A search for optical pulsations from GX 1+4 at H-alpha

W. Krzeminski, W. C. Priedhorsky
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