Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7389b&link_type=abstract
HST Proposal ID #7389
Other
Hst Proposal Id #7389 Cool Stars
Scientific paper
This proposal seeks to obtain additional empirical constraints on the heating mechanisms for stellar chromospheres, transition layers and coronae. These mechanisms may depend on effective temperature, gravity, rotation, magnetic fields, age, chemical abundances, and possibly binarity. Thus, we need to disentangle the dependences on all these parameters if we want to identify the heating mechanisms. We propose to study main sequence F stars in the Hyades and Pleiades. For each cluster two parameters are constant: age and chemical abundances. Gravity is also essentially constant. We still have to deal with at least 3 remaining parameters. This means we need to observe as many stars as feasible. The comparison of the Hyades and Pleiades stars will tell us the age dependence for the young stars. The verification of any age dependence, separately from the one on rotation, will show the influence of parameters other than rotation and those related to convection, which is not expected to depend on age. Main sequence F stars are the brightest cluster stars with strong chromospheric and transition layer emission. Changes in the heating mechanism occur around spectral type F5. The related changes in chromospheric and transition layer emission, and the steeply decreasing rotational velocities may hold the clue to the identification of the heating mechanisms.
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