2000/09/12 by R. D. Jeffries, Jeffries, R. D., T. Naylor +1
Computer Science · Economics, Econometrics and Finance · Environmental Science · Physics and Astronomy · #Astrophysics (astro-ph) #Complex Systems and Time Series Analysis #FOS: Physical sciences #Geochemistry and Geologic Mapping #Isotope Analysis in Ecology #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0009179
6 pages, to appear in - From Darkness to Light, ASP Conference Series, eds. T. Montmerle and Ph. Andre
arxiv created 2000/09/12 · openalex publication_date 2000/09/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We take a critical look at the lithium depletion boundary (LDB) technique that has recently been used to derive the ages of open clusters. We identify the sources of experimental and systematic error and show that the probable errors are larger by approximately a factor two than presently claimed in the literature. We then use the Pleiades LDB age and photometry in combination with evolutionary models to define empirical colour-Teff relations that can be applied to younger clusters. We find that these relationships DO NOT produce model isochrones that match the younger cluster data. We propose that this is due either to systematic problems in the evolutionary models or an age (gravity) sensitivity in the colour-Teff relation which is not present in published atmospheric models.