Commission 26: Double and Multiple Stars

Hartkopf, William I.; Allen, Christine; Davis, John; Fekel, Francis C.; Lampens, P.; Ling, J. F.; Oblak, E.; Oswalt, Terry D.; Scarfe, C. D.

doi:10.1017/s1743921306004546

Cited by 6 publications

(8 citation statements)

References 22 publications

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“…As in the case of KUI 23 AB, the measurement obtained from the power spectrum with diffuse fringes leads to a bad estimation of the position angle. The second measurement obtained with better conditions is fully compatible with the orbit of Hartkopf & Mason (2000). (iv) BU 1077, 11037+6145: the residuals in θ are large with the recent orbits of Soderhjelm (1999) and Aristidi et al (1999), for our two measurements.…”

Section: Comparison With Published Ephemeridessupporting

confidence: 62%

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

Scardia

Prieur

Sala

et al. 2005

Monthly Notices of the Royal Astronomical Society

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We present relative astrometric measurements of visual binaries made with the Pupil Interferometry Speckle camera and Coronagraph (PISCO) at the 1‐m Zeiss telescope of Brera Astronomical Observatory, in Merate. We provide 135 new observations of 103 objects, with angular separations in the range 0.1–4.0 arcsec and with an accuracy better than ∼0.01 arcsec. Our sample is made of 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. This work already leads to the revision of the orbits of three systems (ADS 5447, 8035 and 8739).

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Section: Comparison With Published Ephemeridessupporting

confidence: 62%

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

Scardia

Prieur

Sala

et al. 2005

Monthly Notices of the Royal Astronomical Society

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“…MCA 55Aac, ADS 12540: The preliminary orbit of Hartkopf (1999) does not represent our observation, which suggests a very different apparent orbit. We propose a new (although still preliminary) solution in Sect.…”

Section: Comparison With Published Ephemeridescontrasting

confidence: 60%

“…Our determination favours the old spectral classification of Bidelman and Bahng. Alternatively, the total systemic mass derived from Hartkopf's (1999) orbital elements is 35 M which is larger than all the values found in the literature, even for the most massive combination K3 III + B0 V of 22 M proposed by Staizys & Kuriliene (1981). Our orbit looks thus more satisfactory, but more observations are required to monitor a larger part of the orbit, to improve our knowledge of the orbital elements and refine the systemic mass determination.…”

Section: Wds 19307+2758 -Mca 55aac -Ads 12540mentioning

confidence: 55%

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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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“…The orbit by Hartkopf & Mason (2010) with P=145 yr, a=0.403, and e=0.287 gives a mass sum 2.4M ⊙ but places this star at π dyn =10.87 mas which is rather different than π Hip (3.74 ± 1.05 mas). We have calculated a 236.3 yr orbit ( Figure 6) that is almost two times greater with a rather elliptical (e=0.703) solution and a somewhat smaller semiaxis (a=0.321) that give a total mass of 3.1 M ⊙ (which is more reasonable for two A9+F1 stars) as well as π dyn =5.77 mas that is rather close to that of π Hip .…”

Section: Wds 11532-1540 (=A 2579)mentioning

confidence: 88%

Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using theHipparcosparallax

Docobo

Tamazian

Malkov

et al. 2016

Mon. Not. R. Astron. Soc.

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Improved orbits are presented for the visual binaries WDS 02366+1227, WDS 02434-6643, WDS 03244-1539, WDS 08507+1800, WDS 09128-6055, WDS 11532-1540, WDS 17375+2419, and WDS 22408-0333. The latest orbits for these binaries were demonstrating a great inconsistency between the systemic mass obtained through Kepler's Third Law and that calculated as a sum of their components' mass through standard mass-luminosity and mass-spectrum relationships. Our improvement allowed us to obtain consistent systemic masses for WDS 02434-6643 and WDS 09128-6055 without a need for changing the Hipparcos parallax. For the remaining 6 pairs, we suggest the use of their dynamical parallax as a reliable distance estimate unless more precise parallax is reported. Astrophysical and dynamical properties of individual objects are discussed.

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Commission 26: Double and Multiple Stars

Cited by 6 publications

References 22 publications

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

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

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

Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using theHipparcosparallax

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