We describe the impact that future lattice QCD calculations can have on the determination of the parameters of the standard model (quark masses, coupling constant, and particularly the CKM matrix elements) and the search for new physics beyond. We consider the impact of calculations requiring CPU resources ranging from what is possible by the end of 2007 (≈ 10 TFlop-yr with USQCD resources), th...

We apply the Levenberg-Marquardt minimization algorithm to seismic and classical observables of the αCen binary system in order to derive the fundamental parameters of αCenA+B, and to analyze the dependence of these parameters on the chosen observables, on their uncertainty, and on the physics used in stellar modelling. The seismological data are those by Bouchy & Carrier (2002) for αCen A, and...

We study the effect of microturbulence in the line formation calculations of H and He lines, in the parameter range typical for O and early B stars. We are specially interested in its effect on the determination of stellar parameters: Teff , log g and specially on the He abundance. We first analyze the behaviour of H and He model lines between 4 000 and 5 000 Å with microturbulence and find tha...

The study of detached eclipsing binaries is one of the most powerful ways to investigate the properties of individual stars and stellar systems. We present preliminary masses, radii and effective temperatures for the eclipsing binary WWAurigae, which is composed of two metallic-lined A-type stars. We also reanalyse the data on HD23642, an A-type eclipsing binary member of the Pleiades open clus...