Status Report

Upper Limits on the X-ray Emission of “Uranium” Stars

By SpaceRef Editor
January 16, 2003
Filed under , ,

Astrophysics, abstract

From: Eric M. Schlegel <>
Date: Wed, 15 Jan 2003 13:47:50 GMT (183kb)

Upper Limits on the X-ray Emission of “Uranium” Stars

Eric M. Schlegel

Comments: accepted AJ, scheduled March

A paper by Qian & Wasserburg suggests the optical absorption lines of uranium
observed in the spectra of ultra-metal-poor stars (defined as [Fe/H] $<$-3)
arise from contamination from a supernova in a binary star system. Assuming the
binary survived the explosion, a collapsed compact object may be present and
implying potential accretion processes with accompanying X-ray emission. Upper
limits on X-ray emission from an accreting compact object are described here.

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