Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..515d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, April 1984, p. 515-522.
Astronomy and Astrophysics
Astronomy
13
Astronomical Catalogs, Binary Stars, Dwarf Stars, G Stars, Late Stars, Main Sequence Stars, Stellar Evolution, Companion Stars, F Stars, Gas Density, Stellar Temperature, Visible Spectrum
Scientific paper
A sample of field F and G dwarfs of known ages is presented. All the dwarfs are secondaries of visual binaries in which the temperature and gravity of the hotter primary has been estimated from Stromgren photometry, and its age derived from reference to isochrones. This age is taken to apply to the secondary. Even in the case of F-type secondaries, which themselves have measured Stromgren indices, it is much better to estimate ages from the primaries as it is demonstrated that use of isochrones to determine age of stars not far evolved from the main sequence can lead to significant systematic overestimates of ages when the photometric measurements have typical random errors. A number of systems in which photometry is available for both components have primaries which appear much younger than the secondaries, suggesting a need for further investigation.
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