Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..109v&link_type=abstract
Binary Stars as Critical Tools & Tests in Contemporary Astrophysics, Proceedings of IAU Symposium #240, held 22-25 August, 2006
Astronomy and Astrophysics
Astrophysics
Scientific paper
The absolute dimensions of the mid B-type eclipsing triple system U Oph were determined through a fully consistent analysis, taking into account both the exceptionally short period (˜21.2 yr) apsidal motion and both the third light and the light-time orbit around a tertiary star (period of 38.4 yr). A new ephemeris was determined with the exact method proposed by Lacy and 353 - 229 primary, 124 secondary - times of minimum (selected out of 482 - 312 primary and 170 secondary - times from the literature, many referring to the same minimum). A modified version of the Wilson-Devinney (WD) code, adapted to treat systems with apsidal motion and/or light-time orbit effect with arbitrary atmosphere models for the stellar fluxes, was used to simultaneously analyze the 4 light (uvby-Hbeta system, obtained with the Strömgren Automatic Telescope at ESO, La Silla, Chile) and the radial velocity curves (Coudé spectrograph at the ESO 1.5 m telescope), with both the least-squares and the SIMPLEX minimization methods. The derived absolute dimensions of U Oph and those of other 3 systems, whose components have similar masses, namely V760 Sco, MU Cas and DI Her, are used to control and compare the evolutionary models of the Padova Group and the ones by Claret, with the astrophysical quantities log g, log Teff, log M and the derived luminosities.
Andersen Johannes
Claret Antonio
Vaz Luiz Paulo Ribeiro
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