White Dwarfs in Local Star Streams

Details White Dwarfs in Local Star Streams White Dwarfs in Local Star Streams

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aj....141....5f&link_type=abstract

The Astronomical Journal, Volume 141, Issue 1, article id. 5 (2011).

Astronomy and Astrophysics

Astronomy

Galaxy: Kinematics And Dynamics, Solar Neighborhood

Scientific paper

We have studied the fine structure of the phase space distribution of white dwarfs in the solar neighborhood. White dwarfs have kinematics that are typical for the stellar population of the old thin disk of the Milky Way. Using a projection of the space velocities of stars onto vertical angular momentum components and eccentricities of the stellar orbits we demonstrate that stellar streams can be identified in the phase space distribution of the white dwarfs. These correspond to the well-known Sirius, Pleiades, and Hercules star streams. Membership of white dwarfs, which represent the oldest population in the Galaxy, in these streams lends support to the interpretation that the streams owe their existence to dynamical resonance effects of the stars with Galactic spiral arms or the Galactic bar, because these indiscriminately affect all stellar populations.

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