Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..392v&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, Aug.-Sept. 1980, p. 392-396.
Astronomy and Astrophysics
Astronomy
57
Early Stars, Late Stars, Main Sequence Stars, Stellar Evolution, Astronomical Catalogs, Chromosphere, Cycles, H Lines, K Lines
Scientific paper
An analysis of the 91 main-sequence stars studied by Wilson (1978) shows that the behavior of young and old stars is fundamentally different. The stars are plotted in a log S,(B-V) diagram as vertical bars extending over the maximum range of their H-K variations in an eleven year span, revealing a bifurcation in the diagram for young and old stars. In addition, Wilson's time-resolved H-K flux observations for stars in each branch of the diagram are separately arranged in order of a (B-V) color index. The old stars are characterized by smooth, undulating variations in chromospheric H-K emission flux, with a rapidly varying component that increases in the maximum of the cycle; much like solar activity cycles. While young stars exhibit a chaotic behavior occurring over a considerable range of time cycles, with sun-like cycles being the rare exception.
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