The Orbit of the Binary Star Delta Scorpii

Abstract

Although delta Scorpii is a bright and well-studied star, the details of its multiplicity have remained unclear. Here we present the first diffraction-limited image of this 0.12 arcsec binary star, made using optical interferometry, and resolve the confusion that has existed in the literature over its multiplicity. Examining published speckle measurements, together with the present result, reveals a periodicity of 10.5 yr and allows calculation of the orbital parameters. The orbit has a high eccentricity (e=0.82) and large inclination (i=70 degrees), making it a favourable target for radial velocity measurements during the next periastron (in 2000).

(LaTex 8 pages. Send email to '[email protected]' for 4 postscript figures). To appear in the Astronomical Journal, August, 1993. ESO-TRB

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• Surveying the Bright Stars by Optical Interferometry III: A Magnitude-Limited Multiplicity Survey of Classical Be-Stars
• Spectro-interferometry of the Be star delta Sco: Near-Infrared Continuum and Gas Emission Region Sizes in 2007
• Using Photometry to Probe the Circumstellar Environment of delta Scorpii
• Infrared Excess in the Be Star Delta Scorpii
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