Near-quiescent photometry of the X-ray transient J0422+32

Details Near-quiescent photometry of the X-ray transient J0422+32 Near-quiescent photometry of the X-ray transient J0422+32

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..559m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 2, pp. 559-564.

Astronomy and Astrophysics

Astronomy

11

Accretion, Accretion Discs, Binaries: Close, Binaries: Spectroscopic, Stars: Individual: J0422+32, X-Rays: Stars

Scientific paper

We present I-band photometry of the soft X-ray transient (SXT) J0422+32 taken during a low-brightness state over two weeks in 1993 October. The object had a mean V magnitude of 19.9, approximately 2mag above its subsequent, presumably quiescent, level of V~22.4. These data revealed a periodicity at 16.18h (significance level>99 per cent), but we could find no evidence for the previously reported 5.1-h period. We cannot account for the physical origin of this 16-h modulation, but suspect that it is related to the brightness state of J0422+32. We show that it cannot be an ellipsoidal effect, as the secondary star would be much brighter than the current minimum. The 5.1-h period could be orbital, with a very late-type (~M0-M5) secondary which is too faint to be observable if the distance is >=1 kpc.

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