A new method based on Markov chains for deriving SB2 orbits directly from their spectra

B. Famaey; D. Pourbaix; F. Arenou; J.-B. Salomon; J.-L. Halbwachs; L. Tal-Or; P. Guillout; R. Ibata; T. Mazeh; Y. Lebreton

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arxiv 1210.0841 v1 pith:GVF2Z7S3 submitted 2012-10-02 astro-ph.SR astro-ph.GA

A new method based on Markov chains for deriving SB2 orbits directly from their spectra

J.-B. Salomon , R. Ibata , P. Guillout , J.-L. Halbwachs , F. Arenou , B. Famaey , Y. Lebreton , T. Mazeh

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D. Pourbaix L. Tal-Or

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We present a new method to derive orbital elements of double-lined spectroscopic binaries (SB2). The aim is to have accurate orbital parameters of a selection of SB2 in order to prepare the exploitation of astrometric Gaia observations. Combined with our results, they should allow one to measure the mass of each star with a precision of better than 1%. The new method presented here consists of using the spectra at all epochs simultaneously to derive the orbital elements without templates. It is based on a Markov chain including a new method for disentangling the spectra.

A new method based on Markov chains for deriving SB2 orbits directly from their spectra

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