# Mg XII 8.421 Angstroms

## Non-porous models

Note: Both MEG and HEG are being fit simultaneously

Continuum fit on 8.25:8.35 and 8.50:8.60. For n=2, best-fit norm=1.65e-3. The 90% confidence limits on the normalization are +/-0.2e-3. And the best fit is formally a good fit.

Here are the 68%, 90%, and 95% joint confidence limits on taustar and *R*_{o} based on fitting the MEG and HEG data together. The filled circle represents the best-fit model, shown as the red histograms on the above two plots.

The above information (plots really, only; the fit didn't change) was updated on 5 Jan 09, but the information below, dates to May 2008.

The literature mass-loss rate implies a fiducial optical depth at the wavelength of this line of about taustar=4. From the confidence limit contour plot we can see that such a high value is ruled out. If we force a non-porous model to have this optical depth value, here is the best-fit model.

So, ΔC~27, ruling this model out at >99.99%. Note that the best-fit value of *u*_{o} is quite close to unity, but its value isn't tightly constrained at all. Finally, note that the Monte Carlo rejection probability is not all that high. Must be the poor S/N of the data...

Next, we fit isotropic porosity models to the data. And after that, anisotropic porosity models

Back to main page.

*last modified*: 5 January 2009