| Re: how to align the position of the absorption line for different files at one single postion [message #80366] |
Mon, 11 June 2012 23:45 |
bstecklu
Messages: 14
Registered: February 2012
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Junior Member |
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You might consider two methods for the alignment, cross-correlation and
line-profile fitting. If you rely just on one line, profile fitting will do
(cross-correlation is advantageous in case of many lines). However, using one
line might be dangerous if the spectral bandwidth is not much smaller than the
wavelength, otherwise the wavelength dependence of the dispersion might cause
trouble (if the spectrograph is not extremely stable).
Bringfried
sid wrote:
> Hi all,
> I have a problem, I have an absorption line which occurs at
> different positions for different files. I have to align those centre
> of the absorption line at a particular position in order to do
> wavelength calibration for all files. I have to do this in a loop.
> Please let me know if you have some suggestions or any idl routines
> for this purpose.
> thanking you in advance.
> sid
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