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STScI Preprint #1228
We have obtained high-resolution echelle spectra of 18 solar-type stars that an earlier survey showed to have very high levels of Ca II H and K emission. Most of these stars belong to close binary systems, but 5 remain as probable single stars or well-separated binaries that are younger than the Pleiades on the basis of their lithium abundances and H emission. Three of these probable single stars also lie more than 1 magnitude above the main sequence in a color-magnitude diagram, and appear to have a kinematical association with the pre-main sequence multiple system HD 98800.
1)Space Telescope Science Institute, 3700 San Martin Drive
Baltimore, MD 21218, USA
2)Visiting Astronomer, Cerro Tololo Inter-American Observatory,
which is operated by the Association of Universities for Research
in Astronomy, Inc., under contract with the National Science
Foundation
3)Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,
Cambridge, MA 02138, USA