Quote:
Originally Posted by Glenpiper
Al,
That is an excellent result, and it also supports my earlier results. I'm glad you went for the longer exposures 
While it isn't possible to do a correct profile comparison of our spectra, as mine wasn't corrected for instrumental response (was yours?), it is interesting to note that the H alpha / H beta amplitude ratio has decreased in the last few days ... which I interpret to mean that the source (envelope) has cooled a bit.
The clouds cleared here earlier on ... the first night in over a week, and the night i had to be out to dinner ... good old sod's law. |
No Bernard, this spectrum was not corrected for camera response (yet). I captured a spectrum of Antares as well last night so when I process that, I hope to get a response curve I can use on this. I had to do this one first though to determine my dispersion with the new spacer arrangement though.
Here comes a newbie question
... When you say the amplitude ratio, I assume you are simply comparing the height of the peaks between Ha and Hb and not comparing FWHM?
Quote:
Originally Posted by Merlin66
Bernard,
It's good to have you around...look forward to your report back after NZ trip.
Al,
Love it!
Why 13.7sec exposures ( why not!?)
Before anyone asks
"How do you get coloured spectra from a mono DMK camera"
No - you don't use RBG filters!!!!
|
13.7s was about as long as I could go without saturating the Ha line I reckoned. The whole histogram in IC Capture was used with just a few zeros flashing in at the top end.
BTW at this exposure the image of eta carinae itself was ugly... the star image was an oval due to the homunculus. This is something I had been trying to avoid with the shorter exposures.
Al.