it has been quite some time, when I took my last spectra. That night (2013, May 06), I also wanted to test the suitability of my C5 for spectral observations. Combined with an Alan Gee shapley lens it worked quite well and is a nice and compact setup for Staranalyser and video camera (and light weight mount).
The spectra show Chi Cyg near maximum brightness 2013. H-delta and H-gamma emission lines are clearly visible, even in the raw spectrum. This star is a Mira-type variable with the longest period of all Mira-type stars, belonging to type S6. Its strong absorption bands are generated by ZrO, instead of TiO as for Mira-type M-class stars. Refering to Gray/Corbally, Stellar Spectral Classification, Mira-type stars often show H-gamma and H-delta in emission when they reach their maximum brightness.
Link to analysis Chi Cyg: http://www.aau.teleb...rumChiCyg/20...
For comparison, in 2010 I observed Mira itself at its maximum brightness (together with M-class star alp Ceti). Please refer to the following link. The H-emission-lines had been visible too.
Mira spectra: http://www.aau.teleb...ktrenomiCeta...
Chi Cyg near maximum brightness (spectrum)
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