OTELO (OSIRIS Tunable filter Emission Line Objects) is an emission-line object survey covering a spectral range between 9070 and 9280Å in a window of reduced airglow emission. The first pointing of OTELO, in the Extented Groth Strip, consists of 36 tomographic slices sampled at 6Å, obtained with the red tunable filter of OSIRIS at the Gran

The evolution of galaxies across the cosmic time are observationally studied by means of extragalactic surveys that cover significant volumes of Universe, with a wealth of multi-wavelength ancillary data. OTELO survey provides the deepest narrow band survey to date, in terms of minimum detectable flux, and emission line equivalent width, that has

The Planetary Nebulae Luminosity Function (PNLF) is an important standard candle on the extragalactic distance ladder. Its use is based on the empirical evidence that the [OIII]5007Å luminosity of PNe reaches a maximum value, M*, invariant with galaxy type and with a small dependence on metallicity. The PNLF method, applied to more than 50 galaxies

Most planetary nebulae (PNe) show beautiful, axisymmetric morphologies despite their progenitor stars being essentially spherical. Angular momentum provided by a close binary companion is widely invoked as the main agent that would help eject an axisymmetric nebula, after a brief phase of engulfment of the secondary within the envelope of the

The importance of long-period binaries for the formation and evolution of planetary nebulae is still rather poorly understood, which in part is due to the lack of central star systems that are known to comprise such long-period binaries. Here, we report on the latest results from the on-going Mercator-HERMES survey for variability in the central

Thick discs are nearly ubiquitous components of the discs of present-day galaxies. It has been proposed that a fraction of their stars have been accreted. Here, we aim to find whether accretion of satellites is the main formation mechanism of thick discs. To do so, we observed a sample of eight nearby edge-on galaxies with the Multi-Unit