GASTAG evolutionary tracks and isochrones from coupled 1D and 3D models

GASTAG (GARSTEC + Stagger) provides stellar evolutionary tracks and isochrones constructed using a novel 1D-3D coupling approach, combining the 1D stellar evolution code GARSTEC with mean 3D near-surface structures from the Stagger-grid. This coupling makes predicted stellar properties effectively independent of the mixing-length parameter and provides improved surface boundary conditions compared to classical 1D models.

The dataset covers a metallicity range of [Fe/H] = −1.90 to +0.40 for low-mass stars.

Relevant paper:

GASTAG evolutionary tracks and isochrones from coupled 1D and 3D models: systematic temperature offsets in red giants, Yixiao Zhou, Jiaqi (Martin) Ying, Yaguang Li, and Luca Casagrande, A&A, in review

Note: due to space limit, stellar structural models (fgong files) and oscillation frequencies are not included in the Zenodo version. The full dataset is available in NIRD Research Data Archive (DOI: 10.11582/2026.h8444rio). Link here:

https://data.archive.sigma2.no/dataset/gastag