An 11-ms pulsar in the globular cluster TER 5 - A possible test for determination of the progenitor of millisecond pulsars

Astronomy and Astrophysics – Astronomy

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Globular Clusters, Main Sequence Stars, Pulsars, Stellar Evolution, X Ray Binaries, Cataclysmic Variables, Companion Stars, Pulse Duration, Roche Limit, Stellar Mass, White Dwarf Stars

Scientific paper

The evolutionary status of a close binary system in the globular cluster Ter 5 is investigated. The system has an orbital period of 1.8 h and includes a millisecond pulsar (MSP) with a period of 11 ms. It is shown that the observed parameters of this system may be obtained if it is assumed that the pulsar companion is a main-sequence star evaporating under the influence of MSP radiation. In that case the progenitor of the MSP is a low-mass X-ray binary, and the evaporation begins after cessation of the mass exchange in the period gap of cataclysmic variables. Calculations show that such a companion must fill its Roche lobe again at an orbital period of 1.1 h, with accretion X-ray luminosity approximating 10 to the 35th to 10 to the 36th erg/s.

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