Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101.1017y&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, Nov. 1989, p. 1017-1031.
Astronomy and Astrophysics
Astronomy
27
Binary Stars, Chromosphere, Stellar Activity, Stellar Atmospheres, Stellar Evolution, Stellar Rotation, Calcium, H Lines, K Lines, Tables (Data)
Scientific paper
A tabulation of measured values of the Ca II H and K (S) index are transformed to the original Mount Wilson definition of the index. The tabulation includes main-sequence, evolved, single, and tidally coupled (RS CVn) binary stars. The (S) indices are analyzed against Wilson's (1976) I(HK) intensity estimates, showing that Wilson's estimates are only a two-state indicator. Ca II H and K fluxes are computed and calibrated with published values of rotation periods. It is found that the single and binary stars are consistent with a single relationship between rotation and Ca II excess emission flux.
Ajir Fardin
Thurman Glenn
Young Arthur
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