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Membership status of TWA22AB

Published online by Cambridge University Press:  18 January 2010

Ramachrisna Teixeira ,
Christine Ducourant ,
Gael Chauvin ,
Alberto G. O. Krone–Martins ,
Mickael Bonnefoy  and
Inseok Song
Ramachrisna Teixeira
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, São Paulo, Brazil email: teixeira@astro.iag.usp.br
Christine Ducourant
Affiliation:
Laboratoire d'Astrophysique de Bordeaux, Université de Bordeaux I, France
Gael Chauvin
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, France
Alberto G. O. Krone–Martins
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, São Paulo, Brazil email: teixeira@astro.iag.usp.br
Mickael Bonnefoy
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, France
Inseok Song
Affiliation:
Department of Physics & Astronomy, University of Georgia, GAUSA
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Abstract

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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.

Keywords

stars: distancesopen clusters and associations: generalstars: individual (TWA22AB)binaries: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 540 - 543
Copyright
Copyright © International Astronomical Union 2010

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