Opacities from the Opacity Project (Seaton+, 1995)

Details Opacities from the Opacity Project (Seaton+, 1995) Opacities from the Opacity Project (Seaton+, 1995)

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ycat.6080....0s&link_type=abstract

VizieR On-line Data Catalog: VI/80. Originally published in: 1994MNRAS.266..805S; 1994MNRAS.265L..25S; 1996MNRAS.279...95S

Physics

Atomic Physics

Atomic Physics, Models: Atmosphere

Scientific paper

1 CODES. ***** 1.1 Code rop.for ************ This code reads opacity files written in standard OP format. Its main purpose is to provide documentation on the contents of the files. This code, like the other codes provided, prompts for the name of the file (or files) to be read. The file names read in response to the prompt may have up to 128 characters. 1.2 Code opfit.for ************** This code reads opacity files in standard OP format, and provides for interpolation of opacities to any required values of temperature and mass-density. The method used is described in OPF. The code prompts for the name of a file giving all required control parameters. As an example, the file opfit.dat is provided (users will need to change directory names and file names). The use of opfit.for is illustrated using opfit.dat. Most users will probably want to adapt opfit.for for use as a subroutine in other codes. Timings for DEC 7000 ALPHA: 0.3 sec for data read and initialisations; then 0.0007 sec for each temperature-density point. Users who like OPAL formats should note that opfit.for has a facility to produce files of OP data in OPAL-type formats. 1.3 Code ixz.for ************ This code provides for interpolations to any required values of X and Z. See IXZ. It prompts for the name of a file giving all required control parameters. An example of such a file if provided, ixz.dat (the user will need to change directory and file names). The output files have names s92INT.'nnn'. The user specifies the first value of nnn, and the number of files to be produced. 2. DATA FILES ********** 2.1 Data files for solar metal-mix ****************************** Data for solar metal-mix s92 as defined in SYMP. These files are from version 2 runs of December 1994 (see IXZ for details on Version 2). There are 213 files with names s92.'nnn', 'nnn'=201 to 413. Each file occupies 83762 bytes. The file s92.version2 gives values of X (hydrogen mass-faction) and Z (metals mass-fraction) for each value of 'nnn'. The user can get s92.version2, select the values of 'nnn' required, then get the required files s92.'nnn'. The user can see the file in ftp, displayed on the screen, by typing "get s92.version2 -". The files s92.'nnn' can be used with opfit.for to obtain opacities for any requires value of temperature and mass density. Files for other metal-mixtures will be added in due course. Send requests to mjs@star.ucl.ac.uk. 2.2 Files for interpolation in X and Z ********************************** The data files have names s92xz.'mmm', where 'mmm'=001 to 096. They differ from the standard OP files (such as s92.'nnn' --- section 2.1 above) in that they contain information giving derivatives of opacities with respect to X and Z. Each file s92xz.'mmm' occupies 148241 bytes. The interpolations to any required values of X and Z are made using ixz.for. Timings: on DEC 7000 ALPHA, 2.16 sec for each new-mixture file. For interpolations to some specified values of X and Z, one requires just 4 files s92xz.'mmm'. Most users will not require the complete set of files s92xz.'mmm'. The file s92xz.index includes a table (starting on line 3) giving values, for each 'mmm' file, of x,y,z (abundances by number-factions) and X,Y,Z (abundances by mass-fractions). Users are advised to get the file s92.index, and select values of 'mmm' for files required, then get those files. The files produced by ixz.for are in standard OP format and can be used with opfit.for to obtain opacities for any required values of temperature and mass density. 3 RECOMMENDED PROCEDURE FOR USE OF OPACITY FILES ********************************************** (1) Get the file s92.version2. (2) If the values of X and Z you require are available in the files s92.'nnn' then get those files. (3) If not, get the file s92xz.index. (4) Select from s92xz.index the values of 'mmm' which cover the range of X and Z in which your are interested. Get those files and use ixz.for to generate files for your exact required values of X and Z. (5) Note that the exact abundance mixtures used are specified in each file (see rop.for). Also each run of opfit.for produces a table of abundances. (6) If you want a metal-mix different from that of s92, contact mjs@star.ucl.ac.uk. 4 FUTURE DEVELOPMENTS ******************* (1) Data for the calculation of radiative forces are provided as the CDS catalog (added August 1997) (2) Facilities will be added later which will enable the user to make calculations giving files for any required mixtures. (1 data file).

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