Distant Futures of Solar Activity

Details Distant Futures of Solar Activity Distant Futures of Solar Activity

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6066a&link_type=abstract

HST Proposal ID #6066

Physics

Plasma Physics

Hst Proposal Id #6066 Cool Stars

Scientific paper

We will explore possible future fates of solar magneticactivity through high-S/N GHRS spectra of the ancient Sunanalog, Arcturus (K1 III). The fundamental mechanisms that drivethe hot (T>10^6 K) coronae of cool stars remain elusive. Solvingthe mystery is a central theme of the ``solar-stellar connection;''whose importance extends beyond astronomy to areas ranging frombasic plasma physics to solar-terrestrial relations. Asignificant property of the activity is that it subsides withage: G dwarfs in young clusters are intense coronal sources,whereas old low mass K giants are so feable in soft X-raysthat most are below current detection limits. For thatreason, historical studies of activity have been biasedtowards the younger stars. Now the HST/GHRS easily can recordfaint coronal proxies (like Si IV and C IV) in nearby coolsubgiants and giants, thereby mitigating the de facto agediscrimination. In the solar neighborhood the brightestsingle star of advanced age (9--11 Gyr) is Alpha Bootis (K1 III).Previous studies have placed the archetype red giant firmly inthe ``coronal graveyard.'' Our project focuses on understandingthe ``basal'' chromosphere; molecular cooling catastrophes andthe structure of the passive ``COmosphere;'' the dynamics andenergy balance of the residual subcoronal gas; and mass lossmechanisms. (Secondary target Beta Hydri was eliminated owing toreduced TAC orbit allocation.)

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