Photometric Periods for SMC Be/X-ray Pulsars SXP645 and SXP726

Astronomy and Astrophysics – Astronomy

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Optical, X-Ray, Binaries, Neutron Stars, Pulsars

Scientific paper

SXP645: Recently, Haberl et al. (arXiv:0806.4132v1) discovered X- ray pulsations with a period of 645 s in the transient source XMMU J005535.2-722906. They identified the optical counterpart in the MACHO and OGLE-II data sets with a V=14.6 star that brightened by ~0.85 mag near MJD 50100 and faded to its original brightness at MJD 51800 (see their Fig. 7). We have searched the early, low-state, MACHO R data and found a strong sinusoidal signal (with a normalized power of 52 in the periodogram) at P=0.41606 d.

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