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Rotation and chromospheric emission among F, G, and K dwarfs of the Pleiades
Soderblom, David R.; Stauffer, John R.; Hudon, J. D.; Jones, Burton F.
AA(Space Telescope Science Inst., Baltimore, MD), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AC(Space Telescope Science Inst., Baltimore, MD), AD(Lick Observatory, Santa Cruz, CA)
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 85, no. 2, p. 315-346. (ApJS Homepage)
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NASA/STI Keywords:
Chromosphere, Dwarf Stars, H Alpha Line, Pleiades Cluster, Stellar Radiation, Stellar Rotation, Astronomical Photometry, F Stars, G Stars, Interstellar Extinction, K Stars, Radial Velocity, T Tauri Stars
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High-resolution echelle spectra of more than 100 F, G, and K dwarfs in the Pleiades are reported. Chromospheric activity in these stars is measured via comparisons of the profiles of H-alpha and the Ca II IR triplet to chromospherically inactive field stars. Consistent dereddened colors are determined from the available photometry and temperatures are derived. Most G and K dwarfs in the Pleiades rotate slowly, but about 20 percent of the stars are ultrafast rotators (UFRs). That fraction of UFRs is independent of color, and the highest rotation rates are found among the K dwarfs. The Pleiades exhibit a broad range in the strength of chromospheric emission at any one color. Most G and K dwarfs in the Pleiades show H-alpha and the IR triple in absorption, with filling in of the line cores.

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