Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.123...67g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 123, no. 1, June 1986, p. 67-101.
Astronomy and Astrophysics
Astrophysics
6
Abundance, Chromosphere, Phenomenology, Spectrum Analysis, Binary Stars, Emission Spectra, Red Giant Stars, Stellar Activity, Stellar Coronas, Stellar Luminosity, Stellar Rotation
Scientific paper
An attempt is made to develop a phenomenological interpretation of stellar chromospheres. The following problems are examined: observed emission powers of 'magnesium' chromospheres on stars based on the ultraviolet doublet, 2800 Mg II, observations; dependence of chromosphere emission on spectral and luminosity classes; stellar chromospheres as an accidental event; chromospheres of stars-components of binary systems; stars with the chromospheres of solar type (S) and nonsolar (NS) type; distribution of stars by means of the type of their chromosphere on luminosity class; stars with superpower magnesium emission; emission measures for both the 'magnesium' and 'calcium' chromospheres' interrelation between chromosphere, transition zone and corona; chromospheric activity and rotation of stars; possibility of the existence of chromospheres on hot stars; phenomenological picture of stellar chromospheres; stars without the line 2800 Mg II, in emission or in absorption; syndrome of red giant HD 4174. At the end, the problem of heating of stellar chromospheres is discussed.
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