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Title: Orbital parameters, masses and distance to beta Centauri determined with the Sydney University Stellar Interferometer and high-resolution spectroscopy
Authors: Davis, J
Mendez, A
Seneta, EB
Tango, WJ
Booth, AJ
O'Byrne, JW
Thorvaldson, ED
Ausseloos, Mario
Aerts, Conny
Uytterhoeven, K #
Issue Date: Feb-2005
Publisher: Blackwell publishing ltd
Series Title: Monthly notices of the royal astronomical society vol:356 issue:4 pages:1362-1370
Abstract: The bright southern binary star beta Centauri (HR 5267) has been observed with the Sydney University Stellar Interferometer (SUSI) and spectroscopically with the European Southern Observatory Coude Auxiliary Telescope and Swiss Euler telescope at La Silla. The interferometric observations have confirmed the binary nature of the primary component and have enabled the determination of the orbital parameters of the system. At the observing wavelength of 442 nm the two components of the primary system have a magnitude difference of 0.15 +/- 0.02. The combination of interferometric and spectroscopic data gives the following results: orbital period 357.00 +/- 0.07 d, semimajor axis 25.30 +/- 0.19 mas, inclination 67.degrees4 +/- 0.degrees3, eccentricity 0.821 +/- 0.003, distance 102.3 +/- 1.7 pc, primary and secondary masses M-1 = M-2 = 9.1 +/- 0.3 M-circle dot and absolute visual magnitudes of the primary and secondary M-1V = -3.85 +/- 0.05 and M-2V = 3.70 +/- 0.05, respectively. The high degree of accuracy of the results offers a fruitful starting point for future asteroseismic modelling of the pulsating binary components.
ISSN: 0035-8711
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
# (joint) last author

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