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.
See also
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, requires XSPEC 12.12.0 or later)
‘lpgs’, from 9 (proto-solar, requires XSPEC 12.12.0 or later)
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
- 1(1,2)
https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSabund.html Note that this may refer to a newer version than the compiled version used by Sherpa; use
get_xsversion
to check.- 2
Anders E. & Grevesse N. (1989, Geochimica et Cosmochimica Acta 53, 197) https://adsabs.harvard.edu/abs/1989GeCoA..53..197A
- 3
Asplund M., Grevesse N., Sauval A.J. & Scott P. (2009, ARAA, 47, 481) https://adsabs.harvard.edu/abs/2009ARA%26A..47..481A
- 4
Feldman U.(1992, Physica Scripta 46, 202) https://adsabs.harvard.edu/abs/1992PhyS…46..202F
- 5
Anders E. & Ebihara (1982, Geochimica et Cosmochimica Acta 46, 2363) https://adsabs.harvard.edu/abs/1982GeCoA..46.2363A
- 6
Grevesse, N. & Sauval, A.J. (1998, Space Science Reviews 85, 161) https://adsabs.harvard.edu/abs/1998SSRv…85..161G
- 7
Wilms, Allen & McCray (2000, ApJ 542, 914) https://adsabs.harvard.edu/abs/2000ApJ…542..914W
- 8
Lodders, K (2003, ApJ 591, 1220) https://adsabs.harvard.edu/abs/2003ApJ…591.1220L
- 9(1,2)
Lodders K., Palme H., Gail H.P., Landolt-Börnstein, New Series, vol VI/4B, pp 560–630 (2009) https://ui.adsabs.harvard.edu/abs/2009LanB…4B..712L/abstract
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