Search for pulsation among suspected A-type binaries and the new multiperiodic <i>δ</i> Scuti star HD 217860
Search for pulsation among suspected A-type binaries and the new multiperiodic <i>δ</i> Scuti star HD 217860
Context.In the H-R diagram, the intersection of the main sequence and the classical Cepheid instability strip corresponds to a domain where a rich variety of atmospheric phenomena are at play (including pulsation, radiative diffusion, convection). Main-sequence A-type stars are among the best candidates to study the complex interplay between these …