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Keywords:

  • techniques: photometric;
  • stars: individual: NGC 1313 X-2;
  • stars: variables: general;
  • galaxies: individual: NGC 1313;
  • X-rays: binaries;
  • X-rays: individual: NGC 1313 X-2

ABSTRACT

We analysed the longest phase-connected photometric data set available for NGC 1313 X-2, looking for the ∼6-day modulation reported by Liu et al.. The folded B-band light curve shows a ∼6-day periodicity with a significance slightly larger than 3σ. The low statistical significance of this modulation, along with the lack of detection in the V band, makes its identification uncertain.