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arXiv · 1311.2340

The Araucaria Project. The distance to the Small Magellanic Cloud from late-type eclipsing binaries

Dariusz Graczyk·Grzegorz Pietrzynski·Ian B. Thompson·Wolfgang Gieren·Bogumił Pilecki·Piotr Konorski·Andrzej Udalski·Igor Soszynski·Sandro Villanova·Marek Górski·Ksenia Suchomska·Paulina Karczmarek·Rolf-Peter Kudritzki·Fabio Bresolin·Alexandre Gallenne
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Abstract

We present a distance determination to the Small Magellanic Cloud (SMC) based on an analysis of four detached, long period, late type eclipsing binaries discovered by the OGLE Survey. The components of the binaries show negligible intrinsic variability. A consistent set of stellar parameters was derived with low statistical and systematic uncertainty. The absolute dimensions of the stars are calculated with a precision of better than 3%. The surface brightness - infrared color relation was used to derive the distance to each binary. The four systems clump around a distance modulus of (m - M)=18.99 with a dispersion of only 0.05 mag. Combining these results with the distance published by Graczyk et al. for the eclipsing binary OGLE SMC113.3 4007 we obtain a mean distance modulus to the SMC of 18.965 +/- 0.025 (stat.) +/- 0.048 (syst.) mag. This corresponds to a distance of 62.1 +/- 1.9 kpc, where the error includes both uncertainties. Taking into account other recent published determinations of the SMC distance we calculated the distance modulus difference between the SMC and the LMC equal to 0.458 +/- 0.068 mag. Finally we advocate mu_{SMC}=18.95 +/- 0.07 as a new "canonical" value of the distance modulus to this galaxy.

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Dariusz Graczyk, Grzegorz Pietrzynski, Ian B. Thompson, Wolfgang Gieren, Bogumił Pilecki, Piotr Konorski, Andrzej Udalski, Igor Soszynski, Sandro Villanova, Marek Górski, Ksenia Suchomska, Paulina Karczmarek, Rolf-Peter Kudritzki, Fabio Bresolin, Alexandre Gallenne. 2013-11-11. The Araucaria Project. The distance to the Small Magellanic Cloud from late-type eclipsing binaries. https://doi.org/10.1088/0004-637x%2F780%2F1%2F59

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