Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop...95a&link_type=abstract
XMM-Newton Proposal ID #05024902
Astronomy and Astrophysics
Astrophysics
Stars, White Dwarfs, Solar System, Hd145544, Hd157999, Xmm-Newton Proposal 05024902
Scientific paper
XMM-Newton pointings on 5 late-type G/K supergiants in the outskirts of the coronal graveyard will explore the midrange of X-ray activity in evolved late-type stars. Our ambition is to gain insight into magnetic field generation in the absence of sensible rotation, and the disposition of hot coronal structures in the extended outer envelopes of these objects, possibly partially smothered beneath a cool absorber. Such buried activity might be the long sought initiator of chromospheric winds in the giant branch. The project will capture the remaining most promising candidates from UV and X-ray flux limited samples identified in the ROSAT era. Understanding the broad reaches of coronal activity, and its evolution, are key objectives of cool star astrophysics.
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