Opacity Tables

For historical reasons, stellar structure codes have been using the opacity tables from OPAL. However, after the first release of its opacities in 1995 [1] dedicated to stellar enveloppe conditions, The Opacity Project (OP) [2] pursued the work of atomic calculations and extended the different databases (TipTopbase). Finally the OP released in 2004 [3] the new set of monochromatic opacities available on the present site under Opacity Project (OPCD3.3). In order to simplify the work of stellar modelers, we now provided this set of tables fully compatible with the OPAL routine.


  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. Grevesse, N.; Sauval, A. J.; Space Science Reviews, v. 85, Issue 1/2, p. 161-174 (1998) Abstract
  4. Asplund, M.;, Grevesse, N. and Sauval, A. J.; Astronomical Society of the Pacific, 2005., p.25 Abstract GENERATE TYPE 1 TABLES

    In the following table, modify the Fractions related to each metal;
    Insert your e-mail adress and press on 'Compute' button.
    You will receive your results by e-mail.


        E-mail adress    




    C 0.246052
    N 0.061805
    O 0.502374
    Ne 0.089336
    Na 0.001589
    Mg 0.028251
    Al 0.002296
    Si 0.026979
    S 0.012047
    Ar 0.002008
    Ca 0.001764
    Cr 0.000429
    Mn 0.000252
    Fe 0.023498
    Ni 0.001321

    For more informations about this service or in case of troubleshooting please contact

    Frank Delahaye
    Carlo Maria Zwölf