Synopsis
The XSPEC ssa model: Strangeon star atmosphere.
Syntax
xsssa The xsssa model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xsssa", "mdl")
>>> print(mdl)Create a component of the xsssa model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.te thawed 0.1 0.01 0.5 mdl.y thawed 0.7 0.0001 1000 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| te | The electron temperature, in keV. |
| y | A combination of ion density, temperature, and stellar radius. See [1] for a description. The units are 10^42 keV/km/cm^6. |
| norm | This represents (R/d)^2, where d is the distance to the star in units of 10 kpc. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelSsa.html
XSPEC version
CIAO 4.17 comes with support for version 12.14.0k of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.14.0k
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.