Recent advances in modeling stellar interiors

Abstract

Advances in stellar interior modeling are being driven by new data from large-scale surveys and highprecision photometric and spectroscopic observations. Here we focus on single stars in normal evolutionary phases; we will not discuss the many advances in modeling star formation, interacting binaries, supernovae, or neutron stars. We review briefly: 1) updates to input physics of stellar models; 2) progress in two and threedimensional evolution and hydrodynamic models; 3) insights from oscillation data used to infer stellar interior structure and validate model predictions (asteroseismology). We close by highlighting a few outstanding problems, e.g., the driving mechanisms for hybrid γ Dor/δ Sct star pulsations, the cause of giant eruptions seen in luminous blue variables such as η Car and P Cyg, and the solar abundance problem.

Inversions of Stellar Structure From Asteroseismic Data

“…For stellar systems such as binaries or clusters, simultaneous fitting of all members can even be done so that the modelling is more constraining, sometimes assuming the same chemical composition and age for all members. We hereby provide for the interested reader a few additional references on seismic modelling and asteroseismology of solar-like oscillators Roxburgh (2002); Christensen-Dalsgaard and Houdek (2010); Guzik (2011);Goupil et al (2011); Chaplin and Miglio (2013); Di Mauro (2016) as well as seismic studies of stellar clusters (Handberg et al, 2017;McKeever et al, 2019) and binaries (see e.g., Bazot et al, 2016;Bazot, 2020;Salmon et al, 2021). In other cases, an inversion can refer to the determination of the internal structure of a given star in a static way, departing from hypotheses regarding its evolutionary history.…”

Inversions of stellar structure from asteroseismic data

“…For stellar systems such as binaries or clusters, simultaneous fitting of all members can even be done so that the modelling is more constraining, sometimes assuming the same chemical composition and age for all members. We hereby provide for the interested reader a few additional references on seismic modelling and asteroseismology of solar-like oscillators Roxburgh (2002); Christensen-Dalsgaard and Houdek (2010); Guzik (2011);Goupil et al (2011); Chaplin and Miglio (2013); Di Mauro (2016) as well as seismic studies of stellar clusters (Handberg et al, 2017;McKeever et al, 2019) and binaries (see e.g. Bazot et al, 2016;Bazot, 2020;Salmon et al, 2021).…”

Concluding remarks

“…As with atomic and molecular data, the astrophysicist is dependent on numerical calculations to obtain the 06001-p. 8 Ageing Low Mass Stars: From Red Giants to White Dwarfs necessary rates. Guzik [98] and Wiescher et al [99] summarise available sources of nuclear reaction rates and existing uncertainties. In addition Goriely et al [100] point out that reaction rates for medium or heavy nuclei, used in astrophysical applications, are traditionally calculated using a statistical model [101] with simplified methods to estimate capture reaction cross-sections which in some cases have never been tested.…”

“…Guzik [98] presents a comprehensive summary of two dimensional and 3D stellar interior models and of what may be achieved through their use. A further success of 3D simulations may be noted.…”