Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...388l..13s&link_type=abstract
Astronomy and Astrophysics, v.388, p.L13-L16 (2002)
Astronomy and Astrophysics
Astrophysics
18
Stars: Abundances, Stars: Activity, Stars: Coronae, Stars: Late Type X-Rays: Stars, Stars: Individual: Algol
Scientific paper
Using the Lyalpha -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 beta Cet, and three RS CVn binaries. In the main sequence stars of our sample the flux ratio RNC between the Lyalpha -lines of nitrogen and carbon is below unity, while RNC is found to be ~8.5 for beta 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 beta Cet.
Ness Jan-Use
Schmitt Juergen H. M. M.
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