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We have analyzed the long period, double-lined eclipsing binary system OGLESMC113.3 4007 (SC10 137844) in the SMC. The binary lies in the north-easternpart of the galaxy and consists of two evolved, well detached, non-active G8giants. The orbit is eccentric with e = 0.311 and the orbital period is 371.6days. Using extensive high-resolution spectroscopic and multi-color photometricdata we have determined a true distance modulus of the system of m-M=18.83 +/-0.02 (statistical) +/- 0.05 (systematic) mag using a surface brightness - colorrelation for giant stars. This method is very insensitive to metallicity andreddening corrections and depends only very little on stellar atmosphere modelassumptions. Additionally, we derived very accurate, at the level of 1%-2%,physical parameters of both giant stars, particularly their masses and radii,making our results important for comparison with stellar evolution models. Ouranalysis underlines the high potential of late-type, double-lined detachedbinary systems for accurate distance determinations to nearby galaxies.

The araucaria project. An accurate distance to the late-type double-lined eclipsing binary ogle smc113.3 4007 in the small magellanic cloud