Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67...99t&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Jan.-Feb. 1990, p. 99-108. In Russian.
Astronomy and Astrophysics
Astronomy
2
Chromosphere, Main Sequence Stars, Stellar Activity, Stellar Coronas, Emission Spectra, Stellar Atmospheres, Stellar Evolution, Stellar Mass, Stellar Rotation
Scientific paper
On the basis of published data on emission fluxes in the cores of H and K Ca II lines and on rotation periods of 182 main sequence stars, the dependence of the degree of chromospheric activity on Rossby number reported by Noyes et al. (1984) is reconsidered. In contrast to previous studies, the results have very weak or even completely absent signs of saturation in stars with small Rossby numbers (predominantly late dwarfs). In the region of large Rossby numbers, the shape of the curve depends on the method of calculating Rossby numbers. Deviations of individual stars from a mean curve do not depend on the spectral type, but they are rather large and cannot be ascribed wholly to difference in the age and evolution rate.
Skochilov V. G.
Teplitskaya R. B.
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