Automatic Parametrization of Gaia Astrometrically Unresolved Binary Stars

Details Automatic Parametrization of Gaia Astrometrically Unresolved Binary Stars Automatic Parametrization of Gaia Astrometrically Unresolved Binary Stars

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..441k&link_type=abstract

"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me

Computer Science

Performance

1

Gaia, Parametrization, Binary Stars

Scientific paper

We have simulated 1X photometry of spectroscopic binary stars as they will be observed by Gaia to test how well the stellar physical parameters (Teff1 , Teff2 , log g1, log g2 and [Fe/H] in addition to extinction AV ) can be determined from such unresolved objects. Both single shot (SS) and end-of-mission (EM) data was analysed and the results compared to those for single stars. We find that the parametrization performance is a strong function of the logarithmic luminosity ratio log(Lr) and also depends on the underlying grid of stellar parameter combinations. The primary star's Teff1 and log g1 are parametrized at a similar precision as for a single star. The same applies to [Fe/H] and AV , the two systemic parameters.

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