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Astron. Astrophys. 331, 167-170 (1998)

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Research Note

A critique of disentangling as a method of deriving spectroscopic orbits

R.I. Hynes and P.F.L. Maxted

Astronomy Centre, University of Sussex, Falmer, Brighton, BN1 9QH, UK

Received 20 May 1997 / Accepted 20 October 1997


Multiple sets of synthetic spectra of OB-binary stars are used to test the suitability of disentangling for deriving accurate spectroscopic orbits. Given a set of spectra with broad phase coverage and sufficient total integration time (almost independent of the number of spectra), it appears that disentangling yields accurate and reliable semi-amplitudes of the spectroscopic orbits (other parameters being fixed). Methods for estimating the uncertainties on the derived semi-amplitudes are investigated.

Key words: binaries: spectroscopic – stars: fundamental parameters – techniques: radial velocities

Present address: Astronomy Group, University of Southampton, Highfield, Southampton, SO17 1BJ, UK

Send offprint requests to: R.I. Hynes (e-mail: rih@star.cpes.susx.ac.uk)

© European Southern Observatory (ESO) 1998

Online publication: February 4, 1998