Spectroscopic binaries as observed by the future Gaia space mission
Institut d’Astrophysique et de Géophysique, Université de Liège, Belgium
Institut d’Astrophysique et de Géophysique, Université de Liège, Belgium
Institut d’Astrophysique et de Géophysique, Université de Liège, Belgium
Institut d’Astrophysique et de Géophysique, Université de Liège, Belgium
Institut d’Astrophysique et de Géophysique, Université de Liège, Belgium
Abstract
The future Gaia satellite will observe a large number of stars through its three main channels: astrometric, photometric and, for the brightest stars, spectroscopic. The satellite is equipped with the RVS spectrograph, which will provide medium-resolution spectra over a small wavelength range. These spectra should allow us to identify stars exhibiting a composite spectrum, either because of a chance alignment or a true binarity. We discuss the various aspects related to the data treatment of the binary candidates and describe the algorithms that are intended to be included in the processing pipeline.