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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
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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 $V\approx 20$. This magnitude is consistent with a main sequence cluster member with $M\approx 0.45M_\odot$. However, this star may be blended with fainter stars, and the probability of a chance superposition is non-negligible.

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C. D. Bailyn, E. P. Rubenstein, T. M. Girard, D. Dinescu, F. A. Rasio, B. Yanny. 1994-07-26. A Possible Optical Counterpart for the Triple Pulsar System PSR B1620-26. https://doi.org/10.1086/187555

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