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Optical Pulsations in Two SMC Be/X-ray Pulsars

ATEL # 1406; P. C. Schmidtke (Arizona State University), A. P. Cowley (Arizona State University)
on 3 Mar 2008; 22:34 UT
Password Certification: Paul Schmidtke (

Subjects: Optical, X-ray, Binaries, Neutron Stars, Pulsars

We have analyzed the MACHO and OGLE II light curves of SXP25.5 (XMMU J004814.1-731003) and SXP327. SXP25.5 (RA=00:48:14.1, Dec=-73:10:04.0) is identified with stars OGLE II smc_sc4_i_171264 (I~15.6) and MACHO 212.15849.52 (R~15.6). The light curves show strong non-radial pulsations (NRP) at 0.5983 days. Long-term (hundreds of days) irregular ~0.1 mag variations are also present. SXP327 (RA=00.52:52.5 Dec=-72:17:14.9) has been identified by M. Coe (see It is MACHO star 207.16147.60 with R~16.5. The light curve shows two pulsation periods, with a very strong period at P=0.9762 days and a second period at P=0.9364 days. In addition, the MACHO light curve shows a slow downward trend of ~0.3 mag over 7.5 years of observation.

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