Gravity Assist and Scattering off AGB Stars off Molecular Clouds

AGB stars in the Magellanic Clouds

Regions of different metallicity have been identified in the Magellanic Clouds by using the ratio between Asymptotic Giant Branch stars of spectral type C and M. In the Large Magellanic Cloud the ratio appears to decrease radially while in the Small Magellanic Cloud (SMC) there is no clear trend, reflecting either the large extension of the SMC along the line of sight or a more complex star for...

Agb Stars in the Magellanic Clouds

Clouds On-off Klimate Intercomparison Experiment (cookie)

Cloud-radiative effects are expected to control many aspects of the current and future climates, ranging from the large-scale circulation of the atmosphere and intra-seasonal variability to climate sensitivity and precipitation projections. However, investigations so far have been carried out using individual models and various methodologies. To identify robust effects and facilitate physical u...

Post-AGB stars as testbeds of nucleosynthesis in AGB stars

We construct a data base of 125 post-AGB objects (including R CrB and extreme helium stars) with published photospheric parameters (effective temperature and gravity) and chemical composition. We estimate the masses of the postAGB stars by comparing their position in the (log Teff , log g) plane with theoretical evolutionary tracks of different masses. We construct various diagrams, with the ai...

Unexpected Spin-Off from Quantum Gravity

We propose a novel way of investigating the universal properties of spin systems by coupling them to an ensemble of causal dynamically triangulated lattices, instead of studying them on a fixed regular or random lattice. Somewhat surprisingly, graph-counting methods to extract highor low-temperature series expansions can be adapted to this case. For the two-dimensional Ising model, we present e...