The hot Gamma-Doradus and Maia stars

The hot \(\gamma\)~Doradus stars have multiple low frequencies characteristic of \(\gamma\)~Dor or SPB variables, but are located between the red edge of the SPB and the blue edge of the \(\gamma\)~Dor instability strips where all low-frequency modes are stable in current models of these stars. Though \(\delta\)~Sct stars also have low frequencies, there is no sign of high frequencies in hot \(\gamma\)~Dor stars. We obtained spectra to refine the locations of some of these stars in the H-R diagram and conclude that these are, indeed, anomalous pulsating stars. The Maia variables have multiple high frequencies characteristic of \(\beta\)~Cep and \(\delta\)~Sct stars, but lie between the red edge of the \(\beta\)~Cep and the blue edge of the \(\delta\)~Sct instability strips. We compile a list of all Maia candidates and obtain spectra of two of these stars. Again, it seems likely that these are anomalous pulsating stars which are currently not understood.