We explore the dependence of {T_eff}'s and colors of stellar models on the treatment of over-adiabatic convection, both in the atmosphere and in the interior. We compute main sequence, turnoff, and subgiant models for low metallicity stars (Z=2 10-4) using as boundary conditions two new sets of model atmospheres by the Wien group (Kupka \cite{kup96

We present the results of a series of Chandra observations of globular cluster (GC) X-ray sources in M31. Among some 20 GC X-ray sources detected in our M31 observations, 2-3 of them show super-Eddington luminosity (> 1038 erg s-1). It is an interesting fact that the highest X-ray luminosities achieved by Galactic GCs are only several times 1037

The Chandra Multiwavelength Plane (ChaMPlane) Survey is a project to identify a large sample of serendipitous X-ray sources in the galactic plane (|b| ~ 10o), including cataclysmic variables, quiescent low mass X-ray binaries (qLMXBs: including both black hole and neutron star systems), Be X-ray binaries and stellar coronal sources (see Grindlay

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It is presently widely accepted that the solar low l p modes show asymmetric profiles when their power spectrum is analysed and that the fact of fitting symmetric profiles yields systematic effects in the obtained frequencies which could affect the results of inversions. In this paper the low l p-mode profiles are analysed using wavelets to denoise

The Chandra discovery of an X-ray bright jet in the "first light" distant quasar PKS 0637-752 showed that the X-rays can be energetically dominant even at large distances from the core, and sparked renewed interest in jet physical properties. We recently suggested that the high X-ray luminosities of the jets of PKS 0637-752 and the well-known