Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306...25g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 1, 1986, p. 25-29. Research supported by the Universidad Nacional
Astronomy and Astrophysics
Astrophysics
15
Brightness Distribution, Cepheid Variables, Milky Way Galaxy, Periodic Variations, Scale (Ratio), Stellar Luminosity, Calibrating, Radial Velocity, Stellar Color, Stellar Magnitude, Ubv Spectra, Visual Observation
Scientific paper
Simultaneous BVRI photometric and radial velocity observations of some 30 galactic Cepheids are used to derive their luminosities by the surface brightness method of Barnes and Evans. From these data, a period-luminosity relation and a zero point of a period-luminosity-color relation are obtained. Absolute visual magnitudes about 0.1 mag brighter than those found by Schmidt from Stroemgren uvby-beta photometry, but some 0.3 mag fainter than those from older calibrations using ZAMS fitting are obtained, supporting recent evidence that Cepheid luminosities may have been overestimated in the past. The effect of a possible period dependence of the slope of the surface brightness-color relation is discussed, and it is shown that this would tend to make Cepheid absolute magnitudes fainter, yielding a P-L-C zero point in very good agreement with Schmidt's value.
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