Diffraction-limited speckle masking interferometry of binary stars with the SAO 6-m telescope

M. Schöller, I.I. Balega, Y.Y. Balega, K.-H. Hofmann, T. Reinheimer and G. Weigelt

Pis'ma Astron. Zh. 24, 337-342 (1998), english translation in Astronomy Letters 24, 283-288 (1998)


Optical speckle masking observations of 32 binary and multiple stars with the SAO 6-m telescope are presented. The resolution of the reconstructed diffraction-limited images is 23 mas at 656 nm. Accurate magnitude differences were first determined for most binaries. The results for individual systems are compared with the available orbits and with published photometric data. A new close visual component was discovered in the multiple system ADS 784.

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Infrared Speckle Interferometry of Eleven Binaries Using a Bispectral Analysis

I.I. Balega, Y.Y. Balega, K.-H. Hofmann, and G. Weigelt

Astronomy Letters 27, 95-98 (2001)


Infrared speckle-masking observations of eleven binary systems with the 6-m Special Astrophysical Observatory telescope are presented. A resolution of 43 mas in J (1.25 µm) and 76 mas in K (2.2 µm) has been achieved in reconstructed images. Accurate magnitude differences, separations, and position angles have been determined for all the resolved binaries. The pair HR 1071 with an abnormally low lithium abundance is considered in more detail.

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Speckle interferometry of the spectroscopic binaries Gliese 150.2 and 41 Draconis

Balega, I. I.; Balega, Yu. Yu.; Falcke, H.; Osterbart, R.; Reinheimer, T.; Schöller, M.; Weigelt, G.

Astronomy Letters, v.23, No.2, p.172-176 (1997)


We present the first diffraction-limited, visible and infrared speckle masking observations of the nearby spectroscopic binaries Gl 150.2 and 41 Dra performed with the 6-m telescope. Gl 150.2 is a pair of K0 and M0 dwarfs with a magnitude difference of 2m.49 ± 0m.05 in the red. Its orbital period is close to ten years. A preliminary apparent orbit was derived for the pair 41 Dra with double-lined F7 V components from six speckle measurements. The masses of the components of 41 Dra determined with an error of ±16% are 1.26µ and 1.18µ. Their absolute magnitudes, Mabol = 2.92 and Mbbol = 3.30, place them 0m.8 above the main-sequence stars of the same spectral range.

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Orbits of new Hipparcos binaries. I*

I.I. Balega, Y.Y. Balega, K.-H. Hofmann, E.A. Pluzhnik, D. Schertl, Z.U. Shkhagosheva and G. Weigelt

Astronomy and Astrophysics, 433 (Issue 2), p.591-596 (2005)


We present first orbits for 6 new Hipparcos binaries. The orbits were determined from speckle interferometric measurements collected mailny at the 6 m BTA telescope of the Special Astropyhysical Observatory in Zelenchuk. Three of the systems, HIP 11352, HIP 14075 and HIP 14230, have late G- or early K-type components, while HIP 14669 = GJ 125, HIP 106972 = GJ 4210 and HIP 111685 = GJ 4287 have M-type components. The periods of the orbits are in the range of 6-28 years. Mass sums and their errors are derived for the systems. The Hipparcos parallax error is the dominating error source of the mass determination.

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Orbits of new Hipparcos binaries.II.

Balega, I.I., Balega, Y.Y., Hofmann, K.-H., Malogolovets, E.V., Schertl, D., Shkhagosheva, Z.U., Weigelt, G.

Astronomy & Astrophysics, 448, pg.703-707 (2006)


We continue the presentation of new orbits for Hipparcos binaries determined from regular speckle interferometric observations. Most of the data were collected in the period between 1998.77 and 2004.82 using the 6 m BTA telescope of the Special Astrophysical Observatory in Zelenchuk. New orbits are presented for six pairs: HIP 4809, HIP 4849, HIP 5531, HIP 105947, and HIP 114922. One of the pairs, HIP 114922, has M dwarf components orbiting with a period of 19.72 yr. Two binaries, HIP 4809 and HIP 5531, have luminosity class IV components. The periods of the orbits range from 7.30 yr to 28.99 yr. All of the orbits can be considered definitive; however, the total mass error for the systems remains high, mainly due to Hipparcos parallax error.

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