set_xsabund

sherpa.astro.xspec.set_xsabund(abundance)[source] [edit on github]

Set the elemental abundances used by X-Spec models.

Set the abundance table used in the X-Spec plasma emission and photoelectric absorption models. It is equivalent to the X-Spec abund command [1].

Parameters:

abundance (str) – A file name, format described below, or one of the pre-defined names listed in the Notes section below.

Notes

The pre-defined abundance tables are:

  • ‘angr’, from [2]

  • ‘aspl’, from [3]

  • ‘feld’, from [4], except for elements not listed which are given ‘grsa’ abundances

  • ‘aneb’, from [5]

  • ‘grsa’, from [6]

  • ‘wilm’, from [7], except for elements not listed which are given zero abundance

  • ‘lodd’, from [8]

  • ‘lpgp’, from [9] (photospheric)

  • ‘lpgs’, from [9] (proto-solar)

The values for these tables are given at [1].

Data files should be in ASCII format, containing a single numeric (floating-point) column of the abundance values, relative to Hydrogen.

The screen output of this function is controlled by the X-Spec chatter setting (set_xschatter).

References

Examples

>>> set_xsabund('lodd')
 Solar Abundance Vector set to lodd:  Lodders, K. ApJ 591, 1220 (2003)
>>> set_xsabund('abund.dat')
 Solar Abundance Vector set to file:  User defined abundance vector / no description specified