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Coronal abundances in RS CVn with well determined photospheric abundances

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ESA Earth Online2026-06-22 收录
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We propose to obtain good S/N RGS observations of two RS CVntype binaries (V851 Cen and AG Dor) for which we have recently obtained detailed chemical analysis of their photospheric composition. This will allow to study the presence of a FIP (or inverse FIP, as recently indicated by XMM RGS analyses of other active binaries) by detailed comparison with their photospheric abundance rather than by comparison with a solar mix. This appears to be particularly r^ant as our photospheric analysis shows that the photosphere chemical composition for these stars appears to be significantly different fromthe solar one. The data obtained here will thus allow a detailed discussion of whether an inverse FIP effect is present in the corona of active binaries. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]

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European Space Agency
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