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Optical Modulation in the X-Ray Binary 4U 1543–624 Revisited*

  • Z. Wang (a1), A. Tziamtzis (a1), D. L. Kaplan (a2) and D. Chakrabarty (a3)
Abstract

The X-ray binary 4U 1543–624 has been provisionally identified as an ultra-compact system with an orbital period of ≃ 18 min. We have carried out time-resolved optical imaging of the binary to verify the ultra-short orbital period. Using 140 min of high-cadence r′-band photometry, we recover the previously-seen sinusoidal modulation and determine a period P = 18.20 ± 0.09 min. In addition, we also see a 7.0 × 10−4 mag min−1 linear decay, likely related to variations in the source's accretion activity. Assuming that the sinusoidal modulation arises from X-ray heating of the inner face of the companion star, we estimate a distance of 6.0–6.7 kpc and an inclination angle of 34°–61° (90% confidence) for the binary. Given the stability of the modulation, we can confirm that the modulation is orbital in origin and 4U 1543–624 is an ultra-compact X-ray binary.

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Corresponding author
4Email: wangzx@shao.ac.cn
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This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile

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