Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph..100..333l&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 100, Oct. 1985, p. 333-362.
Astronomy and Astrophysics
Astrophysics
52
Astrophysics, Hertzsprung-Russell Diagram, Stellar Activity, Dwarf Stars, Giant Stars, Pre-Main Sequence Stars, Stellar Magnetic Fields, Subgiant Stars, T Tauri Stars, X Ray Astronomy
Scientific paper
Major advances in the understanding of nonradiatively heated outer atmospheric layers (coronae, transition regions, and chromospheres) and other solar-like activity in stars has occurred in the past few years primarily as a result of ultraviolet spectroscopy from IUE, X-ray imaging from the Einstein Observatory, microwave detections by the VLA, and new optical observing techniques. The author critically reviews the observational evidence and comment upon the trends with spectral type, gravity, age, and rotational velocity that are now becoming apparent. He defines a solar-like star as one which has a turbulent magnetic field sufficiently strong to control the dynamics and energetics in its outer atmospheric regions.
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