Journal Article

Orbit determination of close binary systems using lucky imaging

F. M. Rica, R. Barrena, G. Vázquez, J. A. Henríquez and F. Hernández

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 1, pages 197-210
Published in print January 2012 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI:
Orbit determination of close binary systems using lucky imaging

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We present relative positions of visual binaries observed in 2009 with the FastCam ‘lucky-imaging’ camera mounted on the 1.5-m Carlos Sánchez Telescope at the Observatorio del Teide. We obtained 424 CCD observations (averaged in 198 mean relative positions) of 157 binaries with angular separations in the range 0.14–15.40 arcsec, with a median separation of 0.51 arcsec. For a given system, each CCD image represents the sum of the best 10–25 per cent images from 1000–5000 short-exposure frames. Derived internal errors were 7 mas in ρ and 1°.2 (9 mas) in θ. When comparing to systems with very well known orbits, we find that the rms deviation in ρ residuals is 23 mas, while the rms deviation in θ residuals is 0°.73/ρ. We confirmed 18 Hipparcos binaries and we report new companions to BVD 36 A and J 621 B. For binaries with preliminary orbital parameters, the relative radial velocity was estimated as well. We also present four new revised orbits computed for LDS 873, BU 627 A-BC, BU 628 and HO 197 AB. This work discusses the first results on visual binaries using the FastCam lucky-imaging camera.

Keywords: techniques: high angular resolution; astrometry; binaries: general; binaries: visual

Journal Article.  8935 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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