paper

Large Magellanic Cloud Near-Infrared Synoptic Survey. II. The Wesenheit relations and their application to the Distance scale

arXiv:1510.03682 · doi:10.3847/0004-6256/151/4/88

Abstract

We present new near-infrared Cepheid Period-Wesenheit relations in the LMC using time-series observations from the Large Magellanic Cloud Near-Infrared Synoptic Survey. We also derive opticalnear-infrared P-W relations using and ~magnitudes from OGLE-III. We employ our new data to determine an independent distance to the LMC of ~mag, using an absolute calibration of the Galactic relations based on several distance determination methods and accounting for the intrinsic scatter of each technique. We also derive new near-infrared Period-Luminosity and Wesenheit relations for Cepheids in M31 using observations from the PHAT survey. We use the absolute calibrations of the Galactic and LMC relations to determine the distance modulus of M31, ~mag. We apply a simultaneous fit to Cepheids in several Local Group galaxies covering a range of metallicities (~dex) to determine a global slope of -~mag/dex for the relation and obtain robust distance estimates. Our distances are in good agreement with recent TRGB based distance estimates and we do not find any evidence for a metallicity dependence in the near-infrared P-W relations.

16 pages, 8 figures, Accepted for publication in The Astronomical Journal

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