Imaging survey of subsystems in secondary components to nearby southern dwarfs
arXiv:1407.6045 · doi:10.1088/0004-6256/148/4/72
Abstract
To improve the statistics of hierarchical multiplicity, secondary components of wide nearby binaries with solar-type primaries were surveyed at the SOAR telescope for evaluating the frequency of subsystems. Images of 17 faint secondaries were obtained with the SOAR Adaptive Module that improved the seeing; one new 0.2" binary was detected. For all targets, photometry in the g', i', z' bands is given. Another 46 secondaries were observed by speckle interferometry, resolving 7 close subsystems. Adding literature data, the binarity of 95 secondary components is evaluated. We found that the detection-corrected frequency of secondary subsystems with periods in the well-surveyed range from 10^3 to 10^5 days is 0.21+-0.06, same as the normal frequency of such binaries among solar-type stars, 0.18. This indicates that wide binaries are unlikely to be produced by dynamical evolution of N-body systems, but are rather formed by fragmentation.
Accepted by the Astronomical Journal; 7 pages, 7 figures
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Cited by in corpus (5)
- SOAR Adaptive Module (SAM): seeing improvement with a UV laser
- The Magellan PFS Planet Search Program: Radial Velocity and Stellar Abundance Analyses of the 360 AU, Metal-Poor Binary "Twins" HD 133131A & B
- Speckle interferometry of secondary components in nearby visual binaries
- New binaries in the epsilon Cha association
- Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using the Hipparcos parallax