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arxiv: astro-ph/0310032 · v1 · submitted 2003-10-01 · 🌌 astro-ph

Coronae of Cool Stars

M. Audard (1) , S. A. Drake (2 , 3) , M. G\"udel (4) , R. Mewe (5) , R. Pallavicini (6) , T. Simon (7) , K. P. Singh (8)
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S. L. Skinner (9) N. E. White (3) ((1) Columbia University (2) USRA (3) NASA/GSFC (4) Paul Scherrer Institut (5) SRON-Utrecht (6) Palermo Observatory (7) University of Hawaii (8) Tata Institute of Fundamental Research (9) CASA/Univ. of Colorado)
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keywords broadeningcoronalabundancesaraebelievedchandracompositioncontext
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We present preliminary results of grating observations of YY Mensae and V824 Arae by Chandra and XMM-Newton. Spectral features are presented in the context of the emission measure distributions, the coronal abundances, and plasma electron densities. In particular, we observe a coronal N/C enhancement in YY Men believed to reflect the photospheric composition (CN cycle). Finally, we interpret line broadening in YY Men as Doppler thermal broadening in its very hot corona.

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