| Supernova Remnants: Then |
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| However, it
wasn’t long before |
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| the first high
resolution spectra of |
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| SNRs from the
Focal Plane |
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| Crystal
Spectrometer on Einstein, |
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| made those
results obsolete. |
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| Winkler et al.
presented clear |
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| detections of
line emission from |
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| N, O, Ne, and
Fe, in the spectrum |
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| of Puppis A. The line ratios |
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| suggested a range
of |
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| temperatures, T =
2 - 5 x 106 K, |
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| and a possible
overabundance of |
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| Ne. |
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| Winkler et
al., 1981, Ap. J., 246, L27. |