Close visual binaries. II - Quantitative test of isochrones

Details Close visual binaries. II - Quantitative test of isochrones Close visual binaries. II - Quantitative test of isochrones

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..195c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 195-201.

Astronomy and Astrophysics

Astrophysics

8

Binary Stars, Hertzsprung-Russell Diagram, Main Sequence Stars, Visible Spectrum, Giant Stars, Loci, Stellar Color, Stellar Evolution, Stellar Magnitude, Stellar Mass, Stellar Models

Scientific paper

Homogeneous and accurate color-magnitude data are available from Paper I for each component of 56 close visual binaries, 30 with evolved components. The 21 binaries with main-sequence primaries are compared with new Yale isochrones to determine the appropriate isochrone composition: Y = 0.25, Z = 0.04. Explanations are given for eight binaries found to be inconsistent with this isochrone. Some of the remaining binaries suggest a decrease by 0.5 in the mixing length parameter for the reddest main-sequence stars, and either a smaller decrease or mass loss in the subgiant and giant phase of evolution. In general, the mean apparent age difference between binary components (0.0 + or - 0.1 Gyr) shows stellar evolution to be well modeled by the new Yale isochrones.

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