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A two hours serie of CH Cyg (10 min. time resolution) with VHIRES MO spectrograph (R = 50 000 resolution) and Kepler 200 mm telescope (challenging small telescope observation - for the fun!). From 24.099 to 24.178 April, no chance, only a very small variation of Halpha line profile:



(here the two extreme date on the same graph and H2O telluric lines removed).

View of some part of CH Cyg spectrum (stack of 12 x 600 sec. exposures):















Now the sky is cloudy in Toulouse

Christian

Detail of Na lines (the 21.1 /04 / 2015) - C11 + VHIRES-MO:



also for the same date with the same setup a close look of green-blue region:





Part of an eShel spectrum taken the same date:



Christian