3/02/09

I thawed q on a line in epsilon Ori and one in delta Ori. So far, it looks like freeing q will minimize the wavelength trend of R0 in epsilon Ori, but increase the trend in delta Ori.

2/25/09

I forgot to plot some of the zeta Oph lines. They are now plotted and have web pages linked to the zeta Oph main page.

2/24/09

R0 values for the ten stars can now be found here. Zeta Oph has a line that I don't trust (maxed-out u0 value), but I haven't had the chance to plot it yet.

2/20/09

Mass-loss rates for both CNO-processed and solar abundance opacity models can be found here. Red dotted lines represent the solar abundance opacity model.

2/18/09

I'm going through all the stars and getting mass-loss rates for both the CNO and Solar abundance models. I'll make a page for all the stars when I fix a few little things in my Mathematica notebooks.

2/17/09

I forgot to make a page for the delta Ori Mg XII line. The situation is now remedied.

2/10/09

I fit the 16.78 line separately from the iron line complex. The fit gives a higher taustar value and a higher u0 value. In the fit log, I have records for thawing vinf, but I haven't put them on the page because they didn't change anything (including vinf) very much.

Star parameters for delta Ori can be found here. Unfortunately, delta Ori is one of the stars whose parameters I had to get from its spectral type.

I've plotted the four strongest lines from delta Ori together. The "absorption feature" in the 15.014 line could perhaps also be in the 16.78 line. It could also be responsible for the lack of counts blue-ward of line center in the oxygen line, but that takes some more imagination.

2/4/09

The shifted oxygen line and the iron line minus 0.02 angstroms can now be found on their respective pages: oxygen; iron.

2/3/09

I refit the 18.9689 line with the shift parameter thawed. With a 11 mA shift, the fit looks much better, but the rejection rate is still 99.9%. Also, images of the separate grating fits foe the 18.9689 line can now be found here.

Getting rid of a section of the 15.014 line significantly improved the fit and decreased the u0 parameter to a more reasonable value. However, the fit tends to be very sensitive to the blue wing, and I don't have a reason for getting rid of these bins.

2/2/09

I fit just the MEG data for the 15.014 line in delta Ori. From the fit log, you can see that, without the HEG data, the rejection probability is lower but the C-stat is now higher than the number of bins.

I fit the MEG +1 and -1 gratings separately for the 18.9689 line in delta Ori. Both grating orders give bad fits, but the MEG-1, which has higher S/N, gives a worse one: fit log.

1/27/09

The four lines for delta Ori are up here. Most fit logs also have fits for thawed vinf. A larger vinf is preferred in every instance. I found the rejection rates to be non-intuitive, as C > N for the 16-17 line complex, which has a reasonable rejection rate, while C < N for the 15.014 line, which has a high rejection rate.

I'll do one more line for delta Ori, and I'm also finishing up the strong lines in zeta Oph. zeta Oph's taustar values continue to be consistent with 0.

1/26/09

I've been working on several lines in delta Ori's spectrum. The lines have good S/N, but I'm getting a couple of high rejection rates. The fit of the Fe XVII line at 15.014 angstroms is rejected at the 98.6% level and the O XIII line at 18.9689 angstroms is rejected at the 99.9% level. On the other hand, the Ne X line at 12.013 angstroms has a perfectly respectable rejection probability of 59.6%, and the Fe XVII complex at 16-17 angstroms has a rejection rate of 65.3%. I did a bit of research on delta Ori to see if there are any factors that would prevent the wind profile model from describing its spectrum well, but I couldn't find anything. It's in a three-star system, but the other stars seem to be far enough away that colliding winds aren't an issue. I should have pages for the line fits up tomorrow.

Fall Term

Week 10

Week 9

Week 8

Week 7

Week 6

Week 5

Week 4

Week 3


Home Log Tasks
HD 93129AB HD 93250 9 Sgr ξ Per ζ Oph ζ Ori ε Ori ι Ori
ζ Pup HD 150136 Cyg OB2-8A 15 Mon τ CMa δ Ori