AAS 207th Meeting, 8-12 January 2006
Session 183 Radio and X-Ray Pulsars
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

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[183.19] Photometric Periods of SMC Be/X-ray Pulsars

P. C. Schmidtke, A. P. Cowley (Arizona State University)

We present new photometric periods for two Be/X-ray pulsars in the SMC using MACHO and OGLE-II data. The sources are XMM J005152.2-73102 (also known as SMC 25) with Ppulse=172.2 s and CXOU J010102.7-720658 with Ppulse=304.5 s. The optical counterparts of both X-ray sources are known Be stars in the SMC.

For XMM J005152.2-73102 we find P=69.9 days, which is likely to be the orbital period of the binary system. The OGLE-II data show recurring outbursts lasting about 0.2P, with an amplitude of ~0.02-0.03 mag. This is similar to orbital outbursts seen in other Be/X-ray binaries.

The longterm optical light curve for CXOU J010102.7-720658 shows pronounced non-radial pulsations (NRP) near 0.26 days. Like other Be stars with NRP, the period and phasing change slightly with time. A possible orbital period of 520 days is suspected, but further data are needed to confirm this.

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