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Photometry & spectrophotometry of the Herbig Ae star RR Tauri

Boyd, D.

Multicolour broadband photometry and flux-calibrated low-resolution spectroscopy, obtained between 2014 & 2018, are used to investigate the behaviour of the highly variable Herbig Ae star RR Tauri.

New measurements and analysis of the Beta Cephei star V909 Cassiopeiae

Boyd, D.; Koff, R.

V909 Cas is a little-studied example of a Beta Cep pulsating variable star, located in the OB association Cas OB8 in the Perseus spiral arm of the Milky Way. Photometric observations in 2016-'17 provided thirty new times of pulsation extrema and enabled its mean pulsation period to be determined as 0.2067798(1)d. From spectroscopic observations we…