Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.106....1g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 106, no. 1, Nov. 1984, p. 1-34.
Astronomy and Astrophysics
Astrophysics
8
Chromosphere, Emission Spectra, Flare Stars, Light Curve, Stellar Spectra, Concentration (Composition), Continuous Spectra, Line Spectra, Stellar Structure, Stellar Temperature
Scientific paper
Observational data on the postflare behavior of chromospheric emission lines in UV Cet type flare stars are reviewed, and theoretical calculations based on the chromospheric-cooling model of Gurzadian (1977) are performed to help explain them. Consideration is given to the 280-nm Mg II, H and K Ca II, H, He, and faint emission lines; the mass concentrations in the chromosphere; the light-curve sequence of the lines; variations of ionization in the chromosphere; and a possible correlation between chromospheric concentration and flare frequency. The results are presented in tables and graphs, and a tentative linear frequency/concentration relation is derived from data on four flare stars. It is estimated on this basis that as the flare frequency approaches zero, the chromospheric concentration approaches a minimum of 7 x 10 to the 10th/cu cm.
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