Optical identification of the companion to PSR J1911-5958A, the pulsar binary in the outskirts of NGC 6752

Details Optical identification of the companion to PSR J1911-5958A, the pulsar binary in the outskirts of NGC 6752 Optical identification of the companion to PSR J1911-5958A, the pulsar binary in the outskirts of NGC 6752

2003-07-18

arxiv.org/abs/astro-ph/0307340v2

Astron.Astrophys.409:L31-L34,2003

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A Letters (September 1st, 2003)

Scientific paper

10.1051/0004-6361:20031339

We report on the identification of the optical counterpart of the binary millisecond pulsar PSR J1911-5958A, located in the outskirts of the globular cluster NGC 6752. At the position of the pulsar we find an object with V=22.08, B-V=0.38, U-B=-0.49. The object is blue with respect to the cluster main sequence by 0.8 magnitudes in B-V. We argue that the object is the white dwarf companion of the pulsar. Comparison with white dwarf cooling models shows that this magnitude and colors are consistent with a low-mass white dwarf at the distance of NGC 6752. If associated with NGC 6752, the white dwarf is relatively young, <2 Gyr, which sets constraints on the formation of the binary and its ejection from the core of the globular cluster.

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