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A Possible Optical Counterpart for the Triple Pulsar System PSR B1620-26

C. D. Bailyn, E. P. Rubenstein, T. M. Girard, D. Dinescu, F. A. Rasio, B. Yanny

astro-pharXiv:astro-ph/9407080

Abstract

We have searched deep optical images of the globular cluster M4 for a possible optical counterpart for the third body in the PSR B1620-26 system. We identify as a possible optical counterpart a star located within 0.3'' of the nominal pulsar position with V≈ 20. This magnitude is consistent with a main sequence cluster member with M≈ 0.45M. However, this star may be blended with fainter stars, and the probability of a chance superposition is non-negligible.

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