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The only well-studied red nova progenitor (V1309 Sco) was a contact binarywith a 1.4-day period. The prospects for searching for similar systems, as wellas stellar merger candidates in general, are explored in this work. Thephotospheric temperatures of 128 variables with periods P = 1.1 - 1.8 dclassified as W UMa-type binaries are calculated using their colors listed inthe SDSS catalog. A selection of 15 contact binaries with similar temperaturesand periods as the V1309 Sco progenitor is thus compiled. The Kepler EclipsingBinary Catalog is used to analyse systems with eclipse timing variations (ETV)possibly caused by changes of the orbital period. Out of the 31 systems withparabolic ETV curves listed by Conroy et al. (2014, AJ, 147, 45) two could becontact binaries with a decreasing period and, therefore, potential stellarmerger candidates. Out of the 569 contact binaries in the OGLE field analysedby Kubiak et al. (2006, AcA, 56, 253) 14 systems have periods longer than 0.8 dand a statistically significant period decrease.

Searching for twins of the V1309 Sco progenitor system: a selection of long-period contact binaries