We want to study the characteristics and the physical extent of the old populations in a sample of Local Group galaxies in different environments, from the dSph satellites in the halo of M31 to the isolated dIrr galaxies and to the haloes of M31 and M33 themselves. For this purpose, we plan to adopt RR Lyraes as stellar tracers. We need to obtain a

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We evaluate the transit detection capabilities of the STARE experiment in a real observing run. To this end, artificial transits have been added to 480 light curves of stars from STARE data, varying their amplitudes, periods and phases. A matched filter algorithm was then applied for the transit search. Detection probabilities of over 60% can be

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The [OII]3727 emission line is frequently used as an indicator of the star formation rate (SFR) despite its complex dependence on metallicity and excitation conditions. We have analysed the properties of the [OII] and Halpha emission lines for a complete sample of local Halpha-selected galaxies, the Universidad Complutense de Madrid (UCM) survey

Selected photometric bands, spatial resolution, disk dimension in the frame and the scanned sky background level are determined in order to establish galactic structural parameters. A crude analysis could lead to erroneous results. Possible causes of error, as well as the minimum requirements for a precise determination of parameters, will be