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rotation and chromospheric emission among f, g, and k dwarfs of the pleiadesHigh-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.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Soderblom, David R.
(Space Telescope Science Inst. Baltimore, MD, United States)
Stauffer, John R.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Hudon, J. D.
(Space Telescope Science Inst. Baltimore, MD, United States)
Jones, Burton F.
(Lick Observatory Santa Cruz, CA, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1993
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 85
Issue: 2
ISSN: 0067-0049
Subject Category
Distribution Limits