Membership status of TWA22AB

Ramachrisna Teixeira , C. Ducourant (1, 2, 3, 4) , Gael Chauvin (5) , A. Krone-Martins (1, 2, 3, 4) , Mickael Bonnefoy , Inseok Song

1 OASU - Observatoire aquitain des sciences de l'univers
2 L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux
3 LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
4 UB - Université Sciences et Technologies - Bordeaux 1
5 LAOG - Laboratoire d'Astrophysique de Grenoble

Using the ESO NTT/SUSI2 telescope, we observed TWA22AB during five different observing runs over 1.2 years to measure its trigonometric parallax and proper motion. HARPS at the ESO 3.6m telescope was also used to measure the system's radial velocity over 2 years. Based on trigonometric-parallax, proper-motion and radial-velocity measurements, we re-analyzed the membership of TWA22AB of the young, nearby associations TW Hydrae, β Pictoris and Tucana–Horologium.

Mots clés: stars: distances; open clusters and associations: general; stars: individual (TWA22AB); binaries: general

Domaines: Astrophysique stellaire et solaire [astro-ph.SR]; Astrophysique stellaire et solaire [astro-ph.SR]

Ramachrisna Teixeira, C. Ducourant, Gael Chauvin, A. Krone-Martins, Mickael Bonnefoy, et al.. Membership status of TWA22AB. Proceedings of the International Astronomical Union - Rio de janeiro : Brésil (2009), Star clusters: basic galactic building blocks throughout time and space, IAU Symposium, Volume 266, p. 540-543 - 2010IAUS.266.540T, 2010, Rio de janeiro, Brazil. pp.540-543, ⟨10.1017/S1743921309992006⟩. ⟨hal-00460490⟩