Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..49..113c&link_type=abstract
Astrophysics and Space Science, vol. 49, no. 1, June 1977, p. 113-122.
Astronomy and Astrophysics
Astrophysics
1
Chemical Composition, Main Sequence Stars, Stellar Luminosity, Stellar Mass, Stellar Models, Abundance, Bolometers, Electrophotometers, Pleiades Cluster, Stellar Spectrophotometry
Scientific paper
A homogeneous sample of zero-age main-sequence stellar models is analyzed, and empirical relations are derived which express bolometric magnitudes as a function of chemical composition. An empirical relation is also obtained which gives luminosity as a function of mass for different assumed chemical compositions. Observed and theoretical zero-age lines are compared on the basis of these relations, chemical-composition parameters (Y and Z) are determined for Pleiades stars, and the behavior of main-sequence field stars with known parallaxes and metal-abundance parameters is examined. Application of the relations to main-sequence Hyades members yields ambiguous results which may indicate a helium content that increases with metal abundance.
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