Performs the XSPEC command abund.
sherpa> XSPEC ABUNDAN {<arg> | FILE <filename>}
where <arg> is one of the options listed in the table below.
This commands sets the elemental abundance table used in
XSPEC plasma-code models. (It does not set abundances
for xswabs.)
Allowed Arguments
| angr | default value; Anders E. &
Grevesse N. (1989, Geochimica et Cosmochimica Acta 53, 197) |
| feld | Feldman U. (1992, Physica
Scripta 46, 202) |
| aneb | Anders E. & Ebihara (1982,
Geochimica et Cosmochimica Acta 46, 2363) |
| grsa | Grevesse, N. & Sauval,
A.J. (1998, Space Science Reviews 85, 161) |
| wilm | Wilms, Allen & McCray
(2000, ApJ 542, 914) |
| lodd | The solar photospheric abundances in Lodders, K (2003, ApJ 591, 1220) |
| file <filename> |
<filename> is an ASCII file containing 30 lines with one
number on each line. |
When using the command, the argument can be shortened as long as it
remains unique; see Example 3 below.
All abundances are number relative to H.
Tables for xspecabundan Arguments
| H | 1.00e+0 | 1.00e+0 | 1.00e+0 |
1.00e+0 | 1.00e+0 | 1.00e+0 |
| He | 9.77e-2 | 9.77e-2 | 8.01e-2 |
8.51e-2 | 9.77e-2 | 7.92e-2 |
| Li | 1.45e-11 | 1.26e-11 | 2.19e-9 |
1.26e-11 | 0.00 | 1.90e-9 |
| B | 1.41e-11 | 2.51e-11 | 2.87e-11 |
2.51e-11 | 0.00 | 2.57e-11 |
| Be | 3.98e-10 | 3.55e-10 | 8.82e-10 |
3.55e-10 | 0.00 | 6.03e-10 |
| C | 3.63e-4 | 3.98e-4 | 4.45e-4 |
3.31e-4 | 2.40e-4 | 2.45e-4 |
| N | 1.12e-4 | 1.00e-4 | 9.12e-5 |
8.32e-5 | 7.59e-5 | 6.76e-5 |
| O | 8.51e-4 | 8.51e-4 | 7.39e-4 |
6.76e-4 | 4.90e-4 | 4.90e-4 |
| F | 3.63e-8 | 3.63e-8 | 3.10e-8 |
3.63e-8 | 0.00 | 2.88e-8 |
| Ne | 1.23e-4 | 1.29e-4 | 1.38e-4 |
1.20e-4 | 8.71e-5 | 7.41e-5 |
| Na | 2.14e-6 | 2.14e-6 | 2.10e-6 |
2.14e-6 | 1.45e-6 | 1.99e-6 |
| Mg | 3.80e-5 | 3.80e-5 | 3.95e-5 |
3.80e-5 | 2.51e-5 | 3.55e-5 |
| Al | 2.95e-6 | 2.95e-6 | 3.12e-6 |
2.95e-6 | 2.14e-6 | 2.88e-6 |
| Si | 3.55e-5 | 3.55e-5 | 3.68e-5 |
3.55e-5 | 1.86e-5 | 3.47e-5 |
| P | 2.82e-7 | 2.82e-7 | 3.82e-7 |
2.82e-7 | 2.63e-7 | 2.88e-7 |
| S | 1.62e-5 | 1.62e-5 | 1.89e-5 |
2.14e-5 | 1.23e-5 | 1.55e-5 |
| Cl | 1.88e-7 | 1.88e-7 | 1.93e-7 |
3.16e-7 | 1.32e-7 | 1.82e-7 |
| Ar | 3.63e-6 | 4.47e-6 | 3.82e-6 |
2.51e-6 | 2.57e-6 | 3.55e-6 |
| K | 1.32e-7 | 1.32e-7 | 1.39e-7 |
1.32e-7 | 0.00 | 1.29e-7 |
| Ca | 2.29e-6 | 2.29e-6 | 2.25e-6 |
2.29e-6 | 1.58e-6 | 2.19e-6 |
| Sc | 1.26e-9 | 1.48e-9 | 1.24e-9 |
1.48e-9 | 0.00 | 1.17e-9 |
| Ti | 9.77e-8 | 1.05e-7 | 8.82e-8 |
1.05e-7 | 6.46e-8 | 8.32e-8 |
| V | 1.00e-8 | 1.00e-8 | 1.08e-8 |
1.00e-8 | 0.00 | 1.00e-8 |
| Cr | 4.68e-7 | 4.84e-7 | 4.93e-7 |
4.68e-7 | 3.24e-7 | 4.47e-7 |
| Mn | 2.45e-7 | 2.45e-7 | 3.50e-7 |
2.45e-7 | 2.19e-7 | 3.16e-7 |
| Fe | 4.68e-5 | 3.24e-5 | 3.31e-5 |
3.16e-5 | 2.69e-5 | 2.95e-5 |
| Co | 8.60e-8 | 8.60e-8 | 8.27e-8 |
8.32e-8 | 8.32e-8 | 8.13e-8 |
| Ni | 1.78e-6 | 1.78e-6 | 1.81e-6 |
1.78e-6 | 1.12e-6 | 1.66e-6 |
| Cu | 1.62e-8 | 1.62e-8 | 1.89e-8 |
1.62e-8 | 0.00 | 1.82e-8 |
| Zn | 3.98e-8 | 3.98e-8 | 4.63e-8 |
3.98e-8 | 0.00 | 4.27e-8 |
This information is taken from the XSpec User's Guide. Version 11.3.1.x of the XSpec
models is supplied with CIAO 3.2.
Run the XSPEC command abund,
setting abundances to Feldman:
sherpa> XSPEC ABUNDAN FELD
Abundances set to Feldman
Reset the abundances to the default value:
sherpa> XSPEC ABUNDAN ANGR
Abundances set to Anders & Grevesse
The argument can be shortened as long as it remains unique.
sherpa> XSPEC ABUNDAN W
Abundances set to Wilms et al.
sherpa> XSPEC ABUNDAN F
Abundances set to Feldman
sherpa> XSPEC ABUNDAN G
Abundances set to Grevesse & Sauval
In the case of the two arguments that begin with "AN", "ANGR" takes
precedence over "ANEB" if only the first or second letter is given:
sherpa> XSPEC ABUNDAN A
Abundances set to Anders & Grevesse
sherpa> XSPEC ABUNDAN AN
Abundances set to Anders & Grevesse
sherpa> XSPEC ABUNDAN ANE
Abundances set to Anders & Ebihara
Read custom abundances from a file:
sherpa> XSPEC ABUNDAN FILE abund.txt
Abundances set to those read from file
For a list of known bugs and issues with the XSPEC models, please visit the XSPEC bugs page.
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