MONTAGE: AGB nucleosynthesis with full s-process calculations

TL;DR

MONTAGE is a new nucleosynthesis code that efficiently models s-process element production in stars by combining detailed and rapid calculations, enabling large-scale stellar and galactic chemical evolution studies.

Contribution

It introduces a hybrid approach for s-process nucleosynthesis modeling that improves computational efficiency while maintaining accuracy.

Findings

Provides s-process yields for a 3 solar mass, solar metallicity star.

Demonstrates the effectiveness of the hybrid computational approach.

Lays groundwork for extensive stellar model grids for galactic evolution.

Abstract

We present MONTAGE, a post-processing nucleosynthesis code that combines a traditional network for isotopes lighter than calcium with a rapid algorithm for calculating the s-process nucleosynthesis of the heavier isotopes. The separation of those parts of the network where only neutron-capture and beta-decay reactions are significant provides a substantial advantage in computational efficiency. We present the yields for a complete set of s-process isotopes for a 3 Mo, Z = 0.02 stellar model, as a demonstration of the utility of the approach. Future work will include a large grid of models suitable for use in calculations of Galactic chemical evolution.