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Chemical element transport in stars. Uncertainties and their impact on the study of stellar populations

Maurizio Salaris

Évènements associés

  • Le lundi 22 janvier 2018 de 11:00 à 12:00

Stellar evolution computations provide the foundation of several methods applied to study the evolutionary properties of stars and stellar populations. One particularly thorny issue is how to treat the transport of chemical elements in stellar evolution calculations. Mixing and element transport do not arise from the solution of the equations of stellar structure and evolution, instead they have to be added following recipes that involve a number of free parameters and/or are subject to sizable uncertainties. At the same time, the temporal evolution of the chemical profiles within stellar models is a main evolutionary driver, and can be in principle tested through spectroscopic observations of photospheric abundances of key elements, asteroseismic observations, and more indirectly through the effect on star counts (sensitive to evolutionary timescales) and evolutionary paths in colour-magnitude-diagrams, that are all affected by the internal chemical profiles.