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Paper: Stratification of Elements in Main-sequence CP Stars and Their Observational Effects
Volume: 462, Progress in Solar/Stellar Physics with Helio- and Asteroseismology
Page: 80
Authors: Alecian, G.
Abstract: According to the diffusion model, the observed large abundance anomalies in chemically peculiar (CP) stars are a consequence of chemical stratification in their atmospheres. All the elements are affected. However, the stratification process does not only concern the atmospheres, but also internal layers. Such a chemical stratification has several consequences. The most obvious one is the impact on the abundance determinations and their interpretation. Another consequence is a significant modification of the Rosseland opacity of internal layers, due to the enhancement of iron-peak elements. This necessarily affects the internal structure and asteroseismic properties of these stars. Another aspect, also related to the diffusion processes, is the consequence of the possible existence of weak undetected magnetic fields in those of the CP stars usually considered as non-magnetic (HgMn). This point will be discussed in the present paper and it will be shown that such a situation is not incompatible with the diffusion model, and moreover, could explain some recent observations of spectroscopic variations.
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