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arxiv: 1310.2613 · v1 · pith:Q33NVSIInew · submitted 2013-10-09 · 🌌 astro-ph.SR

A lithium depletion boundary age of 21 Myr for the Beta Pictoris moving group

A.S Binks , R.D. Jeffries (Keele University , UK) This is my paper
classification 🌌 astro-ph.SR
keywords bpmggroupbetaboundarydepletionlithiumlow-massmembers
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Optical spectroscopy is used to confirm membership for 8 low-mass candidates in the young Beta Pic moving group (BPMG) via their radial velocities, chromospheric activity and kinematic parallaxes. We searched for the presence of the Li I 6708A resonance feature and combined the results with literature measurements of other BPMG members to find the age-dependent lithium depletion boundary (LDB) -- the luminosity at which Li remains unburned in a coeval group. The LDB age of the BPMG is 21 +/- 4 Myr and insensitive to the choice of low-mass evolutionary models. This age is more precise, likely to be more accurate, and much older than that commonly assumed for the BPMG. As a result, substellar and planetary companions of BPMG members will be more massive than previously thought.

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