Abstract
We discuss the optical identification of 9 Be/X-ray binary optical counterparts of X-ray sources in the Magellanic clouds, most of them discovered in ROSAT observations. Imaging CCD photometry (using BV RC and Hα filters) was employed to search the typically 20 arcsec radius error circles for early-type stars exhibiting Hα emission. Spectroscopy of 5 candidates confirmed the presence of Hα emission. Based on the positional coincidences, we propose Be star optical counterparts to all of 9 X-ray sources: 6 from ROSAT and one each from ASCA, EXOSAT and HEAO-1. All of the sources exhibit the typical X-ray characteristics of Be/neutron star X-ray binaries: transient nature or strong variability, relatively hard X-ray spectra and, in 5 cases, detections of probable neutron star spin periods in the range 8.9 to 91.1 seconds.
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