A Test for the Metallicity Dependence of the Cepheid Period-Luminosity Relation in the Near Infrared and a New Distance to M31

Details A Test for the Metallicity Dependence of the Cepheid Period-Luminosity Relation in the Near Infrared and a New Distance to M31 A Test for the Metallicity Dependence of the Cepheid Period-Luminosity Relation in the Near Infrared and a New Distance to M31

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.9611w&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #96.11; Bulletin of the American Astronomical Society, Vol. 28, p.1400

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new JHK' photometry for previously discovered M31 Cepheids within the Baade and Swope fields I, III, and IV. The data were obtained over 6 nights in August 1993 and 3 nights in October 1994 using the RedeyeN camera of CFHT in conditions of FWHM=0.65 arcsec seeing. The Cepheids were chosen to be a subset of those observed by Freedman & Madore (1990). Some of the Cepheids in this subset were resolved into multiple objects. The correct stars were identified by variation (when multiple-epoch observations were available), and by their position on the JHK' color-color plane. The total absorption at K' is a factor of 4 lower than that for I, the longest wavelength in the previous study. We present an improved true distance modulus estimate for M31 and an investigation of the dependence of the Cepheid infrared P-L relation on metal abundance. Theoretical predictions and empirical studies of the latter have been contradictory in the past a nd the systematic errors affecting the calibration are expected to be much smaller in the infrared.

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