The 8 second optical quasi-periodic oscillations in GX 339 - 4

Details The 8 second optical quasi-periodic oscillations in GX 339 - 4 The 8 second optical quasi-periodic oscillations in GX 339 - 4

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..312i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 312-316. Research supported by DOE, Research Corp.,

Astronomy and Astrophysics

Astronomy

17

Black Holes (Astronomy), Stellar Oscillations, X Ray Binaries, Accretion Disks, Astronomical Photometry, Emission Spectra, Power Spectra

Scientific paper

Submillisecond optical photometry of the black hole candidate GX 339 - 4 was obtained on August 1, 1989, (UT) using the 1.5 m telescope of the Cerro Tololo Inter-American Observatory. Eight second quasi-periodic oscillations of width 0.02-0.04 Hz and root mean square amplitude 4-6 percent are found. The visual magnitude of GX 339 - 4 at the beginning of the observation was m(v) = 17.7. Motch et al. (1985) have previously reported 7 s optical quasi-periodic oscillations when GX 339 - 4 was also m(v) = 17.7 and in an X-ray off-state. No X-ray observations were made during the present optical observations and so the X-ray state of GX 339 - 4 cannot be ascertained. In addition, Motch et al. have also reported 20 s optical quasi-periodic oscillations with 30-40 percent full amplitude but when GX 339 - 4 was much brighter, m(v) = 15.4, and in a hard X-ray state.

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