POSTER PAPER 5.10
Fast-rotating Nearby Solar-type Stars
G. Cutispoto, L. Pastori, L. Pasquini, J.R. de Medeiros, G. Tagliaferri, J. Andersen
Institute: Catania Astrophysical Observatory
Institute: Brera Astronomical Observatory
Institute: European Southern Observatory
Institute: University Federal of Rio Grande do Norte
Institute: Copenhagen Astronomical Observatory
Contact Email: gcutispoto@alpha4.ct.astro.it
Abstract:
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, vsini, 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.
Index Keywords: Spectroscopy; Photometry; Li Abundances; X-ray; Activity
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Manuscript submitted: 2001-Sep-04
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.