Observational studies of Cepheids. VI - Period-radius relations

Details Observational studies of Cepheids. VI - Period-radius relations Observational studies of Cepheids. VI - Period-radius relations

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..280m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. 280-287.

Statistics

Computation

30

Cepheid Variables, Radii, Stellar Luminosity, Stellar Oscillations, Stellar Spectrophotometry, Computational Astrophysics, Star Clusters, Stellar Temperature

Scientific paper

Using the visual surface brightness technique, the radii of 63 classical Cepheids covering a period range of three to 45 days have been determined. The resulting period-radius relation is in reasonable agreement with the theoretical period-radius relation for Cepheids. After reviewing all of the modern Baade-Wesselink type solutions, it is found that they bracket the theoretical period-radius relation. These results cast doubt on the validity of the beat/bump period-radius relation and suggest that the distance and/or temperature scales for classical Cepheids may need adjustment. A reliable period-radius relation is still not at hand, but improvements have been made which appear to be converging toward a confident relation.

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