Discovery of a 1247 s pulsar in the Be X-ray binary SAX J2239.3+6116

Abstract

A search for pulsations from the Be X-ray binary SAX J2239.3+6116, through observations with the Narrow Field Instruments on BeppoSAX and the Proportional Counter Array on RXTE, yielded the clear presence of a 1247 s coherent oscillation. Given the fairly high X-ray luminosity on previous occasions (up to a few times 10^36 erg/s in 2 to 28 keV), the oscillation must be due to the spin of a neutron star. Assuming that the 262 day recurrence time is the orbital period, SAX J2239.3+6116 has both the longest orbital period and the longest pulse period of 24 Be X-ray binaries with measured orbital periods.

accepted for A&A Letters, 5 pages

References in corpus (2)

• The Orbit of X Per and Its Neutron Star Companion
• The broad band spectral properties of binary X-ray pulsars

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