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HST Images of the Eclipsing Pulsar B1957+20

We have obtained images of the eclipsing pulsar binary PSR~B1957+20 using the Planetary Camera of the Hubble Space Telescope. The high spatial resolution of this instrument has allowed us to separate the pulsar system from a nearby background star which has confounded ground-based observations of this system near optical minimum. Our images limit the temperature of the backside of the companion to $T \simlt 2800$~K, about a factor of two less than the average temperature of the side of the companion facing the pulsar, and provide a marginal detection of the companion at optical minimum. The magnitude of this detection is consistent with previous work which suggests that the companion nearly fills its Roche lobe and is supported through tidal dissipation.

preprint1995arXivOpen access
Andrew S. FruchterJay BookbinderCharles D. Bailyn
astro-ph
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Andrew S. FruchterJay BookbinderCharles D. Bailyn

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