American Association of Variable Star Observers (AAVSO)
Sun, 08/29/2021 - 08:36

Some news of gamma Cas:
XMM and TIGRE observations were started on July 25th (G. Rauw, M. Smith, Y. Naze). The professional colleagues are currently working on this data together with our observations (spectra).
In the sense of our further observations, here the current status of the primary spectra evaluation of the EW of Halpha and HeI6678.
Since the beginning of the amateur observations from April 1994, such a cyclical behavior of the two EW (see the attached plot) has not yet been observed. W
e can be curious to see what conclusions the XMM and TIGRE observations will lead to.

Ernst Pollmann