Skip to main content
Type of talk
Prof. Gregg Wade
Royal Military College of Canada
Date and Time of Talk

Stars of late A/early F spectral types on the main sequence occupy a key region on the H-R diagram, wherein their atmospheres transition from being principally radiative at temperatures around 8000 K to being principally convective around 6000 K. On the warm side of this transition sit the coolest Ap stars, strongly magnetic stars exhibiting intense and non-uniform chemical peculiarities in their atmospheres. Many of these very cool Ap stars are rapidly oscillating (ro) Ap stars. These roAp stars are high-overtone, non-radial p-mode pulsators, exhibiting mode amplitudes that are modulated according to the local magnetic field strength.

In this talk I will review the properties of the coolest Ap stars and describe an ongoing experiment aimed at understanding the transition from the fossil magnetic fields of roAp stars to the dynamo fields of solar-type stars as a consequence of convective field processing by the growing hydrogen convection zone.

Email Speaker
About Speaker

Prof. Gregg Wade investigates the structure, evolution, origin and impact of magnetic fields in stars. His research concentrates on intermediate and high mass stars, which are the evolutionary progenitors of most white dwarfs, neutron stars and stellar-mass black holes.

Email Host
Host Name
Host Phone (ext/mob)