xsssa

Context: models

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]

XSPEC version

CIAO 4.18 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.

/ sherpa4.18 / ahelp / xsssa.html