Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.323w&link_type=abstract
In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 323-326 (SEE N89-10682 01-89)
Astronomy and Astrophysics
Astronomy
3
Dwarf Stars, Iue, Spaceborne Astronomy, Stellar Activity, Ultraviolet Astronomy, Ultraviolet Spectra, Atmospheric Heating, Convection, Stellar Atmospheres, Stellar Magnetic Fields
Scientific paper
The transition region spectra of 87 late A and early F dwarfs and subgiants were analyzed. The emission line fluxes are uniformly strong in the early F stars, and drop off rapidly among the late A stars. The basal flux level in the F stars is consistent with an extrapolation of that observed among the G stars, while the magnetic component displays the same flux-flux relations seen among solar-like stars. Despite the steep decrease in transition region emission flux for B-V less than 0.28, C II emission is detected in alpha Aql (B-V = 0.22). The dropoff in emission is inconsistent with models of the mechanically generated acoustic flux available. It is concluded that, although the nonmagnetic basal heating is an increasingly important source of atmospheric heating among the early F stars, magnetic heating occurs in any star which has a sufficiently thick convective zone to generate acoustic heating.
Boyd William
Schrijver Carolus J.
Walter Frederick M.
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