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Kinematic analysis and membership status of TWA22ABR

hal.structure.identifierInstituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo] [IAG]
dc.contributor.authorTEIXEIRA, R.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorDUCOURANT, C.
hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorCHAUVIN, G.
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorKRONE-MARTINS, A.
hal.structure.identifierLaboratoire de Planétologie de Grenoble [LPG]
dc.contributor.authorBONNEFOY, M.
dc.contributor.authorSONG, I.
dc.date.created2009
dc.date.issued2009
dc.identifier.issn0004-6361
dc.description.abstractEnTWA22 was initially regarded as a member of the TW Hydrae association (TWA). In addition to being one of the youngest (~8Myr) and nearest (~20pc) stars to Earth, TWA22 has proven to be very interesting after being resolved as a tight, very low-mass binary. This binary can serve as a very useful dynamical calibrator for pre-main sequence evolutionary models. However, its membership in the TWA has been recently questioned despite due to the lack of accurate kinematic measurements. Based on proper motion, radial velocity, and trigonometric parallax measurements, we aim here to re-analyze the membership of TWA22 to young, nearby associations. Using the ESO NTT/SUSI2 telescope, we observed TWA22AB during 5 different observing runs over 1.2 years to measure its trigonometric parallax and proper motion. This is a part of a larger project measuring trigonometric parallaxes and proper motions of most known TWA members at a sub-milliarcsec level. HARPS at the ESO 3.6m telescope was also used to measure the system's radial velocity over 2 years. We report an absolute trigonometric parallax of TWA22AB, 57.0mas, corresponding to a distance 17.5pc from Earth. Measured proper motions of TWA22AB are -175.8mas/yr in right ascension and -21.3mas/yr in declination. Finally, from HARPS measurements, we obtain a radial velocity 14.8km/s.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrometry: trigonometric parallaxes
dc.subject.enTechniques: radial velocities
dc.subject.enStars: binaries
dc.subject.enfundamental parameters
dc.subject.enGalaxy: open cluster and association
dc.subject.endistances
dc.title.enKinematic analysis and membership status of TWA22ABR
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/200912173
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
dc.identifier.arxiv0906.4100
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page281-285
bordeaux.volume503
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-00398404
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00398404v1
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