In 2005 a photometric observation campaign started on the open cluster χ Persei, involving 13 telescopes spread over the whole northern hemisphere. After two years we gathered almost 1200 hours of data. We present here preliminary results on the variability search, especially from the 60-cm telescope in Bialków (Poland), which show seven confirmed

We present PGos3, a database of evolutionary synthesis models and atmosphere libraries that compiles the Single Stellar Populations (SSP) results from different authors, covering more than 90% of the models used in the literature. PGos3 provides access to the models via WWW and in VOTable format accessible using TSAP protocol. Currently, a

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Context: The Groth field is one of the sky regions that will be targeted by the OTELO (OSIRIS Tunable Filter Emission Line Object) survey in the optical 820 nm and 920 nm atmospheric windows. A complementary broad-band photometric catalogue of the field is essential for several purposes, in particular the inequivocal identification of sources

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We present precise optical and near-infrared ground-based photometry of two globular clusters (GCs): ω Cen and 47 Tuc. These photometric catalogs are unbiased in the red giant branch (RGB) region close to the tip. We provide new estimates of the RGB tip (TRGB) magnitudes-mI(TRGB)=9.84+/-0.05, ω Cen; mI(TRGB)=9.46+/-0.06, 47 Tuc-and use these to