HD93129: Chandra grating spectrum
Alternate wind parameters
9.1687, 9.2297, 9.3143 Angstroms: Mg XI
vinf = 3200
β = 1.0
MEG
HEG |
[9.04:9.43], λo = 9.1687, 9.2297, 9.3143
vinf=3200 β=1 powerlaw continuum, n=2; norm=2.05e-4 q=0 hinf=0 taustar=1.97 +/- (0.91:4.37) 0.37:5.38 at 90% confidence Ro=2.41 +/- (1.01:3.71) G=0.37 +/- (0.22:0.63) φ-ratio = 147 norm=1.58e-5 +/- (1.45e-5:1.72e-5) rejection probability = ???% (C=412.14; N=464) fit log |
Here are the 68%, 90%, and 95% joint confidence limits on taustar and Ro. The filled circle represents the best-fit model, shown as the red histograms on the above plots.
Note that the best-fit point is actually a bit off the top of the contour plot.
Note also that the best-fit G value is pretty small. Here's a fit for which we froze G at 0.71, the value expected from atomic physics at the temperature of peak emissivity. (If anything, real, high S/N data tend to show somewhat higher values than this.)
last modified: 30 January 2011