A 190 second periodicity in the optical emission of the enigmatic X-ray source GX 339-4

Details A 190 second periodicity in the optical emission of the enigmatic X-ray source GX 339-4 A 190 second periodicity in the optical emission of the enigmatic X-ray source GX 339-4

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..197s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. 197-203. Research supported by the Research Corp., D

Astronomy and Astrophysics

Astronomy

14

Astronomical Photometry, Black Holes (Astronomy), Light Emission, X Ray Binaries, Accretion Disks, Companion Stars, Neutron Stars, Power Spectra, Pulse Modulation, X Ray Sources

Scientific paper

The results are reported of submillisecond white-light optical photometry of the X-ray source GX 339-4 obtained over the years 1985-1988 at the Las Campanas Observatory and Cerro Tololo Inter-American Observatory. A coherent, df/f less than 0.025, 5.25 mHz feature with pulsed amplitude up to 50 percent is found which persisted for about 20-30 cycles. The feature only appeared in data taken in July 5, 1986 UT. The 885 Hz feature proposed by Imamura et al. (1990) was not detected at 90-percent-confidence upper limits of 2 percent pulsed emission. The 885 Hz feature was reported by Imamura et al. to have a pulsed amplitude of 2.3-2.4 percent. The proposed 0.2 mag, 0.618 day orbital variation proposed by Honey et al. (1988) could not be verified due to the length of the data strings.

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