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A revised age greater than 50 Myr for the young cluster IC 4665

Jeffries, Robin D; Jackson, Richard J; Binks, A S


Richard J Jackson

A S Binks


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.

Journal Article Type Article
Acceptance Date Sep 13, 2023
Online Publication Date Sep 18, 2023
Publication Date 2023-11
Deposit Date Oct 3, 2023
Publicly Available Date Oct 3, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 526
Issue 1
Pages 1260-1267
Keywords Space and Planetary Science, Astronomy and Astrophysics


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