10 new γ Doradus and δ Scuti stars

We present high-resolution spectroscopy and precision photometry of five new gamma Doradus and five new delta Scuti variables. The five new gamma Doradus variables substantially increase the number of confirmed stars of this class. All 10 stars fall in the spectral class range F0-F2, but they are cleanly separated into two groups by their luminosity and photometric periods. However, the period gap between the gamma Doradus and delta Scuti stars is becoming very narrow since we confirm that HD 155154 is a gamma Doradus star with the shortest periods reported to date (the shortest of its four periods is similar to0.312 days). We do not find any evidence in our sample for stars exhibiting both delta Scuti- and gamma Doradus-type pulsations.