Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.184..825s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 184, Sept. 1978, p. 825-834. Research supported by the Australian Resea
Astronomy and Astrophysics
Astronomy
13
Stellar Evolution, Stellar Luminosity, Stellar Spectrophotometry, Variable Stars, Color, Star Distribution, Stellar Magnitude, Ubv Spectra
Scientific paper
It is found from accurate beta photometry of bright stars in the region of the Beta CMa instability strip that about three-quarters of the stars in the strip, to a distance modulus of 8.0, are Beta CMa variables. The strip is not resolved by the data, so that its intrinsic width is uncertain, but the conclusion from a consideration of theoretical evolutionary rates is that the variables must be very near the end of core hydrogen burning. Comparison of the relative positions of the empirical and theoretical instability strip and zero-age main sequence indicates that the observationally located upper ZAMS is too bright.
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