Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26arv...1..177p&link_type=abstract
Astronomy and Astrophysics Review (ISSN 0935-4956), vol. 1, July 1989, p. 177-207. Research supported by Agenzia Spaziale Italia
Astronomy and Astrophysics
Astrophysics
65
Emission Spectra, Stellar Coronas, X Ray Spectra, B Stars, Binary Stars, Dwarf Stars, Giant Stars, Hertzsprung-Russell Diagram, O Stars, Stellar Activity
Scientific paper
Current observational resources and theoretical understanding pertaining to the tenuous, high-temperature coronae surrounding stars of virtually all spectral types and luminosity classes, which emit most of their radiation in the soft X-ray portion of the spectrum, are evaluated; much of the progress made in this field of study to date has proceeded from extensive Einstein and Exosat observations. Different candidate mechanisms for coronal emission in different parts of the HR diagram are assessed, and attention is given to broader scenarios proposed to account for these data. It is found that, despite the substantial progress made in recent years, understanding of stellar coronal emission is still largely phenomenological.
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