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Title: An improved method for the determination of the orbital parameters of a binary system that contains a pulsating component
Authors: MOLENBERGHS, Geert 
AERTS, Conny 
De Cat, Peter
Issue Date: 1999
Publisher: E D P SCIENCES
Source: Astronomy and Astrophysics Supplement Series, 135(2). p. 383-390
Abstract: In this paper we present a method to assign statistical weights to radial-velocity measurements of a binary system of which one of the components is a variable star. The basic idea of the method is to separate the radial-velocity changes due to the intrinsic variability from those due to the orbital motion. This can be achieved if part of the data set consists of good coverages of the intrinsic variability cycle. These full coverages are used to estimate the variability for the nights on which only one or a few spectra were obtained. Our technique is applicable when the intrinsic variability has a period that is considerably shorter than the orbital period. Once weights have been assigned, existing methods to derive the orbital parameters can be used with better accuracy compared to the case where all data points are treated as if no intrinsic variability were present (equal weights). We illustrate our method and compare the orbital solution obtained with and without assigning weights for three pulsating stars in a binary system: $\beta\,$Cru, $\varepsilon\,$Per, and $\kappa\,$Sco.
Keywords: methods; statistical — stars; oscillations — binaries; spectroscopic
Document URI:
DOI: 10.1051/aas:1999180
ISI #: 000078786300016
Rights: © European Southern Observatory (ESO), 1999
Type: Journal Contribution
Validations: ecoom 2000
Appears in Collections:Research publications

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