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Re: HeI 6678 Campaign of gamma Cas

PostPosted: Thu Feb 04, 2021 3:58 pm
by jack martin
Robin,

The spectrum is in the same Y position on the sensor for all observations.

Its on all the sub exposures.

I did not take a reference star spectrum.

Regards,

Jack

Essex UK

Re: HeI 6678 Campaign of gamma Cas

PostPosted: Thu Feb 04, 2021 5:47 pm
by jack martin
JLB and Robin,

As fits format is not allowed, I can email fits images for further discussion.

Regards,

Jack

Essex UK

Re: HeI 6678 Campaign of gamma Cas

PostPosted: Sat Feb 13, 2021 5:58 pm
by Robin Leadbeater
It is a flat defect.
See my reply here

https://groups.io/g/astronomicalspectro ... sage/16570

In cases of defects like this a good test is to bin the flat in the same location to check if it is a problem with the flat correction


Cheers
Robin

Re: HeI 6678 Campaign of gamma Cas

PostPosted: Sat Feb 20, 2021 8:44 am
by Ernst Pollmann
Dear colleagues,
the attached overview informs about the relationship between the Halpha and HeI6678 emission activities of gamma Cas.
As you can see, the EW of Halpha and HeI6678 are correlated in long-term view (upper Fig.) and short-term view (middle Fig.).
The lower Fig. , were only contemporaneous EW data of Halpha and HeI6768 had been used, underlines the character of the correlation particularly clear.
The short-term view (middle Fig.) shows a kind of outburst after JD 2459000, which had been also monitored of our professional colleagues Myron Smith and Gregor Rauw with the X-ray (XMM) satellite telescope.
Thank you very much to A. Stiewing, U. Zurmühl, E. Bryssinck, P. Somoguy, K. Alich, D. Doctor & J. Martin for your usefull spectra contribution after JD 2458800 to this project.
correlation overview.png
correlation overview.png (110.38 KiB) Viewed 2770 times

Ernst Pollmann

Re: HeI 6678 Campaign of gamma Cas

PostPosted: Sat Mar 27, 2021 9:33 am
by Ernst Pollmann
Dear colleagues,
for information and supplement here the current state of the correlation monitoring.
Questions?
total overview.png
total overview.png (131.63 KiB) Viewed 2408 times

Ernst Pollmann

Re: HeI 6678 Campaign of gamma Cas

PostPosted: Tue May 11, 2021 3:31 pm
by Ernst Pollmann
Dear colleagues,
for interested observers here a new publication:
"The correlation between Halpha and HeI6678 emission activity in the Be star gamma Cas from 1995 to 2021".
See:
https://app.aavso.org/jaavso/article/3721/

Ernst Pollmann