Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..45t&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 more reliable characterization of the local stellar kinematic of Hipparcos data makes a very important contribution to the understanding of the structure and evolution of the Milk Way. Here, from a selected sample of about 22000 Hipparcos stars according to the criteria adopted by Mignard (2000) we investigate and discuss the possibilities to represent the probability distribution of peculiar velocities by an addition of two Gaussians. To select our sample we adopted the same criteria by Mignard (2000): only single stars; stars between 0.1 and 2.0 Kpc; level of completeness of Hipparcos stars, based on Tycho catalogue as function of galactic latitude, magnitude and colors, greater than 70%; spectral type. We verify that for the early type stars the results are not significantly different from the classical treatment with only one Gaussian but for the late type stars we can see easily the better representation of the distribution by two Gaussian instead one. Mignard F., 2000, A&A 354, 522-536
de Souza Ronaldo E.
Teixeira Ramachrisna
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