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BgreductionDR.Bgreduction HistoryHide minor edits - Show changes to markup November 30, 2009, at 08:56 CET
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- Changed lines 1-2 from:
Since ca. Oct 2008 (or version 1.7) MIA+EWS takes into account that the PRISM spectrum is moving on the detector. Previously the information about the curvedness of the spectrum had been stored in the WCS (World Coordinates) part of the FITS headers. There is now a function wcscurve (in MIA/mask_utilities.pro) that extracts this information to display lines in the miamask GUI. to:
Since ca. Oct 2009 (or version 1.7) MIA+EWS takes into account that the PRISM spectrum is moving on the detector. Previously the information about the curvedness of the spectrum had been stored in the WCS (World Coordinates) part of the FITS headers. There is now a function wcscurve (in MIA/mask_utilities.pro) that extracts this information to display lines in the miamask GUI. November 27, 2009, at 17:53 CET
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- Added lines 1-17:
Since ca. Oct 2008 (or version 1.7) MIA+EWS takes into account that the PRISM spectrum is moving on the detector. Previously the information about the curvedness of the spectrum had been stored in the WCS (World Coordinates) part of the FITS headers. There is now a function wcscurve (in MIA/mask_utilities.pro) that extracts this information to display lines in the miamask GUI. For MIAThe change is twofold:
For EWSThe above doesn't apply since EWS doesn't call MIA/utilities.pro but EWS/idl/ews/midi/utilities/midiUtilities.pro where this changed has not (yet?) been applied, i.e. if you want to take care of the shifting spectrum in EWS to do a decent background subtraction for your 'photometry' (uncorrelated spectra), you have to do it manually. There are some tools in MIA+EWS that can help you with this:
Note that in oirChopPhotoImages.c there is a You should do the mask shifting with a bright calibrator star and then used this shifted mask for your science files. Ideas for improvements
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