A revised age greater than 50 Myr for the young cluster IC 4665
Abstract
IC 4665 is one of only a dozen young open clusters with a ``lithium depletion boundary" (LDB) age. Using an astrometrically and spectroscopically filtered sample of cluster members, we show that both the positions of its low mass stars in Gaia absolute colour-magnitude diagrams and the lithium depletion seen among its K- and early M-stars are discordant with the reported LDB age of (32 +4/-5) Myr. Re-analysis of archival spectra suggests that the LDB of IC 4665 has not been detected and that the published LDB age should be interpreted as a lower limit. Empirical comparisons with similar datasets from other young clusters with better-established LDB ages indicate that IC 4665 is bracketed in age by the clusters IC 2602 and IC 2391 at (55 +/- 3) Myr.
Keywords
Cite
@article{arxiv.2309.07619,
title = {A revised age greater than 50 Myr for the young cluster IC 4665},
author = {R. D. Jeffries and R. J. Jackson and A. S. Binks},
journal= {arXiv preprint arXiv:2309.07619},
year = {2023}
}
Comments
For publication in MNRAS, accepted version