The age and helium content of the eclipsing binary AI Phoenicis

Details The age and helium content of the eclipsing binary AI Phoenicis The age and helium content of the eclipsing binary AI Phoenicis

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..270v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 270-279.

Astronomy and Astrophysics

Astrophysics

19

Abundance, Chronology, Eclipsing Binary Stars, Metallicity, Stellar Evolution, Helium

Scientific paper

Comparisons of new theoretical isochrones for heavy-element abundances Z = 0.0169 (solar) and Z = 0.04 with recently published parameters of AI Phoenicis suggest that this system has an age of approximately (3.6 + or - 0.7) x 10 to the 9th yr and a helium content of Y = 0.38 + or - 0.05. The indicated uncertainty is largely due to the lack of precise knowledge about the metallicity of the binary, since the fits to the data by both sets of isochrones are exceedingly good. The high helium content, which is required in order to reproduce the observed mass-luminosity relation, is suggested to be comparable with the values generally derived for binaries if the latter are adjusted to take into account the effects of the new Los Alamos opacities.

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