Fine structure in the phase space distribution of nearby subdwarfs

Details Fine structure in the phase space distribution of nearby subdwarfs Fine structure in the phase space distribution of nearby subdwarfs

2005-12-12

arxiv.org/abs/astro-ph/0512296v1

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, 2 tables, accepted by Astron. Astrophys

Scientific paper

10.1051/0004-6361:20054355

We analysed the fine structure of the phase space distribution function of nearby subdwarfs using data extracted from various catalogues. Applying a new search strategy based on Dekker's theory of galactic orbits, we found four overdensely populated regions in phase space. Three of them were correlated with previously known star streams: the Hyades-Pleiades and Hercules streams in the thin disk of the Milky Way and the Arcturus stream in the thick disk. In addition we find evidence for another stream in the thick disk, which resembles closely the Arcturus stream and probably has the same extragalactic origin.

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