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Recognition of unresolved binaries on Gaia colour indexdiagrams

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
O. Malkov ,
A. Mironov  and
S. Sichevskij
O. Malkov
Affiliation:
Institute of Astronomy, Russian Acad. Sci., Russian. e-mail: [email protected] Faculty of Physics, Moscow State University, Russian
A. Mironov
Affiliation:
Sternberg Astronomical Institute, Moscow State University, Russian
S. Sichevskij
Affiliation:
Institute of Astronomy, Russian Acad. Sci., Russian. e-mail: [email protected]
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Abstract

Detection of a composite flux in Gaia photometry can serve as an indication of aphotometrically unresolved binarity and can allow us to contribute to the parameterizationof the components of binary systems. A main goal of the present study is to develop amethod of automatic photometric detection, based on theoretical stellar spectral energydistributions and general understanding of binary evolution.

The following procedure is applied to achieve the declared goal. One can compose possiblepairs of components, based on evolution concept, and using theoretical binary evolutionarytracks. This can be done for all stages of binary evolution, excluding perhaps the mostmarginal and rapid stages. Theoretical spectrophotometric spectral energy distributionsand response functions of Gaia photometric bands allows us to compute colour-indices ofsuch pairs, when they are unresolved, as well as of single stars. Usage of an interstellarextinction law gives us theoretical colour-indices of reddened objects, both single starsand unresolved binaries. When plotted on a multidimensional Gaia colour space, they allowus to indicate areas, where unresolved binaries can be easily separated from single stars.The procedure also indicates Gaia colour indices, suitable to distinguish those pairs fromsingle stars.

As an output of the procedure, a Gaia list of detected photometrically unresolvedbinaries with physical parameters can be compiled.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 409 - 412
Copyright
© EAS, EDP Sciences 2011

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References

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