Computer Science
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ycat..33840491c&link_type=abstract
VizieR On-line Data Catalog: J/A+A/384/491. Originally published in: 2002A&A...384..491C; 2003A&A...397..987C
Computer Science
Stars: Nearby, Stars: G-Type, Photometry: Ubvri, Abundances, Radial Velocities, Rotational Velocities, Equivalent Widths
Scientific paper
We present the results of high-resolution spectroscopic and high-precision photometric observations on a sample of 129 late-F and G-type nearby stars selected on the basis of their large rotational velocity. Using also data from the Hipparcos satellite, CORAVEL and from the ROSAT satellite database, we infer spectral types, compute radial velocities, vsini, Li abundances and X-ray luminosities and investigate the single or binary nature of the sample stars. Such a careful analysis of our sample shows a large fraction of binaries (~62%) and of young single disk stars. In particular, at least 9 stars can be considered bona-fide PMS or ZAMS objects, and 30 stars are identified as SBs for the first time. Information on the presence of Ca II K emission and on optical variability is given for some of the stars of the sample.
The photometry has been obtained at the European Southern Observatory (ESO-La silla, Chile) during several observing runs (19/11-03/12 1993, 24/11-04/12 1994, 15-28/01/1995 and 1-12/10/1995), by using the 50cm ESO telescope.
The figures were published in paper II.
(5 data files).
Andersen Jeppe J.
Cutispoto Giuseppe
de Medeiros Jose Renan
Pasquini Luca
Pastori Livio
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