Spectrum and Distance of Source Sco XR-1

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Science  23 Sep 1966:
Vol. 153, Issue 3743, pp. 1527-1528
DOI: 10.1126/science.153.3743.1527


In a broad sky survey for x-ray sources in the 44-to 60-Å range only Sco XR-1 was detected. The spectral evidence indicates that Sco XR-1 may lie within a few hundred light-years of the sun. Its spectrum appears to be complex possibly a mixture of thermal sources at different temperatures or of thermal and nonthermal components, as has been predicted for an active neutron star with an associated corona or magnetosphere.