We present a determination of precise fundamental physical parameters of twenty detached , double-lined , eclipsing binary stars in the Large Magellanic Cloud ( LMC ) containing G- or early K-type giant stars .
Eleven are new systems , the remaining nine are systems already analyzed by our team for which we present updated parameters .
The catalogue results from our long-term survey of eclipsing binaries in the Magellanic Clouds suitable for high-precision determination of distances ( the Araucaria project ) .
The V-band brightnesses of the systems range from 15.4 mag to 17.7 mag and their orbital periods range from 49 days to 773 days .
Six systems have favorable geometry showing total eclipses .
The absolute dimensions of all eclipsing binary components are calculated with a precision of better than 3 % and all systems are suitable for a precise distance determination .
The measured stellar masses are in the range 1.4 to 4.6 M _ { \odot } and comparison with the MESA isochrones gives ages between 0.1 and 2.1 Gyr .
The systems show an age-metallicity relation with no evolution of metallicity for systems older than 0.6 Gy , followed by a rise to a metallicity maximum at age 0.5 Gy , and then a slow metallicity decrease until 0.1 Gy .
Two systems have components with very different masses : OGLE LMC-ECL-05430 and OGLE LMC-ECL-18365 .
Neither system can be fitted by single stellar evolution isochrone , explained by a past mass transfer scenario in the case of ECL-18365 and a gravitational capture or a hierarchical binary merger scenario in the case of ECL-05430 .
The longest period system OGLE LMC SC9_230659 shows a surprising apsidal motion which shifts the apparent position of the eclipses .
This is a clear sign of a physical companion to the system , however neither investigation of the spectra nor light curve analysis indicate a third light contribution larger than 2-3 % .
In one spectrum of OGLE LMC-ECL-12669 we noted a peculiar dimming of one of the components by 65 % well outside of the eclipses .
We interpret this observation as arising from an extremely rare occultation event as a foreground Galactic object covers only one component of an extragalactic eclipsing binary .