A search for the optical counterpart of the triple pulsar system psr b1620−26 in m4
Redfern, R. M.
Danks, A. C.
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Shearer, A. Butler, R.; Redfern, R. M.; Cullum, M.; Danks, A. C. (1996). A search for the optical counterpart of the triple pulsar system psr b1620−26 in m4. The Astrophysical Journal 473 (2),
We have performed photometry in B and V of the field of the triple system PSR B1620-26 in the globular cluster M4. Our images were taken with two two-dimensional imaging photon-counting detectors, which permitted deep exposures td be made without saturation. Photometry of the proposed optical counterpart of the second companion of PSR B1620-26 was obtained, yielding a magnitude V=21.30 +/- 0.08 and a color B - V = 1.32 +/- 0.20. The color index has not been successfully determined previously. These values locate the counterpart on the main sequence of the cluster color-magnitude diagram and lead to a mass determination that is consistent with a 0.48 M. cluster main-sequence star.