Trigonometric parallaxes in the TW Hydrae Association

C. Ducourant (1) , R. Teixeira (2) , G. Chauvin , A. Krone-Martins , J.-F. Le Campion (1) , P. Galli , I. Song , B. Zuckerman

1 M2A 2013
2 IAG - Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo]

We have conducted a program of trigonometric distance measurements to 13 members of the TW Hydrae Association (TWA), which will enable us (through back-tracking methods) to derive a convincing estimate of the age of the association, independent of stellar evolutionary models. With age, distance, and luminosity known for an ensemble of TWA stars and brown dwarfs, models of early stellar evolution (which are still uncertain for young ages and substellar masses) will then be constrained by observations over a wide range of masses (0.025 to 0.7 M⊙).

Mots clés: astrometry; stars: distances; stars: kinematics; stars: low-mass; brown dwarfs; stars: evolution

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]; Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

C. Ducourant, R. Teixeira, G. Chauvin, A. Krone-Martins, J.-F. Le Campion, et al.. Trigonometric parallaxes in the TW Hydrae Association. Advancing the Physics of Cosmic Distances, 2012, beijing, China. pp.386-389, ⟨10.1017/S1743921312021771⟩. ⟨hal-00832241⟩