Inseok Song, Ben Zuckerman, Mike Bessell
We have spectroscopically identified ?about 100 G-, K- and M-type members of the Scorpius Centaurus complex. To deduce the age of these young stars we compare their Li ?6708 absorption line strengths against those of stars in the TW Hydrae association and ?beta Pictoris moving group. These line strengths indicate that Sco-Cen stars are younger than ?beta Pic stars whose ages of ?~12 Myr have previously been derived from a kinematic traceback analysis. Our derived age, ?~10Myr, for stars in the LCC and UCL subgroups of ScoCen is younger than previously published ages based on the moving cluster method and upper main sequence fitting. The discrepant ages are likely due to an incorrect (or lack of) cross-calibration between model-dependent and model-independent age-dating methods.
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http://arxiv.org/abs/1204.5715
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