Mon. Not. R. Astron. Soc., 437, 2948-2956 (2014/January-3)
Optical and X-ray properties of CAL 83 - II. An X-ray pulsation at ∼ 67s.
ODENDAAL A., MEINTJES P.J., CHARLES P.A. and RAJOELIMANANA A.F.
Abstract (from CDS):
CAL 83 is the prototypical close binary supersoft X-ray source in the Large Magellanic Cloud, has a 1 d orbital period, and is believed to consist of a white dwarf (WD) primary accreting from an evolved donor. Based on published WD model atmosphere fits to X-ray data, the WD has a mass of ∼ 1.3M☉, just below the Chandrasekhar limit. From a systematic search through archival XMM-Newton data for periodic emission from CAL 83 down to the shortest possible period just above the WD break-up period, we report the discovery of an ∼ 67s supersoft X-ray modulation, which we interpret as the rotation period of a highly spun-up WD. Such a short period can be explained within the framework of a high mass accretion history, where accretion disc torques could have spun up the WD over time-scales comparable to the thermal time-scale. The presence of carbon, oxygen and nitrogen in published optical and ultraviolet spectra may suggest CNO cycling in the envelope of a secondary star that is oversized for its inferred mass, suggesting that the secondary star shed a significant fraction of its envelope during a high mass-transfer history, resulting in a highly spun-up WD. The reported 67s period shows an approximately ±3s drift from the median value in single runs, which we interpret as a hydrogen burning gas envelope surrounding the WD, with a period not quite synchronized with the WD rotation period.
© 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
accretion, accretion discs - binaries: close - stars: individual: CAL 83 - stars: oscillations - white dwarfs - X-rays: stars
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