Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...208..480m&link_type=abstract
Astrophysical Journal, vol. 208, Sept. 1, 1976, pt. 1, p. 480-486. Research supported by the Alfred S. Sloan Foundation
Astronomy and Astrophysics
Astrophysics
34
Abundance, Hydrogen, Iron, Stellar Evolution, Correlation, Early Stars, Error Analysis, Late Stars, Ubv Spectra
Scientific paper
An apparent correlation between the ages and metallicities of field stars, reported in several surveys using ages based on isochrones in the H-R diagram and metallicities based on photometric line-blanketing indices, is shown to be dominated by systematic errors. The sources of error include the selection of biased samples, age-correlated errors arising from effects of the guillotine and surface gravity on ultraviolet excesses, and the small size of any evolutionary trend in metallicity as compared with plausible systematic errors in calibration of the indices. Moreover, random errors in photometry lead to systematic errors in age-abundance relations, to such an extent that the whole apparent 'evolutionary change' of metallicity, between the oldest and youngest disk stars, could arise from random photometric errors of not more than about 2 per cent.
McClure Robert D.
Tinsley Beatrice M.
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