Nonradial and radial period changes of the<i>δ</i>Scuti star 4 CVn
Nonradial and radial period changes of the<i>δ</i>Scuti star 4 CVn
Aims. Radial and nonradial pulsators on and near the main sequence show period and amplitude changes that are too large to be the product of stellar evolution. The multiperiodic δ Sct stars are well suited to study this, as the period changes of different modes excited in the same star …