High-Resolution Spectroscopy of Some Very Active Southern Stars

Details High-Resolution Spectroscopy of Some Very Active Southern Stars High-Resolution Spectroscopy of Some Very Active Southern Stars

1998-03-10

arxiv.org/abs/astro-ph/9803111v1

Astronomical Journal, July, 1998

Astronomy and Astrophysics

Astrophysics

25 figures, 3 tables

Scientific paper

10.1086/300423

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-alpha 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 ages of 10 to 15 Myr. Two of them, HD 202917 and HD 222259, also appear to have a kinematical association with the pre-main sequence multiple system HD 98800.

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