Quote:
Originally Posted by theodog
Cheers Renormalised, will do so soon.
Terry,
I have managed to spec Gamvel myself and have the raw results below Resol= 13A/pix through the 4" f9.
Do these seem right to you?
If so, I'm on the right track & what do I do from here?
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This is verygood. It is quite similar to mine. I have corrected mine for the instrument response. This star probably isn't a good one to use as the basis for working out the instrument response. Choose a A or F star taken with the same configuration as Gamvela.
Open it and calibrate it. Then open a catalogue spectra of the same class of star.
Divide your spectra by the catalogue spectra. This will give you something like the first pic. The raw image is blue and the divided in green.
Then under the radiometry tab there is a function called "compute continuum"
Hit this and another toolbar appears. Push the first button to make it select points. Then select points along the continuum missing the absorption or emission lines.
When you are happy push the 4th button and a sloder appears. Change the number to 2000 and push the x10 button. I found it needs to be about 1200 to give a nice smooth graph. The result is your instrument response graph.
Go into the edit menu and push the replace button. Replace the ref 2 withthis graph then save the profile. It will then save it for future use.
After this you need to divide your raw gamma vela spectra by the instrument response graph. It should end up looking more like mine.
