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A search for optical pulsations from GX 1+4 at H-alphaH-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.
Document ID
19780065313
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Krzeminski, W.
(California Institute of Technology, Pasadena, Calif.; Polska Akademia Nauk, Centrum Astronomiczne Warsaw, Poland)
Priedhorsky, W. C.
(California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1978
Publication Information
Publication: Astronomical Society of the Pacific
Subject Category
Astrophysics
Accession Number
78A49222
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-207
Distribution Limits
Public
Copyright
Other

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