Isochronal age scale of young moving groups in the solar neighbourhood

TL;DR

This paper establishes a consistent age scale for young nearby moving groups using semi-empirical models, aligning with recent lithium depletion boundary ages, and aiding studies of stellar evolution and exoplanet environments.

Contribution

It introduces a self-consistent isochronal age scale for young moving groups based on semi-empirical models calibrated with observed stellar data.

Findings

Age scale aligns with lithium depletion boundary ages

Provides absolute ages for groups within 200 Myr

Supports studies of early stellar evolution and exoplanets

Abstract

We present a self-consistent, absolute isochronal age scale for young (< 200 Myr), nearby (< 100 pc) moving groups, which is consistent with recent lithium depletion boundary ages for both the Beta Pic and Tucana-Horologium moving groups. This age scale was derived using a set of semi-empirical pre-main-sequence model isochrones that incorporate an empirical colour-Teff relation and bolometric corrections based on the observed colours of Pleiades members, with theoretical corrections for the dependence on log g. Absolute ages for young, nearby groups are vital as these regions play a crucial role in our understanding of the early evolution of low- and intermediate-mass stars, as well as providing ideal targets for direct imaging and other measurements of dusty debris discs, substellar objects and, of course, extrasolar planets.