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We study the pulsational stability of the rapidly rotating Be star HD 163868using a newly developed 2D oscillation code which takes the Coriolis forcefully into account and compare our results with observations (MOST) and recentother stability analyses of this ~ 6 Msun star. We find both prograde andretrograde overstable modes (although more prograde than retrograde modes) andconfirm the existence of low degree odd r-modes destabilised by thekappa-mechanism. The ultra-low frequency modes that could not be explained in aprevious analysis are interpreted as high degree, retrograde m=1 modes. Areasonably good fit to the observed oscillation spectrum is possible if weassume that only even modes are observed. This requires a nearly equator-onview of the observed star, consistent with the measured high v sin i value of250 km/s.

Non-radial oscillations of the rapidly rotating Be star HD 163868