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During the OGLE-2 operation, Soszynski et al. (2003) found 3 LMC candidatesfor an RR Lyr-type component in an eclipsing binary system. Two of those haveorbital periods that are too short to be physically plausible and hence have tobe optical blends. For the third, OGLE052218.07-692827.4, we developed a modelof the binary that could host the observed RR Lyr star. After being grantedHST/WFPC2 time, however, we were able to resolve 5 distinct sources within a1.3" region that is typical of OGLE resolution, proving thatOGLE052218.07-692827.4 is also an optical blend. Moreover, the putativeeclipsing binary signature found in the OGLE data does not seem to correspondto a physically plausible system; the source is likely another background RRLyr star. There are still no RR Lyr stars discovered so far in an eclipsingbinary system.

In search of RR Lyrae type stars in eclipsing binary systems. OGLE052218.07-692827.4: an optical blend