AAVSO Alert Notice 694 announces a spectroscopy observing campaign on the very bright Be star gamma Cas. Please see the notice for details and observing instructions.
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
AAVSO Alert Notice 694 announces a spectroscopy observing campaign on the very bright Be star gamma Cas. Please see the notice for details and observing instructions.
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
In a note I added to Alert Notice 694 on gamma Cas on May 21, I said that Principal Investigator Ernst Pollmann was particularly requesting higher-resolution spectra of gam Cas. However I said the requested resolution was 1000 or higher, when I should have said 10000 or higher. My apologies for this error.
Good observing,
Elizabeth
Can I suggest for completeness that observers also consider submitting their spectra to the Pro-Am Be star database BeSS which currently has 8989 spectra of this star covering from 1978 to the present day.
http://basebe.obspm.fr/basebe/
Thanks
Robin
AAVSO Alert Notice 707 contains an update of Ernst Pollmann's spectroscopy campaign on gamma Cas and gives the science behind his request and also shows some spectra of the line he is studying. Please see the notice for details and observing instructions.
DISCUSSION OF THIS CAMPAIGN MOVES TO THE THREADS FOR ALERT NOTICE 707 - please post your comments and questions there. (Please do not use this link from from Alert Notice 694 any longer.)
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
Dear Ernst and observers,
For an experiment (and reproduceability/flat analyis), I have made full night series of 3 nights.
I most likely haven't detected any flare, but seeing absorption velocity changes (emission peaks precisely in the middle), repeating in a given range during days - and similar change in 1 hour on 2020-JUL-04. I admit had to change my flat taking method fixing severe problems at this high SNR (and pixel shifts really causing continuum changes at low gradients), but this kind of change of the absorptions is obvious (R~17000, per-exposure calibration) and symmetric.
Spectra uploaded to avspec (5-6 spectra grouped and summed, 350-450 sec of exposures depending on my saturation estimate).
I am wondering whether if this kind of variablility of the absorptions is known, and need confirmation whether such a full night serie is meaningful and whether worth continue. Shooting the same target during a night suits me well, because being able to sleep (whilst shooting other targets is not an option for me).
Peter