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The Lithium Depletion Boundary (LDB) is a robust method for accuratelydetermining the ages of young clusters, but most pre-main-sequence models usedto derive LDB ages do not include the effects of magnetic activity on stellarproperties. In light of this, we present results from our spectroscopic studyof the very low-mass members of the southern open cluster Blanco 1 using theGemini-North telescope, program IDs: GN-2009B-Q-53 and GN-2010B-Q-96. Weobtained GMOS spectra at intermediate resolution for cluster candidate memberswith $I$$\approx$13--20 mag. From our sample of 43 spectra, we find 14 probablecluster members by considering proximity to the cluster sequence in an$I/I-K\rm_s$ color-magnitude diagram, agreement with the cluster's systemicradial velocity, and magnetic activity as a youth indicator. We systematicallyanalyze the H$\alpha$ and Li features and update the LDB age of Blanco 1 to be$126^{+13}_{-14}$ Myr. Our new LDB age for Blanco 1 shows remarkable coevalitywith the benchmark Pleiades open cluster. Using available empirical activitycorrections, we investigate the effects of magnetic activity on the LDB age ofBlanco 1. Accounting for activity, we infer a corrected LDB age of$114^{+9}_{-10}$ Myr. This work demonstrates the importance of accounting formagnetic activity on LDB inferred stellar ages, suggesting the need tore-investigate previous LDB age determinations.

An Improved Determination of the Lithium Depletion Boundary Age of Blanco 1 and a First Look on the Effects of Magnetic Activity