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SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.
| A search for X-rays from runaway stars
Enhanced X-ray emission from an early-type runaway star would be directevidence for the presence of a collapsed companion, and thus for itsorigin as the result of a supernova explosion in a massive binary. Totest this idea, measurements of X-ray fluxes in the 0.5-3 keV energyrange from nine O and B type runaway stars were made with the EinsteinObservatory. In each case, the X-ray luminosity observed does not exceedthat expected from a normal OB star. Therefore we conclude that, if therunaway stars have collapsed companions, the separations of thecomponents must be much greater than those in normal OB binaries.
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