LARGE MAGELLANIC CLOUD NEAR-INFRARED SYNOPTIC SURVEY. II. the WESENHEIT RELATIONS and THEIR APPLICATION to the DISTANCE SCALE

Anupam Bhardwaj, Shashi M. Kanbur, Lucas M. Macri, Harinder P. Singh, Chow Choong Ngeow, R. Wagner-Kaiser, Ata Sarajedini

研究成果: 雜誌貢獻回顧評介論文同行評審

48 引文 斯高帕斯(Scopus)

摘要

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 JHKs data to determine an independent distance to the LMC of μLMC = 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 WJ,H relations to determine the distance modulus of M31, μM31 = 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] < dex) to determine a global slope of -3.244 ± 0.016 mag dex-1 for the WJ,ks 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.

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文章編號88
期刊Astronomical Journal
151
發行號4
DOIs
出版狀態已出版 - 4月 2016

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