Populations among High-Velocity Early-Type Stars

Details Populations among High-Velocity Early-Type Stars Populations among High-Velocity Early-Type Stars

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..595r&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 595-598

Computer Science

1

Stars: Early Type, Stars: Blue Horizontal Branch, Stars: High-Velocity

Scientific paper

Previous studies indicate the existence of early-type stars located far from the galactic plane with ages, abundances and kinematics inconsistent with the standard models. In the aim of providing an insight into the different populations of early-type stars, a sample of high velocity stars in the solar neighbourhood has been gathered from the Hipparcos catalogue. Parallaxes and proper motions collected by the satellite together with complementary photometric and/or spectroscopic data allow us to study the kinematics of these stars and to separate the halo from the disk populations. We denote a striking trend for the high-velocity disk stars to go toward the galactic anticentre, suggesting that they do not belong to the tail of the usual Population I velocity distribution.

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