Abstract:
The variable star V 818 Sco identified as the optical counterpart
of Scorpius X-1 (Sandage et a1.,1966) has been extensively
studied by many photometric observers. Despite these extensive
observations including those with high time resolutions, the
nature of Sco X-1 is still uncertain. This star was observed with
the 104 cm reflector, having a thermoelectrically cooled EMI 6094 S
photomultiplier at the Uttar Pradesh State Observatory. Usual
d.c. techniques were used to record the observations on four
nights during April 1977 - May 1978. Star C (Lyutyi, 1972) was
used as the comparison star.
