Constraining the X-ray spectrum of a nearby unusual binary pulsar

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Scientific paper

We propose a 30 ks ACIS-S observation of newly discovered binary pulsar J2222-0137. With a spin period of 32 ms and minimum companion mass of 1.1 solar masses, this pulsar seems to be a member of the rare class of intermediate mass binary pulsars. With an inferred distance of only 300 pc, this is the second closest pulsar binary system (after J0437-4715) and an excellent target for high precision spectral measurements, a neutron star radius measurement, a search for extended emission, and a possible constraint on the nature of this unusual pulsar's companion.

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