The bright optical companion to the eclipsing millisecond pulsar in NGC 6397

Details The bright optical companion to the eclipsing millisecond pulsar in NGC 6397 The bright optical companion to the eclipsing millisecond pulsar in NGC 6397

2001-08-15

arxiv.org/abs/astro-ph/0108252v1

Astronomy and Astrophysics

Astrophysics

9 pages, 4 embedded figures, submitted to ApJ Letters

Scientific paper

10.1086/324563

We report the possible optical identification of the companion to the eclipsing millisecond pulsar PSR J1740-5340 in the globular cluster NGC 6397. A bright variable star with an anomalous red colour and optical variability which nicely correlates to the orbital period of the pulsar has been found close to the pulsar position. If confirmed, the optical light curve, reminiscent of tidal distorsions similar to those observed in detached and contact binaries, support the idea that this is the first case of a Roche lobe filling companion to a millisecond pulsar.

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