Hello Christian,
thank you for the constant improvement of ISIS. The description of the process flow for the echelle:
http://www.astrosurf.com/buil/isis/eshe ... chelle.htm
is most useful and long awaited. I am proposing ISIS as a standard for the Swiss spectroscopy group with some success, both for LHIRES and echelle users. see e.g.
http://www.astronomie.ch/forum/viewtopi ... =28&t=6278 (ISIS manual in german)
With the bad weather lately I had the opportunity to test the program with a slightly off topic spectrum but fitting the weather of the last weeks. The lightning was recorded by Martin Huwiler in a single image taken from a movie:
- lightning recorded by Martin Huwilwer, Canon G1x 300 L/mm grating
- Blitzspektrum.PNG (290.5 KiB) Viewed 5687 times
It was analyzed first with IRIS
- preprocessing with IRIS
- Blitzspektrum IRIS2.PNG (32.18 KiB) Viewed 5687 times
and for the calibration ISIS was used, with N II lines from the NIST database:
http://physics.nist.gov/PhysRefData/Han ... table4.htm
- calibration with H and N II lines
- Blitz Calibration.PNG (31.27 KiB) Viewed 5687 times
At this point the possibility to save and load line lists of the the new version comes in very handy for testing different calibrations!
The result came out quite satisfactory (no instrument response yet):
- calibrated spectrum
- blitz_cal2label.PNG (90.27 KiB) Viewed 5687 times
.
I also tried to improve th appearance of the spectrum by oversampling the initial image in IRIS with a scaling by a factor two, in order to partially reduce the effect of undersampling the image in the low resolution movie mode (the camera lens is better than the image resolution):
- improvement of lineshape by subsampling
- blitz subsample.png (7.35 KiB) Viewed 5687 times
But of course, most important for me are the echelle improvements.
Regards,
Martin