The Opacity Project
The Opacity Project (OP) 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 has involved research groups from France,
Germany, the United Kingdom, the United States and Venezuela. The state-
of-the-art atomic calculations were carried out in the close coupling
approximation using the R-matrix method. The OP team has published a
comprehensive description in the book "The Opacity Project" (Vol.1, Institute of
Physics Publishing, London UK, 1995), containing original papers and
an extensive set of oscillator strengths.
References:
- The Opacity Project Team, 1995, The Opacity Project, Vol. 1,
Institute Of Physics Publishing, Bristol, ISBN 0-7503-0288-7
- Seaton, M.J., Yu Yan, Mihalas, D., Pradhan, A.K., 1994,
MNRAS 266, 805 (SYMP)
TOPbase - Telnet and WWW Access
TOPbase is a read-only database system specially designed for general use of
the OP atomic data. It contains energy levels, f-values and photoionization
cross sections for astrophysically abundant elements.
TOPbase version has been specifically developed for
interactive use of the data, and allows the ftp of selected data files.
It contains data for ions with the following atomic and electron numbers:
- NZ=1-14; NZ=16; NZ=18; NZ=20; NZ=26
- NE=1-24 (where for any ion NE .LE. NZ)
****
TOPbase -- WWW interface at NASA GSFC (U.S. Site) ****
Telnet (heasarc.gsfc.nasa.gov/topbase) - login: topbase, password: Seaton+
Another link to TOPbase at CDS in Strasbourg, France is available via
Opacity Project .
return to Anil Pradhan's home page
Revised: 1995 Nov 7