We report on an analysis of high resolution Chandra spectra of two stars with very similar spectral types and rotation rates but with very different evolutionary histories. AB Doradus is a young relatively bright (V=6.9) rapidly rotating (P=0.51d) late-type star (dK0-2) that is just evolving onto the main sequence. V471 Tau is a post-common

The regular pattern that high n p-mode frequencies of solar-like stars show is used to design a method for a quick check to the identification of the modes. The case of a wrong mode identification or a spurious one is clearly shown by the method, which depends rather weakly on the possible stellar models. An application of the method shows

NGC 6633 is a solar metallicity, young open cluster. In addition to providing useful information from an asteroseismic point of view, it has the additional attractiveness of being located in the potential field of view of the COROT space mission (indeed, it is currently included in the primary target selection list). We report on some preliminary

In this contribution, we study the different stellar configurations that can produce signals resembling those produced by a transiting planet. We list several strategies to recognize these false alarms. For the most common configurations, we delineate which of these strategies are able to detect them. The case of an eclipsing binary of similar

In the light of several recent developments we revisit the phenomenon of galactic stellar disk truncations. Even 25 years since the first paper on outer breaks in the radial light profiles of spiral galaxies, their origin is still unclear. The two most promising explanations are that these 'outer edges' either trace the maximum angular momentum

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