IR data reduction: Lecture 3 Sarah Casewell :[email protected] Notes and presentations at: www2.le.ac.uk/departments/physics/people/academic-staff/slc25
• www.le.ac.uk
Department of Physics & Astronomy
IRAF and xmosaic:
• Reducing IR imaging data
• Load up iraf in an xgterm (I prefer a scrollbar)
• Load noao, imred, ccdred and xdimsum
• Most preprocessing done in ccdproc
• Mosaic done in xmoasic
Imaging
1. Sort out the frames according to their object types and exposure times: (hselect in IRAF, more in a non-resized terminal) 2. Subtract a bias frame (if you have one) from all other frames
3. Investigate what sort of flat you have and process accordingly
4. Divide all remaining frames (arc, std, object) by the flat
5. BPM subtract, Sky subtract, Mosaic