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Hi all, here is my last RR Lyr observation. Weather was very bad in the last weeks...

Relevant observation data:
- JD 2456225
- Date: 2012-10-24
- Observer: Paolo Berardi
- Exposure time: 300s
- Number of spectra: 31
- Duration: 2.5 hours
- Instrument: C9.25 - Lhires III 1200 - SXVR-H694
- WL range: 6330-6800 A
- R: ~5000

Animation series in cropped range 6500-6700 A:



2d dynamic spectrum of h-alpha line in cropped range 6542-6581 A:



Time evolution of h-alpha line (24 spectra in cropped range 6520-6605 A)



Umberto Sollecchia simultaneous observation with Star Analyser 100:



Ciao!
Paolo

Paolo your spectra are really exceptionnal of quality!

Fine setup Lhires III + C9. Could you precise the slit width (23 microns, 35 microns, ...) ?

Christian B

I'm glad for this Christian, your advices in OHP were very useful!
I'm quite happy with the setup. C9 is still easily manageable and it seems to me has a sufficent light collection.

For the efficiency I think most comes from the use of the sensor ICX694 in binning 2x2 mode and 35 micron slit (used up to now for my RR lyr observation). About resolution, I have noticed a considerable difference between the results obtained with the 35 um and 23 um slit aperture. But in my test in the same evening on AZ Cas I have detected a light loss of about 30%. I'm actually trying to capture an AZ Cas spectrum with 23 microns slit (2400 l/mm grating). When I reduce data I'll show you the result. I would like to know if, with AZ Cas, it's worth using the 23 um slit with my setup.

See you!
Paolo