Abstract
ABSTRACT We present new near-infrared (NIR) Cepheid period–Wesenheit (P–W) relations in the LMC using time-series observations from the Large Magellanic Cloud NIR Synoptic Survey. We also derive optical+NIR P–W relations using V and I magnitudes from the Optical Gravitational Lensing Experiment. We employ our new JHK s data to determine an independent distance to the LMC of &mgr; LMC = 18.47 ± 0.07 ?> (statistical) 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 NIR period–luminosity and Wesenheit relations for Cepheids in M31 using observations from the Panchromatic Hubble Andromeda Treasury survey. We use the absolute calibrations of the Galactic and LMC W J , H ?> relations to determine the distance modulus of M31, &mgr; M31 = 24.46 ± 0.20 ?> mag. We apply a simultaneous fit to Cepheids in several Local Group galaxies covering a range of metallicities ( 7.7 < 12 + log [ O / H ] < 8.6 ?> dex) to determine a global slope of −3.244 ± 0.016 mag dex−1 for the W J , K s ?> 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 NIR P–W relations.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
