Computer Science
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..545c&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 545-548
Computer Science
8
Scientific paper
A volume limited and absolute magnitude limited sample of A-type dwarfs within 125 parsecs of the Sun is searched for inhomogeneities in the density-velocity space, expecting some signatures of the cluster melting, phase mixing and possibly of the disc heating mechanisms. This sample has been wavelet analysed to find a-periodic structures in both 3-d position and 2-d velocity distributions. In the 3-d space of positions, known open clusters (Hyades, Coma and Cr285), concentration of association stars (Lupus-Centaurus) and two new significant concentrations are identified at (l,b)=(97 deg, +56 deg) and (l,b)=(56 deg,-35 deg). The sample is relatively well-mixed in the position space since no more than 7 per cent of the stars belong to structures with coherent kinematics. Only two components of the velocity vectors are provided by Hipparcos measurements. However the missing component can be obtained for stars in streams by a convergent point method. The multi-scale analysis exhibits the strong structuring of the reconstructed (U,V) velocity distributions. Four major groups (among them Hyades, Pleiades and Sirius superclusters) are found to be sub-structured in a cascade of tiny velocity clumps.
Bienayme Olivier
Chereul Emmanuel
Creze Michel
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