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- W3102047536 abstract "A sample of 14 pre-main sequence visual binary systems in southern star-forming regions were imaged at 2 um with the Keck I telescope to search for tertiary companions, scattered-light disks, and compact nebulae at linear scales of 5-100 AU. Speckle holography was used to produce images with diffraction-limited resolution and high dynamic range, and photometry in four filters between J (1.25 um) and L' (3.8 um) was used to provide a diagnostic of the infrared excess. Of the 14 visual binary systems studied, 9 contain components which show evidence for resolved structure. Two of them (WSB 18 and B59-1) have well-resolved tertiary companions separated from the primary stars by ~100 mas. The remainder are only marginally resolved at the diffraction limit of the telescope. Sz 116, AS 205, Elias 2-22, ESO H alpha 282, and B59-2 each have one component which is marginally-resolved along one axis and unresolved on the perpendicular axis, consistent with tertiaries at separations between ~6 and 40 mas. If all of these systems are hierarchical triples, then fully half of the nominal binaries in the sample are triple. The primaries in Elias 2-49 and WSB 71 are marginally resolved along all position angles, suggesting the presence of dust halos. No disks were unambiguously detected in the sample." @default.
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- W3102047536 date "2002-08-01" @default.
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- W3102047536 title "Imaging the Circumstellar Environments of Young Binaries in Southern Star-Forming Regions" @default.
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- W3102047536 doi "https://doi.org/10.1086/341386" @default.
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