Bartol Research Institute, University of Delaware, Newark, DE 19716, USA

The stability of retrograde mixed modes in rotating B-type stars is investigated. It is found that these modes are susceptible to -mechanism excitation, due to the iron opacity bump at logT~5.3. The findings are discussed in the context of the pulsation of SPB and Be stars.

To appear in "Active OB Stars: Laboratories for Stellar & Circumstellar Physics", ASP Conf. Ser. 2005, S. Stefl, S. P. Owocki, & A. Okazaki, eds.
Preprints from rhdt@bartol.udel.edu
Or on the web at http://www.star.ucl.ac.uk/~rhdt/publications/