Kinematic analysis and membership status of TWA22ABR
hal.structure.identifier | Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo] [IAG] | |
dc.contributor.author | TEIXEIRA, R. | |
hal.structure.identifier | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB] | |
hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
dc.contributor.author | DUCOURANT, C. | |
hal.structure.identifier | Laboratoire d'Astrophysique de Grenoble [LAOG] | |
dc.contributor.author | CHAUVIN, G. | |
hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
dc.contributor.author | KRONE-MARTINS, A. | |
hal.structure.identifier | Laboratoire de Planétologie de Grenoble [LPG] | |
dc.contributor.author | BONNEFOY, M. | |
dc.contributor.author | SONG, I. | |
dc.date.created | 2009 | |
dc.date.issued | 2009 | |
dc.identifier.issn | 0004-6361 | |
dc.description.abstractEn | TWA22 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.iso | en | |
dc.publisher | EDP Sciences | |
dc.subject.en | Astrometry: trigonometric parallaxes | |
dc.subject.en | Techniques: radial velocities | |
dc.subject.en | Stars: binaries | |
dc.subject.en | fundamental parameters | |
dc.subject.en | Galaxy: open cluster and association | |
dc.subject.en | distances | |
dc.title.en | Kinematic analysis and membership status of TWA22ABR | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1051/0004-6361/200912173 | |
dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR] | |
dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM] | |
dc.identifier.arxiv | 0906.4100 | |
bordeaux.journal | Astronomy and Astrophysics - A&A | |
bordeaux.page | 281-285 | |
bordeaux.volume | 503 | |
bordeaux.issue | 1 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-00398404 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-00398404v1 | |
bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2009&rft.volume=503&rft.issue=1&rft.spage=281-285&rft.epage=281-285&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=TEIXEIRA,%20R.&DUCOURANT,%20C.&CHAUVIN,%20G.&KRONE-MARTINS,%20A.&BONNEFOY,%20M.&rft.genre=article |
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