Improved implementation of dust-driven winds and dust formation in models of AGB evolution: Effects of pulsation and gas-pressure forcing

TL;DR

This paper presents an improved mean-flow model for dust-driven winds and dust formation in AGB stars, incorporating effects of pulsation and gas-pressure forcing to enhance stellar evolution simulations.

Contribution

It introduces a new mean-flow model that accounts for pulsation and gas-pressure effects, improving the physical realism of dust-driven wind modeling in AGB star evolution.

Findings

Enhanced dust formation modeling in AGB stars.

Better representation of pulsation effects in stellar wind models.

Improved accuracy in stellar evolution predictions.

Abstract

Mass loss is a crucial component in stellar evolution models, since it largely determines the rate of evolution at the later stages of a star's life. The dust-driven outflows from AGB stars are particularly important in this regard. Including AGB dust formation in a stellar evolution model does also require a model of these outflows. Since AGB stars exhibit large-amplitude pulsation, a model based on time-dependent radiation hydrodynamics (RHD) is needed in order to capture all the important physical aspects of dust formation. However, this cannot be afforded in a stellar evolution model. Here, a mean-flow model is presented, which include corrections to the steady-state model currently being used in AGB evolution models with dust formation.