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Thanks again to all. Very interesting spectra Etienne. One very big difference between Etienne's spectrum and my own is that his is of the sun. If the sun doesn't fully illuminate the slit, nothing will. So I think there may be merit to Benji's suggestion that assuming a gaussian lineshape may under...

Thanks to all for your answers to my questions. I do use the calibration lamp. The resulting calibration spectrum was used when I processed the spectrum with ISIS. I observed the star 2 days later and calculated a resolution power of 551.5. Here is the image from that day, with the data points label...

When I calculate the resolution power with ISIS, I typically get values around 520 -560. I'm sure that I don't completely understand the concept of resolution, but I was asked how, with such low resolution, I could observe small values and small changes in the EW of Balmer lines. I also don't think ...

Very nice work. As I looked at the spectra of the late type stars I wondered if any could be found in Bulletin 81, the predicted maxima and minima for long period variables of the AAVSO https://www.aavso.org/sites/default/files/Bulletin2018.pdf Unfortunately I couldn’t find any. Is there a similar d...

And finally, last night under a bright moon.
Eta Leo and R Leo, slowly dimishing

5 days later, slowly decreasing
Eta Leo R Leo A week after this.
Eta Leo and R Leo

Two days later...
Eta Leo reference and R Leo The increase in the UV part of the continuum seems much less.

04/07/2018 was a little after maximum, when Balmer emission is likely at maximum, but the results were a little surprising, so any opinions are welcome. Here is the reference, Eta Leo, 20 images of 12 s, the same as all the others Eta Leo 04072018.png It looks very similar to me. In ISIS the rms for...

On 03/31/2018
Eta Leo reference R Leo

on 03/26/2018
Eta Leo reference and R Leo