Swift J0513.4−6547 = LXP 27.2: a new Be/X-ray binary system in the Large Magellanic Cloud

• DOI: 10.1093/mnras/stu2562
• Publication Date: 2015-01-02T21:04:54Z
• Authors: M. J. Coe; M. Finger; E. S. Bartlett; A. Udalski
• Keywords: Large Magellanic Cloud; Orbital period; Small Magellanic Cloud; Eclipse; X-ray binary

An exceptionally bright new X-ray source in the Large Magellanic Cloud was discovered by Swift/BAT telescope on MJD 54923 (2009 April 2), and shown to have a pulse period of 27 s using follow-up observations RXTE/PCA (Krimm et al. 2009). We report here detailed timing taken over following weeks Fermi/Gamma Ray Burst Monitor (GBM) which reveal an excellent orbital solution indicate that flux is peaked at ∼1038 erg s−1. In addition, we optical (spectroscopic photometric) permit classification mass donor star as B1Ve, furthermore strong modulation consistent with binary found from Fermi/GBM data – 27.4 d. The dynamical estimate for Be not agreement expected B1V mismatch similar this has been previously reported few other stars also estimates. neutron magnetic field determination (∼1013 G) adds further evidence possibility many such high-mass systems may fields greater than (∼1012 G).