Precise Localization of GRO J2058+42

Physics

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Chandra Proposal Id #05400189

Scientific paper

We propose to precisely locate the probable Be/X-ray binary GRO J2058+42 by observing it at the outburst phase of its binary orbit with ACIS-I. The HETG will be inserted to reduce pile-up in the zeroth order image and to obtain a spectrum, including a measure of column density. We will use proven techniques to precisely locate the source, regardless of pile-up. GRO J2058+42 has been regularly active since 1995, unlike most Be/X-ray binaries which undergo short series of outbursts. Determining an optical counterpart is especially important for GRO J2058+42 because its long-term X-ray activity makes it an optimal candidate for future multi-wavelength studies of the interactions between the Be star and neutron star, which are crucial to understanding these systems.

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