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Progress in understanding the formation and evolution of planetary nebulae(PN) has been restricted by a paucity of well-determined central star masses.  To address this deficiency we aim to (i) significantly increase the number ofknown eclipsing binary central stars of PN (CSPN), and subsequently (ii)directly obtain their masses and absolute dimensions by combining theirlight-curve parameters with planned radial velocity data.  Using photometric data from the third phase of the Optical GravitationalLensing Experiment (OGLE) we have searched for periodic variability in a largesample of PN towards the Galactic Bulge using Fourier and phase-dispersionminimisation techniques.  Among some dozen periodically variable CSPN found, we report here on threenew eclipsing binaries: M 3-16, H 2-29 and M 2-19.  We present images, confirmatory spectroscopy and light-curves of the systems.

Discovery of Eclipsing Binary Central Stars in the Planetary Nebulae M 3-16, H 2-29 and M 2-19