Completion of F Dwarf Activity Relations Study

Details Completion of F Dwarf Activity Relations Study Completion of F Dwarf Activity Relations Study

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1835l&link_type=abstract

IUE Proposal ID #AFGJL

Computer Science

Scientific paper

We propose to complete our study of chromospheric and transition region fluxes in early F dwarfs begun under program AFFJL. We are studying the correlations between chromospheric surface fluxes and rotation, age, and color (indicative of the depth of the convective zone), using SWP spectra to obtain fluxes for emission lines formed at temperatures of -8000 K (01) through 200,000 K (NV). We need a complete grid of stars in the (BV)-(Vsini) plane to determine at what color the dynamo turns on (the activity begins to correlate with Vsini), and to see how activity levels at a fixed Vsini are affected by convection zone depth and stellar age, in case of a contribution from a decaying primordial magnetic field in the youngest stars. Completion of the program (25% of the SWP spectra requires 6 shifts. We also request 4 shifts to observe four young (~7x10^7 yrs) F dwarfs in the Pleiades Cluster, specifically to study the dependence of activity levels upon age in very young stars not available in the field or in the Ursa Major or Hyades Clusters which have already been studied. We believe that the completion of this program during the seventh year of IUE will lead to a major increase in our understanding of F dwarf chromospheres and transition regions, and provide real guidance in formulating observing strategies for the observation of these stars by Space Telescope.

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