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R Boo: Mira variable with emission lines

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About this observation
Observer
Kevin Gurney
Time of observation
21/03/2018 - 02:32
Object
R Boo, HD 128609
Observing location
West Sheffield
Equipment
Altair Astro 10in RC truss tube
Alpy 600 Spectrograph
Mesu 200 mount
Atik 460EX
Exposure
12 x 120sec sub-exposures
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R Boo is a Mira variable which has an interesting spectrum (class M8e). It shows the TiO molecular bands characteristic of class M but, more interestingly, shows emission lines at the Hydrogen Balmer series wavelengths. The spectrum attached was taken when the star was around magnitude 7.5-8 (best estimate from AAVSO website). The emission lines are clearly visible down to H9, but curiously H-epsilon is absent. Perhaps there is a nearby absorbtion line which blends with it to cancel it out?

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