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

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

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..434k&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, Aug.-Sept. 1978, p. 434, 435.

Astronomy and Astrophysics

Astronomy

4

H Alpha Line, Light Emission, Stellar Spectrophotometry, Variable Stars, X Ray Sources, Electromagnetic Pulses, Periodic Variations

Scientific paper

H-alpha observations of the binary-star candidate for the slowly pulsating hard X-ray source GX 1+4 are reported which were undertaken to search for pulsations in the H-alpha flux that are synchronous with the X-ray period of about 2 min. No significant periodic variation of the candidate star was detected in the frequency band searched. Three-sigma upper limits of 1.7% (sinusoidal pulse shape) and 0.7% (X-ray pulse shape) are set for the pulsed fraction of the H-alpha flux. It is noted that because of possible diffusion from a cloud that is optically thick to Balmer radiation, the observed lack of pulsations in the H-alpha flux need not compromise the identification of GX 1+4 with the candidate star.

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