Recent cosmological N-body simulations suggest that current empirical estimates of tidal radii in dSphs might be underestimated by at least one order of magnitude. To constrain the plausibility of this theoretical framework, we undertook a multiband (U,B,V,I) survey of the Carina dSph. Deep B,V data of several fields located at radial distances

This proposal is a resubmission of an accepted RXTE AO 10 proposal. Our aim is to test evolutionary and type I burst models with the observed type I X-ray burst behaviour of the bright ultra-compact binary system 4U 1820-30. The short orbital period suggests that the companion white dwarf is hydrogen deficient, with evolutionary models predicting a

As a main example for the superstatistics approach, we study a Brownian particle moving in a d-dimensional inhomogeneous environment with macroscopic temperature fluctuations. We discuss the average occupation time of the particle in spatial cells with a given temperature. The Fokker-Planck equation for this problem becomes a stochastic partial

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Changes in the Earth s climate depend most basically on changes in the Sun s output the Earth s reflectance and greenhouse gasses Using SoHO helioseismic data a meaningful lower limit is found on solar irradiance that implies the historical Sun can t be dimmer than the present Sun Further the global earthshine photometric data from BBSO are used

SUNRISE is a balloon-borne solar telescope with an aperture of 1m working in the UV VIS optical domain The main scientific goal of SUNRISE is to study the structure and dynamics of the magnetic field in the atmosphere of the Sun at high spatial resolution SUNRISE will provide diffraction-limited images of the photosphere and chromosphere with an