Abstract
We report pulsations in the X-ray flux of RX J0101.3 7211 in the Small Magellanic Cloud (SMC) with ap eriod of (455 2) s in XMM-Newton EPIC-PN data. The X-ray spectrum can be described by a power-law with a photon index of 0:6 0:1. Timing analysis of ROSAT PSPC and HRI archival data conrms the pulsations and indicates a period increase of 5 s since 1993. RX J0101.3 7211 varied in brightness during the ROSAT observations with timescales of years with a maximum unabsorbed flux of 6 10 13 erg cm 2 s 1 (0.1{2.4 keV). The flux during the XMM-Newton observation in the ROSAT band was lower than during the faintest ROSAT detection. The unabsorbed luminosity derived from the EPIC-PN spectrum is 2 10 35 erg s 1 (0.2{10.0 keV) assuming a distance of 60 kpc. Optical spectra of the proposed counterpart taken at the 2.3 m telescope of MSSSO in Australia in August 2000 show strong H emission and indicate a Be star. The X-ray and optical data conrm RX J0101.3 7211 as a Be/X-ray binary pulsar in the SMC.
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