Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..501s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 501-514.
Astronomy and Astrophysics
Astrophysics
69
Cepheid Variables, Cosmology, Magellanic Clouds, Star Clusters, Stellar Luminosity, Stellar Oscillations, Stellar Spectrophotometry, Distance, Open Clusters, Stellar Color, Stellar Magnitude, Stellar Mass, Ubv Spectra
Scientific paper
The period-luminosity color (PLC) relation for classical Cepheids is discussed in terms of a recent redetermination of the distance moduli of open clusters with Cepheid members. The distance moduli of eight clusters with well-established Cepheid members were determined from Stromgren four-color and H-beta photometry of the B stars. Possible sources of systematic errors in these distance moduli are discussed. Zero points are derived from these data for the PLC relation on the UBV system and the period-luminosity relations for near-infrared magnitudes. The present relations yield absolute magnitudes which are fainter by 0.4-0.6 mag than those now commonly used. These lower luminosities cause the pulsational masses of the Cepheids to be less than the evolutionary masses by up to a factor of 2.5 but bring them into good agreement with the masses of beat and bump Cepheids.
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