Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12374a&link_type=abstract
HST Proposal ID #12374. Cycle 18
Physics
Scientific paper
Nearby Alpha Centauri contains the two best characterized G and K dwarfs, next to the Sun itself, thanks to the accurate orbit, resolved angular diameters, and well understood co-evolutionary state. Alpha Cen A & B also have the best studied stellar X-ray activity cycles, extending back to the 1970?s. In fact, Chandra LETGS spectra of the double star are superior to any existing solar material in the crucial 2-20 nm band, accounting for bulk of Sun?s XUV emission {relevant to Space Weather}. Present proposal is to continue the evolving coronal narrative with dual HRC-I pointings in Cycle 12, and an LETGS spectrum of the sun-like pair close to the peaks of their X-ray cycles. STIS FUV spectra will leverage the coronal line measurements {e.g., dynamics and low-T B.C. for DEM modeling}.;
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