TIME-SERIES ANALYSIS OF BRIGHT GALACTIC-X-RAY SOURCES

We analyze 70 to 110 day data sets from eight bright galactic X-ray bi naries observed by WATCW/Eureca, in search of periodic variations. We obtain new epochs for the orbital variation of Cyg X-3 and 4U 1700-37, and confirmation of a dip in Cyg X-1 at superior conjunction of the X -ray star. No evidence for variation at known and candidate periods is seen for Sco X-1, Cyg X-2, and CX 17+2. We set upper limits for varia tion at other frequencies in those three sources, GX 5-1, and GRS 1915 +105.