  This work describes the analysis of 64 early-type, massive contact or
near-contact eclipsing systems from the Large Magellanic Cloud discovered by
the OGLE-III survey. It presents the determination of the
period-luminosity-colour relation followed by these objects, that is different
from the one previously known for late-type W UMa stars. The relation for
massive stars has a significantly steeper dependence on the colour, which is
related to a much higher bolometric correction, however it is shallower in the
period term. This leads to the conclusion, that the relation for the total
population of main sequence contact binaries is non-linear. When studied
separately, genuinely-contact and near-contact systems follow two slightly
different relations.

Solar and Stellar Astrophysics