The Revised Orbit of the Delta Sco System

Abstract

In anticipation of the possible collision between a circumstellar disk and the secondary star in the highly eccentric binary system Delta Scorpii, high angular resolution interferometric observations have been acquired aimed at revising the binary parameters. The Navy Prototype Optical Interferometer (NPOI) was used to spatially resolve the binary components in 2000 and over a period between 2005 and 2010. The interferometric observations are used to obtain the angular separations and orientations of the two stellar components at all epochs for which data has been obtained, including 2005 and 2006, for which based on previous studies there was some uncertainty as to if the signature of binarity can be clearly detected. The results of this study represent the most complete and accurate coverage of the binary orbit of this system to date and allow for the revised timing of the upcoming periastron passage that will occur in 2011 to be obtained.

Accepted to ApJ Letters, 10 pages, 3 figures, 1 table

References in corpus (5)

• The High Angular Resolution Multiplicity of Massive Stars
• Properties of the $\delta$ Scorpii Circumstellar Disk from Continuum Modeling
• A new determination of the orbit and masses of the Be binary system delta Scorpii
• Spectro-interferometry of the Be star delta Sco: Near-Infrared Continuum and Gas Emission Region Sizes in 2007
• Infrared Excess in the Be Star Delta Scorpii

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• Surveying the Bright Stars by Optical Interferometry III: A Magnitude-Limited Multiplicity Survey of Classical Be-Stars
• The 2011 Periastron Passage of the Be Binary delta Scorpii
• Spiral Density Enhancements in Be Binary Systems
• The Large Scale Behaviour in the Disk of $\delta$ Scorpii from 2000-2018
• Newborn Be star systems observed shortly after mass transfer
• Using Photometry to Probe the Circumstellar Environment of delta Scorpii
• Observation of double star by long-baseline interferometry
• Strong Variability in AzV 493, an Extreme Oe-Type Star in the SMC
• Interactions in massive binary stars as seen by interferometry