A Search for the Optical Counterpart of the triple pulsar system PSR B1620−26 in M4 | Zendy

A. Shearer | Zendy; R. P. Butler | Zendy; R. M. Redfern | Zendy; M. Cullum | Zendy; A. C. Danks | Zendy

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A Search for the Optical Counterpart of the triple pulsar system PSR B1620−26 in M4

Author(s) -

A. Shearer,

R. P. Butler,

R. M. Redfern,

M. Cullum,

A. C. Danks

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310398

Subject(s) - physics , photometry (optics) , globular cluster , astrophysics , pulsar , astronomy , star cluster , cluster (spacecraft) , stars , computer science , programming language

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 to 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.

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