A Closer Look at the Soft X-ray Transient X1608-52: Long-term Optical/X-ray Observations

Abstract

We report long-term simultaneous optical and (RXTE) X-ray observations of the soft X-ray transient and low mass X-ray binary X1608-52 spanning from 1999 to 2001. In addition to the usual X-ray outburst and quiescent states, X1608-52 also exhibits an extended low intensity state during which the optical counterpart, QX Nor, is found to be about two magnitudes brighter than during quiescence. We detect optical photometric variability on a possible period of 0.5370 days with a semi-amplitude of ~0.27 mag in the I band. The modulation could be orbital but is also consistent with a scenario invoking a superhump with decreasing period. Observations of QX Nor during quiescence indicate an F to G type main sequence secondary while theoretical considerations argue for an evolved mass donor. Only an evolved mass donor would satisfy the condition for the occurrence of superhumps.

26 pages, 10 figures, ApJ, in press

References in corpus (3)

• The disc instability model of dwarf-novae and low-mass X-ray binary transients
• The mass donor of Scorpius X-1 revealed
• Z Cam stars: a particular response to a general phenomenon

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