|
R Boo: Mira variable with emission lines

Alpy 600 Spectrograph
Mesu 200 mount
Atik 460EX
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?