Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 438, Issue 1, Pages L11-L15Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slt141
Keywords
stars: kinematics and dynamics; stars: late-type; stars: pre-main sequence; open clusters and associations: individual: Beta Pictoris; solar neighbourhood
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Funding
- European Union [312430]
- STFC
- STFC [ST/J000035/1, ST/G002355/1, ST/I005749/1, ST/J001384/1, PP/D000955/1, PP/F000057/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/F000057/1, ST/G002355/1, ST/J000035/1, ST/I005749/1, PP/D000955/1, ST/J001384/1] Funding Source: researchfish
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Optical spectroscopy is used to confirm membership for eight 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 6708 angstrom 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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