Fe XVII 15.014 Angstroms
Models with anisotropic porosity
Note: Both MEG and HEG are being fit simultaneously
Note that the opacity bridging law used for these isoporosity fits is Rosseland.
Note that the above parameters don't agree exactly with those from the baseline (non-porous) fit, despite the fact that the above model has hinf=0. The parameter values are very close, though. The slight difference is just a result of the relative flatness of the fit statistic in the portion of parameter space surrounding the global minimum.
Here are the 68%, 90%, and 95% joint confidence limits on hinf and taustar. The asterisk represents the best-fit model, shown as the red histograms on the above two plots.
Models with anisotropic porosity provide such a bad fit, that even modest values of the porosity length are ruled out. And consequently, allowing a non-zero porosity length does not affect the confidence contours in taustar-uo parameter space. So we do not show a new version of that plot here.
Forcing a fit with taustar=8, the value implied by the literature mass-loss rate:
powerlaw continuum, n=2; norm=1.71e-3
hinf=1.59 +/- (1.26:2.04) and for 90%
uo=0.663 +/- (0.620:0.715)
norm=5.28e-4 +/- (5.08e-4:5.48e-4)
rejection probability = 84% (C=322.37; N=308)
Note that ΔC=42 (compared to the global best-fit model, which has zero porosity length), highly ruling out this model.
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last modified: 28 April 2008