The Opacity Project Tables Service
For historical reasons, stellar structure codes have been using the
opacity tables from OPAL. However, after the first release of its
opacities in 1995  dedicated to stellar envelope conditions, The
Opacity Project (OP)  pursued the work of atomic calculations and
extended the different databases (TipTopbase). Finally the OP released
in 2004  the new set of monochromatic opacities available on the
present site under Opacity Project (OPCD3.3). In order to simplify the
work of stellar modellers, we now provided this service to generate
opacity tables for any composition fully compatible with the OPAL
If you use the results from this service into a publication, please cite the article numbered 4 in the following reference list.
1 - The Opacity Project Team, 1995, The Opacity Project Vol. 1, Institute of Physics Publications, Bristol, UK
2 - Seaton M.J., 1987, J. Phys. B 20, 6363. Abstract
3 - Badnel et al., 2005, MNRAS, Volume 360, Issue 2, pp. 458-464. Abstract
4 - F. Delahaye, C.M. Zwölf, C.J. Zeippen, C. Mendoza; IPOPv2 online service for the generation of opacity tables; Journal of Quantitative Spectroscopy and Radiative Transfer, In press November 2015.
To generate an opacity tables in the type1 OPAL format, insert your e-mail address,
modify the Fractions related to each metal; and press on 'Compute' button. You will receive your results by e-mail.
You can also preview and download the existing results
or use our Standalone Client (for processing multiple compositions at once)