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Miras are fascinating stars. A kappa-mechanism in their atmosphere drivespulsations which produce changes in their photometric brightness, apparentspectral type and effective temperature. These pulsations also drive theformation of Balmer emission lines in the spectrum. This behaviour can beobserved and investigated with small telescopes. We report on a three-yearproject combining spectroscopy and photometry to analyse the behaviour of Mirastars SU Cam and RY Cep, and describe how their brightness, colour, spectraltype, effective temperature and Balmer emission vary over four pulsationcycles.

Spectroscopic and photometric study of the Mira stars SU Camelopardalis and RY Cephei