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TRIMOR - three-dimensional correlation technique to analyse multi-order spectra of triple stellar systems: application to HD 188753

Mazeh, T. ; Tsodikovich, Y. ; Segal, Y. ; Zucker, S. ; Eggenberger, A. ; Udry, S. ; Mayor, M.

In: Monthly Notices of the Royal Astronomical Society, 2009, vol. 399, no. 2, p. 906-913

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    Title
    • TRIMOR - three-dimensional correlation technique to analyse multi-order spectra of triple stellar systems: application to HD 188753
    Author
    • Mazeh, T.. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
    • Tsodikovich, Y.. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
    • Segal, Y.. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
    • Zucker, S.. Department of Geophysics and Planetary Sciences, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
    • Eggenberger, A.. Laboratoire d'Astrophysique de Grenoble, UMR 5571 CNRS/Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
    • Udry, S.. Observatoire de Genève, Universite de Geneve, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
    • Mayor, M.. Observatoire de Genève, Universite de Geneve, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:291461
    Summary
    This paper presents a new algorithm, trimor, to analyse multi-order spectra of triple systems. The algorithm is an extension of tricor, the three-dimensional correlation technique that derives the radial velocities of triple stellar systems from single-order spectra. The combined correlation derived from many orders enables the detection and the measurement of radial velocities of faint tertiary companions. The paper applied trimor to the already available spectra of HD 188753, a well-known triple system, yielding the radial velocities of the faintest star in the system. This rendered the close pair of the triple system a double-lined spectroscopic binary, which led to a precise mass ratio and an estimate of its inclination. The close-pair inclination is very close to the inclination of the wide orbit, consistent with the assertion that this triple system has a close to coplanar configuration