abund



next up previous contents
Next: addcomp Up: XSPEC commands Previous: Description of Syntax

abund

Set the Solar abundance table used in the plasma emission and photoelectric absorption models.
XSPEC> abund <option>
where <option> is either `angr`, from Anders E. & Grevesse N. (1989, Geochimica et Cosmochimica Acta 53, 197), or `feld`, from Feldman U. (1992, Physica Scripta 46, 202). The tables are :

            Element          angr           feld
               H            1.00e+0        1.00e+0
               He           9.77e-2        9.77e-2
               C            3.63e-4        3.98e-4
               N            1.12e-4        1.00e-4
               O            8.51e-4        8.51e-4
               Ne           1.23e-4        1.29e-4
               Na           2.14e-6        2.14e-6
               Mg           3.80e-5        3.80e-5
               Al           2.95e-6        2.95e-6
               Si           3.55e-5        3.55e-5
               S            1.62e-5        1.62e-5
               Cl           1.88e-7        1.88e-7
               Ar           3.63e-6        4.47e-6
               Ca           2.29e-6        2.29e-6
               Cr           4.84e-7        4.84e-7
               Fe           4.68e-5        3.24e-5
               Ni           1.78e-6        1.78e-6
               Co           8.60e-8        8.60e-8



Keith Arnaud (kaa@genji.gsfc.nasa.gov)
Mon Sep 18 14:36:38 EDT 1995