Constraining angular momentum transport processes in stellar interiors with red-giant stars in the open cluster NGC6819

TL;DR

This paper uses observations of red giants in NGC6819 to constrain stellar interior models, focusing on angular momentum transport and rotation effects, enhancing understanding of stellar evolution.

Contribution

It introduces evolutionary models incorporating rotation-induced mixing and compares theoretical oscillation frequencies with observations for NGC6819.

Findings

Constraints on angular momentum transport in stellar interiors

Improved models matching observed oscillation frequencies

Refined estimates of cluster age and stellar parameters

Abstract

Clusters are excellent test benches for verification and improvement of stellar evolution theory. The recent detection of solar-like oscillations in G-K giants in the open cluster NGC6819 with Kepler provides us with independent constraints on the masses and radii of stars on the red giant branch, as well as on the distance to clusters and their ages. We present, for NGC6819, evolutionary models by considering rotation-induced mixing ; and the theoretical low-l frequencies of our stellar models.