Codes to compute mean opacities and radiative accelerations for arbitrary chemical mixtures using the Opacity Project recently revised data have been restructured in a client--server architecture and transcribed as a subroutine library. This implementation increases efficiency in stellar modelling where element stratification due to diffusion processes is depth dependent, and thus requires repeated fast opacity reestimates. Three user modes are provided to fit different computing environments, namely a web browser, a local workstation and a distributed grid.
@article{arxiv.0704.1583,
title = {OPserver: interactive online-computations of opacities and radiative accelerations},
author = {C. Mendoza and M. J. Seaton and P. Buerger and A. Bellorin and M. Melendez and J. Gonzalez and L. S. Rodriguez and F. Delahaye and E. Palacios and A. K. Pradhan and C. J. Zeippen},
journal= {arXiv preprint arXiv:0704.1583},
year = {2009}
}