Recently a tight correlation between the bulge velocity dispersion and the galaxy circular velocity has been found for a sample of spiral galaxies (Ferrarese 2002). Since bulge velocity dispersion and circular velocity are related to the masses of the central black hole and dark matter halo respectively, the correlation between velocity dispersion

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