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We present the results of an all-sky survey made with the Fine GuidanceSensor on Hubble Space Telescope to search for angularly resolved binarysystems among the massive stars. The sample of 224 stars is comprised mainly ofGalactic O- and B-type stars and Luminous Blue Variables, plus a few luminousstars in the Large Magellanic Cloud. The FGS TRANS mode observations aresensitive to detection of companions with an angular separation between 0."01and 1."0 and brighter than $\triangle m = 5$. The FGS observations resolved 52binary and 6 triple star systems and detected partially resolved binaries in 7additional targets (43 of these are new detections). These numbers yield acompanion detection frequency of 29% for the FGS survey. We also gatheredliterature results on the numbers of close spectroscopic binaries and widerastrometric binaries among the sample, and we present estimates of thefrequency of multiple systems and the companion frequency for subsets of starsresiding in clusters and associations, field stars, and runaway stars. Theseresults confirm the high multiplicity fraction, especially among massive starsin clusters and associations. We show that the period distribution isapproximately flat in increments of log P. We identify a number of systems ofpotential interest for long term orbital determinations, and we note theimportance of some of these companions for the interpretation of the radialvelocities and light curves of close binaries that have third companions.

The Multiplicity of Massive Stars: A High Angular Resolution Survey with the HST Fine Guidance Sensor