Forum der Vereinigung der Sternfreunde

Hallo,

This graphic is a small evidence of the Halpha variations of the star VV Cep.

Regards, Joan.

Hi Joan,

beside the interesting Halpha variation an impressive SN and correlation of both spectra. What was the exposure time?

Kind regards,

Ulrich

Hallo, Ulrich,

Answering your question, the graphic of day 20170604_005, is the result of 10 exposures of 160 secons and the other 10 exposures of 200 secons.

I always try to make the histogram of each integration, as complete as possible.

The reason for the 10 exposures, is that when promising, the graph is as reliable as possible. I do this even if the exposures are close to saturation. I hardly give up for good, observing a star with less than 6 integrations.

Regards, Joan.