Identification of Moving Groups in a Sample of Early-Type Main-Sequence Stars

Details Identification of Moving Groups in a Sample of Early-Type Main-Sequence Stars Identification of Moving Groups in a Sample of Early-Type Main-Sequence Stars

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..519f&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 519-524

Astronomy and Astrophysics

Astronomy

20

Scientific paper

The kinematic structure of young B5-F5 main-sequence stars in the solar neighbourhood is analysed using both accurate observational data - new astrometric Hipparcos data and complementary data from the ground - and several robust statistical methods. The coherence of the results obtained from the different methods (SEMMUL, kernel estimator, wavelets, dynamical clusters) allows us to definitively confirm the existence of the Eggen's moving groups and to determine, without any a priori knowledge, their mean characteristics in the 4-dimensional space (U,V,W, age). We find that mean velocity dispersion in the velocity component in the direction of the galactic rotation for Sirius, Pleiades, Hyades and Praesepe moving groups are in the range 3-8 km/s, a value larger than classically expected.

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