Helium content of the population II binary system CM Draconis

Details Helium content of the population II binary system CM Draconis Helium content of the population II binary system CM Draconis

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286..332p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 1, 1984, p. 332-336.

Astronomy and Astrophysics

Astrophysics

16

Eclipsing Binary Stars, Helium, Stellar Composition, Stellar Models, Abundance, Adiabatic Conditions, Polytropic Processes, Stellar Mass

Scientific paper

A method is proposed for determining stellar helium abundances on the basis of fully convective stellar models with known radii, masses and luminosities. The effectiveness of the method is evaluated using observational data for the population II binary system CM Draconis. It is shown that the derived helium content depends only weakly on the age of the star and the adapted heavy-element content. In a comparison of values for the adiabatic constant K-P rho exp. (-5/3) obtained from theoretical models of the outer layers of the atmosphere and from the observed masses and radii of CM Draconis helium abundances were estimated (in mass fraction) to be 0.25 (+ or - 0.14) and 0.38 (+ or - 0.12) for components A and B, respectively. The main contribution of the errors in the study was due to uncertainty in radial velocity amplitudes.

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