Is the Sun a Double Star?

Argyle, Bob

doi:10.1007/1-85233-860-1_6

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…• 1). A recent observation by Argyle (2002) agrees with the wider separation obtained with PISCO. Although the orbit of Popovic and Olevic was published recently, the 863-yr period is based on observations from 1953 to 1993 which define an arc of only 5 • : it is therefore largely unconstrained.…”

Section: Comparison With Published Ephemeridessupporting

confidence: 89%

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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Section: Comparison With Published Ephemeridessupporting

confidence: 89%

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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“…STF 2909, ADS 15971: It is a well-observed object with 1179 observations extending over nearly 230 yr. Independent observations with the Cambridge 8-inch refractor by RWA in 2005 (Argyle 2006) confirm the PISCO large residuals. Surprisingly, the old orbit published by Heintz (1984, with P = 760 yr) gives smaller angular residuals than that of Olevic & Cvetkovic (2004).…”

Section: Comparison With Published Ephemeridesmentioning

confidence: 77%

Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005

et al. 2008

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International audienceWe present relative astrometric measurements of visual binaries made during the second semester of 2005, with the speckle camera 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. The purpose of this long term program is to improve the accuracy of the orbits and determine the masses of the components.\ We performed 130 new observations of 120 objects, with most of the angular separations in the range 0\farcs1-4\arcsec, and with an average accuracy of 0\farcs01. Most of the position angles could be determined without the usual 180° ambiguity with the application of triple-correlation techniques, and their mean error is 0\fdg8. We have found a possible new triple system: ADS 11077. ?kip0.15cm The measurements of the closest binaries were made with a new data reduction procedure, based on model fitting of the background of the auto-correlations. As this procedure proved to be very efficient, we have re-processed the old observations of close binaries made with PISCO in Merate since 2004. We thus improved 20 measurements already published and obtained 7 new measurements for observations that were previously reported as ``unresolved".\ We finally present revised orbits for ADS 684, MCA 55Aac (in the Beta 1 Cyg-Albireo multiple system) and ADS 14783 for which the previously published orbits led to large residuals with our measurements and for which the new observations made since their computation allowed a significant improvement of those old orbits. The sum of the masses that we derived for those systems are consistent with the spectral type of the stars and the dynamic parallaxes are in good agreement with the parallaxes measured by Hipparcos

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Is the Sun a Double Star?

Cited by 2 publications

References 5 publications

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

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

Speckle observations with PISCO in Merate: IV. Astrometric measurements of visual binaries in 2005

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