Optical variability of the black hole candidate GX339-4 (X1659-487, V821 Ara) - Limits on periodic modulation

Details Optical variability of the black hole candidate GX339-4 (X1659-487, V821 Ara) - Limits on periodic modulation Optical variability of the black hole candidate GX339-4 (X1659-487, V821 Ara) - Limits on periodic modulation

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227.1055c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, Aug. 15, 1987, p. 1055-1064. SERC-supported resear

Astronomy and Astrophysics

Astronomy

15

Astronomical Photometry, Black Holes (Astronomy), X Ray Sources, Emission Spectra, Visible Spectrum

Scientific paper

The authors present results of extensive CCD optical photometry (over 1000 frames representing ≡150 hr of integration time) of the optical counterpart of the X-ray source GX 339-4 obtained during the high (soft) state. The source was seen to be significantly variable. They do not, however, detect any periodic modulation with semi-amplitude greater than ≡0.03 mag for periods less than ≡0.5 day or semi-amplitude greater than ≡0.07 mag for longer periods. An optical spectrum obtained shortly after GX 339-4 made a transition from a 'low' to a 'high' state is also presented and compared with previous results. The width of the He II λ4686 emission line in the spectrum implies that GX 339-4 does not have an unusually low inclination angle and the authors therefore conclude that the orbital period of GX 339-4 is probably longer than ≡0.5 day.

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