An Adjustment to the Cepheid Period-Luminosity Zero Point Derived Using Synthetic Colors

Details An Adjustment to the Cepheid Period-Luminosity Zero Point Derived Using Synthetic Colors An Adjustment to the Cepheid Period-Luminosity Zero Point Derived Using Synthetic Colors

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.5901h&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #59.01; Bulletin of the American Astronomical Society, Vol. 24, p.823

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Hindsley and Bell (1989, Ap. J., 341, 1004) recently published a period-luminosity relation for Cepheid variables using the Barnes-Evans method, with the relationship between the Johnson system color V-R and the surface brightness calculated using synthetic colors derived from synthetic spectra. This period-luminosity relationship had a zero point 0.2 - 0.5 mag brighter than zero points derived by other methods. We have compared colors derived from the spectrum scans of Gunn & Stryker (1983, Ap.J.Suppl., 52, 121) and the sensitivity functions used in our color calculations to the cor- responding observed colors. This comparison shows that it is necessary to transform the colors calculated from the fluxes for them to fit the observations. This transformation makes the computed colors on the Cousins system redder by up to 0.05 mag. When this transformation is applied to the synthetic colors, it yields a period-luminosity zero point fainter by 0.17 magnitudes, consistent with the brightest published results from other methods.

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