Physics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop..140b&link_type=abstract
Chandra Proposal ID #01200720
Physics
Chandra Proposal Id #01200720
Scientific paper
Canopus (F0 Ib), the nearest (96 pc) supergiant, is a He-burning, post-red supergiant star that recently redeveloped a 20 million K corona and powers this corona at log Lx = 29.8 erg/s despite having a very thin convection zone. The coronae of Canopus and similar stars are remarkably constant, suggesting that while, the magnetic loops are efficiently heated, there is little interaction between the loops. Canopus is the brightest late-type supergiant in X-rays. We propose a 100 ksec HETG observation to measure the detailed coronal temperature and EM distributions for this unusual type of corona. Coronal abundances and densities will be estimated. In conjunction with HST/STIS spectra, we will investigate the coronal energy balance and heating mechanisms, and magnetic loop properties.
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