Other
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985nascp2358...24l&link_type=abstract
In NASA. Goddard Space Flight Center The Origin of Nonradiative Heating/Momentum in Hot Stars p 24-46 (SEE N85-17755 08-88)
Other
Dwarf Stars, Heating, Hot Stars, Magnetic Fields, Stellar Atmospheres, Stellar Coronas, Subgiant Stars, X Ray Spectra, Emission Spectra, F Stars, G Stars, K Stars, Main Sequence Stars, Stellar Rotation, Ultraviolet Radiation
Scientific paper
Major advances in the acquisition of evidence for and the understanding of nonradiative heating and other activity in stars cooler than Teff = 10,000 K has occurred in the last few years primarily as a result of the IUE and Einstein spececraft. This evidence is critically reviewed and trends that are now becoming apparent are noted. The existence for nonradiatively heated outer atmospheric layers (chromospheres, transition regions, and coronae) in dwarf stars cooler than spectral type A7, in F ang G giants, pre-main sequence stars, and close binary systems in unambiguous, and chromospheres exist in the K and M giants and supergiants. The existence of nonradiative heating in the outer layers of the A stars remains undetermined despite repeated searches at all wavelengths. Some important trends in these data are the decrease in plasma emission measure with age on the main sequence and decreasing rotational velocity. Variability and atmospheric inhomogeneity is commonly seen, and there is considerable evidence that magnetic fields define the geometry and control the energy balance in the outer atmospheric layers.
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