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The launch of
ASCA enabled the
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first X-ray
spectra of cosmic
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sources with CCD
resolution -
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roughly 5 - 6
times better than the
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resolution
achievable with the
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earlier prop
counter experiments.
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Observations of
stellar coronae
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indicated the
presence of multiple
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temperature
components, as well as
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anomalous
abundances for O, Ne,
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Mg, Si, S, and
Fe.
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This spectrum of
RZ Cas (an Algol
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binary) indicated
subsolar
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abundances by
factors of 2 - 5, very
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similar to what
had been found for
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RS CVn’s, but not
for less active
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single stars.
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Singh,
Drake, and White, 1995,
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Ap.J.,445,
840.
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