Discovery of an optical modulation in Swift J0513.4-6547
ATel #5511; M. J.Coe (Southampton University), A. Udalski (Warsaw) & M. Finger (NSSTC)
on 25 Oct 2013; 16:16 UT
Credential Certification: Malcolm Coe (mjcoe@soton.ac.uk)
Subjects: Optical, X-ray, Binary, Neutron Star, Transient
Referred to by ATel #: 6483
The bright LMC X-ray transient was discovered in 2009 and shown to exhibit a 27s pulse period (see ATels 2011, 2012, 2013 & 2023). Analysis of the OGLE IV I-band data reveal a strong modulation with a period of 27d, and a modulation profile that strongly suggests binary behaviour. Such a pulse-binary period combination would put the source comfortably in the Be/X-ray binary regime of the Corbet diagram and confirms the general nature of the suggested optical counterpart.
