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A search for optical pulsations from GX 1+4 at H-alpha
1978
Publications of the Astronomical Society of the Pacific
Observations of the Ha flux from the candidate star of Glass and Feast (1973) for the X-ray pulsator GX 1 + 4 show no modulation at the ~ 2-min X-ray period. We set 3a upper limits for the pulsed fraction of the Ha flux of 1.7% (sinusoidal pulse shape) and 0.7% (X-ray pulse shape).
doi:10.1086/130353
fatcat:53fgejdhures5pvjwkw5mzuxym