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The Opacity Project
The name Opacity Project (OP) [1] refers to an international collaboration
that was formed in 1984 to calculate the extensive atomic data
required to estimate
stellar envelope opacities and to compute Rosseland mean opacities
and other related quantities.
It involved research groups from France,
Germany, the United Kingdom, the United States and Venezuela. The approach
adopted by the OP to calculate opacities is based on a new formalism of the
equation of state [2]
and on the computation by ab initio methods of accurate atomic
properties such
as energy levels, f-values and photoionization cross sections [3]. The OP
final results are discussed by Seaton et al. [4].
OP opacities have been recently revised to include inner-shell contributions
[5]. The new data and a suite of easy-to-use codes to compute Rosseland
means and radiative accelerations [6] can be downloaded as a tar file
below.
- OPCD_3.3:
Tar file (669 MB) to be downloaded with complete package (data, codes
and instructions) for computing Rosseland mean opacities and radiative
accelerations. Data files are the same as OPCD_2.0, but new software
is includedf to install OPserver at the user's facilities (12-12-06).
- OPCD_3.3_opserver:
Small tar file with the new software to install OPserver locally. Since
the bulky OP data with monochromatic opacities is not included, only
the OPserver that accesses data remotely from the Ohio Supercomputer
Center will be operational (12-12-06).
- OPserver:
An interactive server at the Ohio Supercomputing Center for
online computing of opacities for arbitrary chemical mixtures. Codes
have been updated with the release of OPCD_3.3 (12-12-06).
- TOPbase:
online interactive database listing LS atomic data (energy levels, f-values
and photoionisation cross sections) computed in the OP.
- OP
Team
- Complete
list of publications
- OPCD_2.1:
Tar file (667 Mb) to be downloaded with complete package (data, codes
and instructions) for computing Rosseland mean opacities and radiative
accelerations Data files are the same as OPCD_2.0, but new codes are
included and some have been updated (01-03-05).
- OPCD_update_2.1:
Small tar file to be downloaded with new codes to upgrade OPCD_2.0 to
OPCD_2.1 (01-03-05).
- OPCD_2.0:
Tar file (667 Mb) to be downloaded with complete package (data, codes
and instructions) for computing Rosseland mean opacities and radiative
accelerations (01-12-04).
References
- The Opacity Project Team, 1995, The Opacity Project Vol. 1, Institute of
Physics Publications, Bristol, UK
- Hummer D.G., Mihalas D., 1988, ApJ 331, 794.
Abstract
- Seaton M.J., 1987, J. Phys. B 20, 6363.
Abstract
- Seaton M.J., Yu Yan, Mihalas D., Pradhan A.K., 1994, MNRAS 266, 805.
Abstract
- Badnell N.R., Bautista M.A., Butler K., Delahaye F., Mendoza C., Palmeri P.,
Zeippen C.J., Seaton M.J., 2004, MNRAS, in press (astro-ph/10744).
- Seaton M.J., 2004, MNRAS, in press (astro-ph/11010).
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