Re: C2020 F3 (NEOWISE) spectrum
Posted: Fri Aug 07, 2020 1:35 pm
Thank you Robin,
I understand the principle of the method, but at the end of the process some details are non so clear, so I summarize what I would do if I intended reproduce the process, please tell me if I am OK or not.
"The spectra were first calibrated in relative flux using a nearby reference star." ==> OK clear
"The sky background was removed using a region at the edge of the slit away from the comet" ==> OK clear
" The dust component was then subtracted using a template derived from the Pickles G2v spectrum" ==> I understand that you divide the comet profile by a profile derived from the G2V spectrum.
Now the point is what will I do to obtain this template?
1/ using ISIS tool "continuum" I extract the continuum profile of the GV2 star profile and save it
2/ Then I open the comet's profile
3/I divide the comet's profile by the GV2 profile continuum
I obtained a comet spectrum in which the relative intensities between the different emission lines are not modified, with a quite flat continuum. The corrected profile is not drastically different from the uncorrected comet profile, but the difference is visible.
Hubert
I understand the principle of the method, but at the end of the process some details are non so clear, so I summarize what I would do if I intended reproduce the process, please tell me if I am OK or not.
"The spectra were first calibrated in relative flux using a nearby reference star." ==> OK clear
"The sky background was removed using a region at the edge of the slit away from the comet" ==> OK clear
" The dust component was then subtracted using a template derived from the Pickles G2v spectrum" ==> I understand that you divide the comet profile by a profile derived from the G2V spectrum.
Now the point is what will I do to obtain this template?
1/ using ISIS tool "continuum" I extract the continuum profile of the GV2 star profile and save it
2/ Then I open the comet's profile
3/I divide the comet's profile by the GV2 profile continuum
I obtained a comet spectrum in which the relative intensities between the different emission lines are not modified, with a quite flat continuum. The corrected profile is not drastically different from the uncorrected comet profile, but the difference is visible.
Hubert