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- W2067533103 abstract "Using the Ly-lines of carbon and nitrogen measured in Chandra Low Energy Transmission Grating Spectrometer (LETGS) spectra we study the coronal abundances of these elements in a sample of late-type stars including dwarf stars, the prototypical eclipsing binary Algol, the single giant Cet, and three RS CVn binaries. In the main sequence stars of our sample the flux ratio RNC between the Ly-lines of nitrogen and carbon is below unity, while RNC is found to be8.5 for Cet and >23.3 for Algol. These values are more than an order of magnitude larger than expected from a solar abundance plasma in collisional equilibrium regardless of the chosen temperature structure. We therefore interpret the anomalously large RNC-ratios as being due to the exposure of CNO-cycle processed material at the surfaces and in the coronae of Algol and Cet." @default.
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- W2067533103 date "2002-05-28" @default.
- W2067533103 modified "2023-10-11" @default.
- W2067533103 title "Carbon and nitrogen abundances in the coronae of Algol B and other evolved stars: Evidence for CNO-cycle processed material" @default.
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- W2067533103 doi "https://doi.org/10.1051/0004-6361:20020558" @default.
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