A 190 second periodicity in the optical emission of the enigmatic X-ray source GX 339-4
- NASA, Ames Research Center, Moffett Field, CA (USA) Oregon Univ., Eugene (USA) Los Alamos National Laboratory, NM (USA) Mount Wilson and Las Campanas Observatories, Pasadena, CA (USA)
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. 24 refs.
- OSTI ID:
- 6480146
- Journal Information:
- Astrophysical Journal; (USA), Vol. 359; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources