Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..313r&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars , Stellar Systems, and the Sun (2001 July 30 - Augus
Astronomy and Astrophysics
Astrophysics
1
Α Cen, Procyon, Coronal Spectra, Chandra (Letgs), Xmm-Newton (Rgs)
Scientific paper
We have obtained the spectra of the coronae of α Centauri and Procyon using the Reflection Grating Spectrometer (RGS) on board XMM-Newton and the Low Energy Transmission Grating Spectrometer (LETGS) on board Chandra. From measured line fluxes of H- and He-like lines of Carbon, Nitrogen and Oxygen and of strong lines of Fe IX and Fe X temperature estimates and emission measures EM have been obtained. For all three stars (Procyon, α Cen (G2V),
and α Cen (K1V)) the temperatures are in the regime of 1-2 MK. The emission measure for Procyon is about 1× 1050 cm-3 and for both components of α Cen about 8 × 1048 cm-3. Global fits to the total spectrum using SPEX show significant temperature components around 1 and 2 MK. Self-consistent continuous emission measures have been constructed. The α Cen (K1V) is somewhat hotter than its G2V companion.
Audard Marc
Behar Ehud
Güdel Manuel
Kaastra Jelle S.
Mewe Rolf
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