The Orbital Elements of a Visual Binary Star

Alzner, A.

doi:10.1007/1-85233-860-1_7

Cited by 4 publications

(3 citation statements)

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“…This is surprising since those two orbits are recent. Alzner (2008) also reported position angle and separation values similar to ours, for the same epoch (2007.3). Mason's orbits clearly need to be revised.…”

Section: Astrometric Measurementssupporting

confidence: 86%

Speckle observations with PISCO in Merate - VII. Astrometric measurements of visual binaries in 2007

Prieur

Scardia

Pansecchi

et al. 2009

Monthly Notices of the Royal Astronomical Society

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International audienceWe present relative astrometric measurements of visual binaries made during the first semester of 2007, with the Pupil Interferometry Speckle camera and COronagraph (PISCO) at the 102-cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Our sample contains orbital couples as well as binaries whose motion is still uncertain. We obtained 226 new measurements of 214 objects, with angular separations in the range 0.15-4.5 arcsec, and an average accuracy of 0.013 arcsec. The mean error on the position angles is . Most of the position angles could be determined without the usual 180° ambiguity with the application of triple-correlation techniques and/or by inspection of the long integration files. We also present the new orbits we have computed for ADS 7871, 7982 and 8128, for which our measurements lead to large residuals and/or for which the revision is justified by the significant number of observations made since the publication of the previous orbit

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Section: Astrometric Measurementssupporting

confidence: 86%

Speckle observations with PISCO in Merate - VII. Astrometric measurements of visual binaries in 2007

Prieur

Scardia

Pansecchi

et al. 2009

Monthly Notices of the Royal Astronomical Society

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“…On the contrary, we did not resolve ADS 14783 although the expected separation is 0.38 arcsec, which is large enough to be detected, if the orbit proposed by Söderhjelm (1999) is valid. Note that this discrepancy has been confirmed by Alzner (2005) who also found this star single with a 32.5‐cm aperture, in 2004. Clearly, more observations are needed for this object.…”

Section: Astrometric Measurementsmentioning

confidence: 76%

Speckle observations with PISCO in Merate - II. Astrometric measurements of visual binaries in 2004

Scardia¹,

Prieur²,

Pansecchi³

et al. 2006

Monthly Notices of the Royal Astronomical Society

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International audienceWe present relative astrometric measurements of visual binaries taken during the second semester of 2004 with the Pupil Interferometry Speckle camera and Coronagraph (PISCO) at the 1-m Zeiss telescope of the Brera Astronomical Observatory, in Merate, Italy. We performed 207 new observations of 194 objects with angular separations in the range 0.1-4.0 arcsec and an accuracy better than ~0.01 arcsec. Our sample contains orbital couples as well as binaries whose motion is still uncertain. Our purpose is to improve the accuracy of the orbits and constrain the masses of the components. Those measurements show that the orbit of ADS 15115 needs to be revised; we propose a new orbit for this object

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“… Notes . (a): in 2010.0646 (2753 and 0.326 arcsec; unpublished measurement), we could resolve it with the same instrumental setup as used in this work; (b): at the limit of the instrumentation; (c): angular separation smaller than the diffraction limit; (d): at the moment of observation, the ephemerides for the orbit of Cvetkovic (2010) are 1518 and 0.20 arcsec; (e): not resolved by Couteau (1988) and Alzner (2003, 2005, 2008); (f): it should be resolved with the instrument used; and (g): ephemerides from the orbit of Zulevic (1984) give 3461 and 0.239 arcsec (2009.9082). …”

Section: Resultsmentioning

confidence: 96%

Orbit determination of close binary systems using lucky imaging

Rica¹,

Barrena²,

Vázquez³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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We present relative positions of visual binaries observed in 2009 with the FastCam 'luckyimaging' 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.

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The Orbital Elements of a Visual Binary Star

Cited by 4 publications

References 0 publications

Speckle observations with PISCO in Merate - VII. Astrometric measurements of visual binaries in 2007

Speckle observations with PISCO in Merate - VII. Astrometric measurements of visual binaries in 2007

Speckle observations with PISCO in Merate - II. Astrometric measurements of visual binaries in 2004

Orbit determination of close binary systems using lucky imaging

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