Revisiting TW Hydrae in light of new astrometric data
| hal.structure.identifier | Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo] [IAG] | |
| dc.contributor.author | TEIXEIRA, R., | |
| hal.structure.identifier | M2A 2014 | |
| dc.contributor.author | DUCOURANT, C. | |
| dc.contributor.author | GALLI, P. A. B., | |
| hal.structure.identifier | M2A 2014 | |
| dc.contributor.author | LE CAMPION, J.-F. | |
| dc.contributor.author | ZUCKERMAN, B., | |
| dc.contributor.author | KRONE-MARTINS, A. G. O., | |
| dc.contributor.author | CHAUVIN, G., | |
| dc.contributor.author | SONG, I., | |
| dc.date.issued | 2014-10 | |
| dc.date.conference | 2013 | |
| dc.description.abstractEn | Our efforts in the present work focused mainly on refining and improving the previous description and understanding of the stellar association TW Hydrae (TWA) including a very detailed membership analysis and its dynamical and evolutionary age.To achieve our objectives in a fully reliable way we take advantage of our own astrometric measurements (Ducourant et al. 2013) performed with NTT/EFOSC2 - ESO (La Silla - Chile) spread over three years (2007 - 2010) and of those published in the literature.A very detailed membership analysis based on the convergent point strategy as developed by our team (Galli et al. 2012, 2013) allowed us to define a consistent kinematic group containing 31 stars among the 44 proposed as TWA member in the literature. Assuming that our sample of stars may be contaminated by non-members and to get rid of the particular influence of each star we applied a Jacknife resampling technique generating 2000 random lists of 13 stars taken from our 16 stars and calculated for each the epoch of convergence when the radius is minimum. The mean of the epochs obtained and the dispersion about the mean give a dynamical age of 7.5± 0.7 Myr for the association that is in good agreement with the previous traceback age (De La Reza et al. 2006). We also estimated age for TWA moving group members from pre-main sequence evolutionary models (Siess et al. 2000) and find a mean age of 7.4± 1.2 Myr. These results show that the dynamical age of the association obtained via the traceback technique and the average age derived from theoretical evolutionary models are in good agreement. | |
| dc.language.iso | en | |
| dc.source.title | Revista Mexicana de Astronomía y Astrofísica | |
| dc.title.en | Revisiting TW Hydrae in light of new astrometric data | |
| dc.type | Communication dans un congrès | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| bordeaux.page | 169 - 170 | |
| bordeaux.volume | 44 | |
| bordeaux.country | BR | |
| bordeaux.title.proceeding | Revista Mexicana de Astronomía y Astrofísica | |
| bordeaux.conference.city | Florianópolis | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01092381 | |
| hal.version | 1 | |
| hal.invited | non | |
| hal.proceedings | oui | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01092381v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=Revista%20Mexicana%20de%20Astronom%C3%ADa%20y%20Astrof%C3%ADsica&rft.date=2014-10&rft.volume=44&rft.spage=169%20-%20170&rft.epage=169%20-%20170&rft.au=TEIXEIRA,%20R.,&DUCOURANT,%20C.&GALLI,%20P.%20A.%20B.,&LE%20CAMPION,%20J.-F.&ZUCKERMAN,%20B.,&rft.genre=unknown |
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