On the distance of the Magellanic Clouds using Cepheid NIR and optical-NIR Period Wesenheit Relations

Abstract

We present the largest near-infrared (NIR) data sets, $JHKs$, ever collected for classical Cepheids in the Magellanic Clouds (MCs). We selected fundamental (FU) and first overtone (FO) pulsators, and found 4150 (2571 FU, 1579 FO) Cepheids for Small Magellanic Cloud (SMC) and 3042 (1840 FU, 1202 FO) for Large Magellanic Cloud (LMC). Current sample is 2--3 times larger than any sample used in previous investigations with NIR photometry. We also discuss optical $VI$ photometry from OGLE-III. NIR and optical--NIR Period-Wesenheit (PW) relations are linear over the entire period range ($0.0<\log P_{\mathrm{FU}}\le 1.65$) and their slopes are, within the intrinsic dispersions, common between the MCs. These are consistent with recent results from pulsation models and observations suggesting that the PW relations are minimally affected by the metal content. The new FU and FO PW relations were calibrated using a sample of Galactic Cepheids with distances based on trigonometric parallaxes and Cepheid pulsation models. By using FU Cepheids we found a true distance moduli of $18.45\pm 0.02(\mathrm{random})\pm 0.10(\mathrm{systematic})$ mag (LMC) and $18.93\pm 0.02(\mathrm{random})\pm 0.10(\mathrm{systematic})$ mag (SMC). These estimates are the weighted mean over ten PW relations and the systematic errors account for uncertainties in the zero-point and in the reddening law. We found similar distances using FO Cepheids ($18.60\pm 0.03(\mathrm{random})\pm 0.10(\mathrm{systematic})$ mag [LMC] and $19.12\pm 0.03(\mathrm{random})\pm 0.10(\mathrm{systematic})$ mag [SMC]). These new MC distances lead to the relative distance, $\Delta \mu =0.48\pm 0.03$ mag (FU, $\log P=1$) and $\Delta \mu =0.52\pm 0.03$ mag (FO, $\log P=0.5$),which agrees quite well with previous estimates based on robust distance indicators.

arXiv comment17 pages, 7 figures

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