Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..51u&link_type=abstract
Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech
Astronomy and Astrophysics
Astronomy
Scientific paper
The lists of stars selected spectroscopically by Vyssotsky at the Mc Cormick Observatory and the 4th Edition of the Catalog of Nearby Stars are two major sources of nearby stars, which complement each other and provide a kinematically unbiased sample of about 1200 nearby K-M dwarfs. With the addition of Hipparcos astrometry this stellar sample has become a useful tool in deriving kinematical properties of lower main sequence stars in the solar neighborhood. Until recently, however, the main limitation in observational data of this sample was the lack of radial velocity measures for fainter magnitude stars. Therefore our first goal was to remedy this deficiency by performing Coravel observations for one-third of the sample stars which had no radial velocity data. Using the Coravel spectrometer of Vilnius University Observatory, attached to the 1.6-m Kuiper Telescope at Steward Observatory and the 1.6-m telescope at Moletai Observatory (Lithuania), radial velocities have been recently measured for 475 K-M dwarfs, mostly of 11-12 mag. These observations, together with Hipparcos parallaxes and proper motions, are used to derive unbiased values of the kinematical parameters of nearby late dwarfs. The subsample includes a handful of high-velocity transients from the older stellar populations of the Galactic disk and at least 17 radial-velocity variables detected from repeated Coravel observations. An attempt is also made to estimate from these data the peculiar motion of the Sun relative to the LSR. Preliminary analysis shows that K-M dwarfs in our subsample have velocity distributions similar to those derived in previous studies of the volume-complete samples of lower main sequence stars.
Bartasiute Stanislava
Boyle Richard P.
Sperauskas Julius
Upgren Arthur R.
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