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Wednesday 21 Feb 2018[Seminar] The evolution of chemical abundances in normal stars and the evolution of magnetic fields in massive stars

Dr. Alex Martin - Observatoire de Paris Meudon

Physics 4th Floor 14:00-15:00

Where present, magnetic fields have the potential to modify a variety of processes in stars. One such process is atomic diffusion. It has previously been shown that the magnetic fields of Ap/Bp stars directly affects the normal diffusion of chemical elements within the photosphere. However, chemical peculiarities are also observed in non-magnetic stars. As a result, to disentangle the various effects which may change the distribution of elements in the stellar photosphere, we must study the `control group' of "chemically normal" non-magnetic stars in conjunction with non-magnetic and magnetic chemically peculiar stars. In the first half of this seminar I will discuss my study of NGC6250. For the second half of the seminar I will focus on the interplay between magnetic fields and the evolution of massive stars. This is focus of the LIFE project with the final goal to add observational constraints to stellar evolutionary models by surveying giant and supergiant OBA type stars.

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