Preliminary Material

Roxburgh, David J.

doi:10.1163/9789004491830_001

Cited by 1 publication

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, our models predict lower values of α pen than are estimated in these samples. Even at low masses, we predict a smaller penetration extent than was observationally determined by Claret & Torres (2019), who related their results to the same integral constraint introduced by Roxburgh (1992). The systematic difference is due to how CBM values are observationally calibrated.…”

Section: Comparison With Observationssupporting

confidence: 60%

See 1 more Smart Citation

Modelling Time-dependent Convective Penetration in 1D Stellar Evolution

Johnston,

Michielsen,

Anders

et al. 2024

ApJ

View full text Add to dashboard Cite

One-dimensional stellar evolution calculations produce uncertain predictions for quantities like the age, core mass, core compactness, and nucleosynthetic yields; a key source of uncertainty is the modeling of interfaces between regions that are convectively stable and those that are not. Theoretical and numerical work has demonstrated that there should be numerous processes adjacent to the convective boundary that induce chemical and angular momentum transport, as well as modify the thermal structure of the star. One such process is called convective penetration, wherein vigorous convection extends beyond the nominal convective boundary and alters both the composition and thermal structure. In this work, we incorporate the process of convective penetration in stellar evolution calculations using the stellar evolution software instrument mesa. We implement convective penetration according to the description presented by Anders et al. to to calculate a grid of models from the pre-main sequence to helium core depletion. The extent of the convective penetration zone is self-consistently calculated at each time step without introducing new free parameters. We find both a substantial penetration zone in all models with a convective core and observable differences to global stellar properties such as the luminosity and radius. We present how the predicted radial extent of the penetration zone scales with the total stellar mass, age, and metallicity of the star. We discuss our results in the context of existing numerical and observational studies.

show abstract

Section: Comparison With Observationssupporting

confidence: 60%

“…1. Convective penetration is the extension of vigorous convection beyond the traditional convective boundary, causing the transport and mixing of both chemicals and heat (and therefore entropy; Shaviv & Salpeter 1973;Roxburgh 1978Roxburgh , 1989Zahn 1991;Roxburgh 1992;Viallet et al 2015;Baraffe et al 2023). 2.…”

Section: Convective Core Boundary Mixingmentioning

confidence: 99%