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The Eclipsing Triple System U Ophiuchi Revisited

Published online by Cambridge University Press:  12 July 2007

Luiz Paulo R. Vaz ,
Johannes Andersen  and
Antônio Claret
Luiz Paulo R. Vaz
Affiliation:
Departamento de Física, ICEx, UFMG, Brazil email: lpv@fisica.ufmg.br
Johannes Andersen
Affiliation:
Niels Bohr Institute, Astronomical Observatory, Copenhagen, Denmark email: ja@astro.ku.dk Nordic Optical Telescope Scientific Association, E-38700 Santa Cruz de La Palma, Spain
Antônio Claret
Affiliation:
Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain email: claret@iaa.es
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Abstract

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We have redetermined the absolute dimensions of the mid B-type eclipsing binary U Oph from new light and radial-velocity curves, accounting for both the apsidal motion and the light-time orbit around the third star. The stars in U Oph have masses of 5.27 and 4.74 M⊙(±1.5%) and are located in the middle of the main-sequence band for an an age of ∼50 Myr. U Oph and three other systems (V760 Sco, MU, Cas and DI Her) all have components within 10% of 5M⊙ and ages below 100 Myr; we find significant heavy-element abundance differences between these young nearby stars.

Keywords

stars: binaries: close: eclipsing: evolution: individual (U Oph, MU Cas, V760 Sco, DI Her
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 109 - 110
Copyright
Copyright © International Astronomical Union 2007

References

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Vaz, L.P.R., Andersen, J., & Claret, A. 2007, A&A, in press (accepted March 29, 2007)Google Scholar
Supplementary material: PDF

Vaz2

Symposium poster

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