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The solar modelling problem: where do we stand, where are we going?

GaŽl Buldgen
Geneva Observatory, Switzerland

Abstract
The revision of the solar abundances by Asplund et al. in 2005 led to a significant issue in solar and stellar modelling, as the so-called Standard Solar Models, as defined by John Bahcall in 1980s, were now in strong disagreement with helioseismic data. Fifteen years later, and after additional revisions by Asplund et al. in 2009 and 2015, the solar problem still remains unsolved. In this seminar, I will discuss the implication of the solar modelling problem for asteroseismic modelling of distant stars, recent progress on this issue as well as how its solution is deeply rooted in the way we compute stellar evolution models. I will also discuss how the generalization of seismic inversion techniques, used successfully in helioseismology, will prove helpful in using distant stars as laboratories of stellar physics and going beyond the Standard Model framework and how the Sun still remains, to this day, an anchoring point for other issues such as the angular momentum transport problem we see in evolved stars such as subgiants and red giants.

2020 December 09, 13:30

IA
Online broadcast (Zoom)

Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia