Timing measurements of the binary millisecond pulsar in the globular cluster M4

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Binary Stars, Globular Clusters, Orbital Mechanics, Pulsars, Gravitational Effects, Periodic Variations, Stellar Evolution

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The authors report the results of timing observations of PSR 1620-26, including a first determination of its period derivative P= 3.2±0.4×10-19s s-1 and its orbital eccentricity e = 0.025316±0.000003. The age of this millisecond pulsar is less than 2.2×108years. The relatively high eccentricity is probably a result of gravitational encounters with other stars in the cluster during this time.

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