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

被引：179

作者：

Binks, A. S. ^{[1
]}

Jeffries, R. D. ^{[1
]}

机构：

[1] Keele Univ, Sch Chem & Phys, Astrophys Grp, Keele ST5 5BG, Staffs, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 438卷 / 01期

关键词：

stars: kinematics and dynamics; stars: late-type; stars: pre-main sequence; open clusters and associations: individual: Beta Pictoris; solar neighbourhood; LOW-MASS STARS; PLANET-FINDING CAMPAIGN; MAIN-SEQUENCE STARS; DEBRIS DISK; YOUNG STARS; SUBSTELLAR COMPANION; ASSOCIATIONS; CANDIDATES; CLUSTER; MEMBERS;

D O I：

10.1093/mnrasl/slt141

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：L11 / L15

页数：5

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