Effect of full-amplitude pulsation on Cepheid atmospheres and magnetic fields

Ascertain how full-amplitude pulsation affects the atmosphere and magnetic field in Cepheid pulsators, to enable interpretation of surface spot signatures and polarization relative to low-amplitude cases such as Polaris.

Background

The authors identify surface spots on Polaris and note its very low pulsation amplitude, suggesting similarities with non-variable supergiants that exhibit activity indicators.

They highlight that the impact of full-amplitude pulsation on the atmosphere and magnetic field is not established, making Polaris a useful comparative case for understanding these effects in Cepheids.