J/other/AstBu/67.44   Speckle interferometry of magnetic stars   (Balega+, 2012)
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Beginning of ReadMe : J/other/AstBu/67.44 Speckle interferometry of Ap stars (Balega+, 2012) ================================================================================ Speckle interferometry of magnetic stars with the BTA. I. First results. Balega Yu.Yu., Dyachenko V.V., Maksimov A.F., Malogolovets E.V., Rastegaev D.A., Romanyuk I.I. <<Astrophys. Bull., 67, 44 (2012)> =2012AstBu..67...44B ================================================================================ ADC_Keywords: Positional data ; Stars, Ap ; Stars, Bp ; Stars, peculiar ; Stars, A-type ; Stars, B-type ; Stars, double and multiple ; Interferometry Keywords: stars: magnetic - stars: binaries - methods: observational: speckle interferometry Abstract: We present the results of speckle interferometry of a sample of 117 chemically peculiar stars with global magnetic fields. The observations were made in December 2009 at the BTA with a spatial resolution of about 0.02 arcseconds in the visual spectral region. Twenty-nine stars were resolved into individual components, 14 of them for the first time (HD965, HD5797, HD8855, HD10783, HD16605, HD21699, HD35502, HD51418, HD64486, HD79158, HD103498, HD108651, HD213918, HD293764). In twelve cases a companion turned out to be 2-4 magnitudes fainter than the main component - a magnetic star. Young hot Bp stars HD35502 and HD213918 are exceptions, since their companions are fainter by about 1 magnitude. In all cases, the linear distance from a star to its companion at the epoch of observations in the picture plane exceeded 10^9^km. Eighty-eight magnetic CP stars revealed no secondary components within our study. Thus, the fraction of speckle interferometric binaries in our sample amounts to 25%. Description: The results of our measurements of 27 binary systems, resolved into components are presented in Table 1, where the stars are laid out in the ascending order by their Right Ascensions. The table columns contain the following data: the number of the star in the HD catalog, its number in the HIPPARCOS catalog, its WDS designation (2000.0 coordinates), the epoch of observations, companion's position angle theta and its error sigma_theta, the separation between the components rho and the error of this value sigma_rho in milliarcseconds (mas), the brightness difference between the components Deltam and the error of this value sigma_Deltam, the spectral range used lambda.

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