Context. Studies of the mass function (MF) of open clusters of different ages allow us to probe the efficiency with which brown dwarfs evaporate from clusters to populate the field. Surveys of older clusters (age ≳ 100 Myr) are not affected so severely by several problems encountered in young clusters, such as intra-cluster extinction and large

Studies of the mass function of open clusters of different ages allow us to study the efficiency with which brown dwarfs are evaporated from clusters to populate the field. Surveys in relatively old clusters (age ≳100 Myr) do not suffer from problems found in young clusters, such as intra-cluster extinction and large uncertainties in brown dwarf

We present new results of a long-term investigation of the stellar content of the Large and the Small Magellanic Cloud. The main aim of the project is to obtain a comprehensive knowledge of the star formation history of these two nearby galaxies. Here we discuss the latest findings obtained using new data and a variety of different observational

Not Available

In this work, based on Integral Field Unit spectroscopy observations on the Gemini South telescope, we study the spatial distribution of the He II λ4686 emission line and its relationship with the properties of the interstellar medium in two compact H II galaxies (Tol 0104-388 and Tol 2146-391). We explore the possible mechanisms responsible for

The NIR Ca II triplet has proven to be an important tool for quantitative spectroscopy. Here we present results of synthetic spectral analysis for the Ca II triplet for low-metallicity red giant stars, combined with observational data. Our results start to deviate strongly from the widely-used and linear empirical calibrations below [Fe/H] = -2. We