Opacity Project: OPserver  
Rosseland mean opacities (RMOs) and radiative accelerations (RAs) for arbitrary chemical mixtures are computed online directly from the Opacity Project (OP) monochromatic opacities. The mixture is specified by the hydrogen (X) and metal (Z) mass-fractions (X+Y+Z=1) and its metal fractional composition (default = S92 of [4]). For detailed documentation please check the reference list below. The OP opacities were refined in December 2004 to include inner-shell contributions [10], and the OPserver software upgraded in June 2006 to enable local installations and library linking. The complete OPCD_3.0 package (data, codes and instructions) to compute locally RMOs and RAs [11] and to install the OPserver can also be downloaded from the OP home page.

Please select an option:  
RMOs for a single chemical mixture  
RAs for a single chemical mixture  

  1. OPCD_2.0 reference manual
  2. Fitting and smoothing of opacity data
    Seaton M.J., 1993, MNRAS 265, L25. Abstract
  3. Opacities for stellar envelopes
    Seaton M.J., Yu Yan, Mihalas D., Pradhan A.K., 1994, MNRAS 266, 805. Abstract
  4. Interpolations of Rosseland-mean opacities for variable X and Z
    Seaton M.J., 1996, MNRAS 279, 95. Abstract
  5. Radiative accelerations in stellar envelopes
    Seaton M.J., 1997, MNRAS 289, 700. Abstract
  6. Diffusion of iron-group elements in the envelopes of HgMn stars
    Seaton M.J., 1999, MNRAS 307, 1008. Abstract
  7. On the importance of inner-shell transitions for opacity calculations
    Badnell N.R., Seaton M.J., 2003, J. Phys. B 36, 4367. Abstract
  8. A comparison of Rosseland-mean opacities from OP and OPAL
    Seaton M.J., Badnell, N.R., 2004, MNRAS 354, 457. Abstract
  9. Up-dated opacities from the Opacity Project
    Badnell N.R., Bautista M.A., Butler K., Delahaye F., Mendoza C., Palmeri P., Zeippen C.J., Seaton M.J., 2005, MNRAS 360, 458. Abstract
  10. OP data on CD for mean opacities and radiative accelerations
    Seaton M.J., 2005, MNRAS 362, L1. Abstract
Last modified: July 16, 2021

CNRS OSU Auburn cecalcula QUB Strathclyde LERMA-Obs. Paris
CFA-Harvard IVIC Univ. Mons Western Michigan Univ. Cambridge