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

Дата и время публикации : 2013-10-09T20:00:24Z

Авторы публикации и институты :
A. S Binks (Keele University, UK)
R. D. Jeffries (Keele University, UK)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Accepted for MNRAS Letters
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: 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.

Category: Physics