Speckle interferometry at SOAR in 2015

Abstract

The results of speckle interferometric observations at the SOAR telescope in 2015 are given, totalling 1303 measurements of 924 resolved binary and multiple stars and non-resolutions of 260 targets. The separations range from 12 mas to 3.37" (median 0.17"); the maximum measured magnitude difference is 6.7 mag. We resolved 27 pairs for the first time, including 10 as inner or outer subsystems in previously known binaries, e.g. the 50-mas pair in Epsilon Cha. Newly resolved pairs are commented upon. We discuss three apparently non-hierarchical systems discovered in this series, arguing that their unusual configuration results from projection. The resolved quadruple system HIP 71510 is studied as well.

10 pages, 8 figures. Accepted for publication in AJ. The online tables are not included, available from Tokovinin on request. arXiv admin note: text overlap with arXiv:1506.05718

References in corpus (17)

• Validation of the new Hipparcos reduction
• The Dartmouth Stellar Evolution Database
• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• Speckle interferometry at the Blanco and SOAR telescopes in 2008 and 2009
• Debris disks in main sequence binary systems
• Speckle interferometry at SOAR in 2012 and 2013
• Speckle interferometry and orbits of "fast" visual binaries
• New Periodic Variables from the Hipparcos Epoch Photometry
• Speckle interferometry at SOAR in 2014
• Observations of Binary Stars with the Differential Speckle Survey Instrument. VI. Measures During 2014 at the Discovery Channel Telescope
• Astrometric Orbits for Hipparcos Stochastic Binaries
• Search for associations containing young stars (SACY). VI. Is multiplicity universal? Stellar multiplicity in the range 3-1000 au from adaptive-optics observations
• Revealing companions to nearby stars with astrometric acceleration
• High-resolution imaging at the SOAR telescope
• Reverse dynamical evolution of Eta Chamaeleontis
• The Calar Alto lunar occultation program: update and new results

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