characteristic for a normal supergiant, and mimic spectroscopic and photometric behavior of the latter, a method is proposed that could be possibly used to distinguish between supergiants and their limitations. In this method, surface abundance of Na-23 was used as a probable mass indicator, deriving the sodium-to-mass relation for a sample of 34 well-observed stars. Special attention was paid to the parameter-related errors and non-LTE effects for the Na I lines in the visible. To account for the initial sodium content, all sodium abundances were normalized, using the Na/Fe relation derived from solar-type dwarfs. The plot of the normalized sodium abundance against stellar mass has revealed a direct relationship between the two parameters, suggesting a real interdependence. The classical Cepheid X Cyg, believed to be a true intermediate-mass star, was well within the highly scattered relation.
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