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Trigonometric parallaxes in the TW Hydrae Association

Published online by Cambridge University Press:  26 February 2013

C. Ducourant ,
R. Teixeira ,
G. Chauvin ,
A. Krone-Martins ,
J. F. Le Campion ,
P. Galli ,
I. Song  and
B. Zuckerman
C. Ducourant
Affiliation:
Observatoire Aquitain des Sciences de l'Univers, CNRS-UMR 5804, BP 89, 33270 Floirac, France email: [email protected]
R. Teixeira
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226 Cidade Universitária, 05508-900 São Paulo SP, Brazil
G. Chauvin
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, BP 53, F-38041 Grenoble Cédex 9, France
A. Krone-Martins
Affiliation:
SIM, Facultade de Ciencias da Universidade de Lisboa, Campo Grande, Edifício C1, gabinetes 1.4.21 e 1.4.39, P-1749-016 Lisbon, Portugal
J. F. Le Campion
Affiliation:
Observatoire Aquitain des Sciences de l'Univers, CNRS-UMR 5804, BP 89, 33270 Floirac, France email: [email protected]
P. Galli
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226 Cidade Universitária, 05508-900 São Paulo SP, Brazil
I. Song
Affiliation:
The University of Georgia, Athens, GA 30602, USA
B. Zuckerman
Affiliation:
University of California, Physics and Astronomy Building, 430 Portola Plaza, Box 951547, Los Angeles, CA 90095–1547, USA
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Abstract

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We have conducted a program of trigonometric distance measurements to 13 members of the TW Hydrae Association (TWA), which will enable us (through back-tracking methods) to derive a convincing estimate of the age of the association, independent of stellar evolutionary models. With age, distance, and luminosity known for an ensemble of TWA stars and brown dwarfs, models of early stellar evolution (which are still uncertain for young ages and substellar masses) will then be constrained by observations over a wide range of masses (0.025 to 0.7 M⊙).

Keywords

astrometrystars: distancesstars: kinematicsstars: low-massbrown dwarfsstars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 386 - 389
Copyright
Copyright © International Astronomical Union 2013

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