Orbital Parameters and Timing Results for Pulsars in the Globular Clusters NGC6760, M13, and M53

Astronomy and Astrophysics – Astronomy

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Scientific paper

We report here the Keplerian orbital parameters for the tight binary millisecond pulsar (Porb = 3.5hr) PSR1908+00 in the globular cluster NGC6760 (Anderson et al., IAU Circ. 5013). The pulsar's companion has a minimum mass of 0.018 M_sun. The short orbital period and small mass function makes this system similar to the eclipsing pulsars 1957+20 and 1744-24A. There is no evidence for long-duration eclipses (as seen in 1744-24A), but short-duration eclipses (as in 1957+20) are not yet excluded. We also report timing results for the isolated 10ms pulsar PSR1639+36A in M13, the binary pulsar PSR1639+36B in M13, and the binary pulsar PSR1310+18 in M53. PSR1639+36B in M13 is a 3.5 ms pulsar in a 1.26 d orbit with a companion with minimum mass 0.16 M_sun. PSR1310+18 is a 3.6 ms pulsar in a wide binary (255 d) orbit with a companion of minimum mass 0.31 M_sun.

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