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Hi Francois, Yes, good to be back. :-) I use a LISA on a C11. I now use the following 22 lines from the LISA Ar/Ne lamp in a .lst file with a 4th order polynomial. This typically gives an rms in ISIS of around 0.08 and a resolving power of about 1100. 4 1.8 7383.980 7272.936 7147.042 7067.218 6965.4...

A spectrum of C/2022 E3 ZTF taken on 6th February with a LISA spectrograph on C11 scope. Emission features tentatively identified.
David

Another spectrum of GK Per as it slowly fades. This was calibrated in absolute flux with a concurrently measured mean V magnitude of 10.95.
David

Hello Hubert, Yes, these are different processes. Flickering is intrinsic in the accretion process in a CV while scintillation is an atmospheric phenomenon. There is a useful source of data on scintillation at http://astro.corlan.net/gcx/scint.txt. This shows that scintillation varies strongly with ...

Hello Hubert, According to Bruch, A&A, 266, 237 (1992) the mean B-V colour index of the flickering light source in GK Per is close to 0 so the B and V magnitudes should change together, subject to the stochastic variation inherent in the flickering process. The exposures were alternately 10 sec ...

Here is another spectrum of GK Per taken on 20th January and calibrated in absolute flux using concurrently measured V magnitudes with a mean of V = 10.96. gkper_20230120_842_D_Boyd.png I continued to record B and V magnitudes for 1.4 hrs while recording the spectra and the resulting light curves an...

Another spectrum of GK Per taken with a LISA (R~1000) and flux calibrated using a V magnitude concurrently recorded by Franky Dubois (AAVSO AID).

David

Guider image of OY Cyg Spectrum of OY Cyg Looks like a M6III - M7III spectrum.

David

I should also add that this line list assumes you have the newer Ar/Ne lamp in the LISA calibration unit.

David

Hello David, I am using an SX-H694 camera (which has the same CCD as the Atik 460) binned 1x1 on my LISA with a 23 micron slit on a C11 at f/5. I focus the LISA objective using the 5852 A line in the calibration lamp spectrum. I use File Mode calibration in the General tab in ISIS with the following...