A Search for the Optical Counterpart of the Triple Pulsar System PSR B1620-26 in M4

Details A Search for the Optical Counterpart of the Triple Pulsar System PSR B1620-26 in M4 A Search for the Optical Counterpart of the Triple Pulsar System PSR B1620-26 in M4

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473l.115s&link_type=abstract

Astrophysical Journal Letters v.473, p.L115

Astronomy and Astrophysics

Astronomy

10

Galaxy: Globular Clusters: Individual Messier Number: M4, Stars: Pulsars: Individual Alphanumeric: Psr B1620-26, Stars: Binaries: Close, Techniques: Photometric

Scientific paper

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 Msolar cluster main-sequence star.

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