Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..635c&link_type=abstract
Astrophysical Journal, Part 1, vol. 221, Apr. 15, 1978, p. 635-644.
Astronomy and Astrophysics
Astrophysics
52
Cepheid Variables, Radii, Stellar Structure, Stellar Temperature, Brightness, Colorimetry, Distance, Radial Velocity, Stellar Evolution, Stellar Luminosity, Stellar Mass
Scientific paper
Radius and temperature determinations of classical Cepheids have been assembled from the literature and plotted along with theoretical relationships in (log P, log R)- and (log P, log Te)-diagrams. Different methods of radius determination give significantly different results. At shorter periods, the slope in the (log P, log R)-diagram is probably either 0.7 or 1.0. Arguments are presented for both interpretations, but the former value seems the more likely. In either case there are probably substantial systematic errors in many Wesselink determinations. From the temperatures it is seen that, for periods less than 12 days, the observed and theoretical blue edges agree quite well, but for longer periods the observed blue edge is cooler and has a steeper slope. This discrepancy, also observed in the Small Magellanic Cloud, cannot be removed by using any of the alternative temperature calibrations in the literature. Beat Cepheids are not confined to either the red or the blue edge of the instability strip.
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