Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme

Details Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme

2007-11-13

arxiv.org/abs/0711.2091v1

AIP Conf.Proc.990:300-308,2008

Astronomy and Astrophysics

Astrophysics

Proceedings paper of First Stars III, 2006, Santa Fe, contributions by Falk Herwig and Paul Woodward, to appear in AIP Conf. S

Scientific paper

10.1063/1.2905567

The evolution of the first generations of stars at zero or extremly low metallicity, and especially some crucial properties like the primary N14 production, is charactarized by convective-reactive mixing events that are mostly absent from similar evolution phases at solar-like metallicity. These episodes occur when unprocessed H-rich material is mixed accross a convective boundary into C12 rich He-burning material, as for example in He-shell flashes of extremely-low metallicity AGB stars. In this paper we describe the astrophysical context of such convective-reactive events, including the difficulty of current one-dimensional stellar evolution models to correctly simulate these evolutionary phases. We then describe the requirements and current state of modeling convective-reactive processes in the first stars environment. We demonstrate some of the new concepts that we are applying to this problem, i.e. the highly accurate PPB advection scheme in the framework of PPM hydrodynamic simulations of mixing accross a very stiff convective boundary. We show initial results of such simulations that address the first non-reactive step of this problem, which is the entrainment of H at the top boundary of the He-shell flash convection zone.

Affiliated with

Also associated with

No associations

Rating

Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-529881