Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..881c&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
Spectroscopy, Photometry, Li Abundances, X-Ray, Activity
Scientific paper
We present the results of high-resolution spectroscopy and high-precision photometry on a sample of 110 fast rotating late-F and G-type nearby stars. We infer spectral types, compute radial velocities, v sin i, Li abundances and X-ray luminosities of these stars. We find statistically higher Li abundances and activity levels than for samples of field stars with similar characteristics but slower rotation. We find a large fraction of binaries (≃ 62%) and of young single disk stars. At least 8 single stars can be considered bona-fide PMS or ZAMS objects, while 30 stars are identified as SBs for the first time. Surprisingly, we also find al least 3 rapid rotating single MS stars with a very low Li abundance. The results on our sample confirm the presence of young very active stars close to the Sun, in agreement with recent findings coming from UV and X-ray surveys.
Andersen Jeppe J.
Cutispoto Giuseppe
de Medeiros Jose Renan
Pasquini Luca
Pastori Livio
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