Stellar Phase-Space Structure and Dynamics in the Solar Neighbourhood

ISBN-13: 9783838103884 / Angielski / Miękka / 2009 / 192 str.

Rainer Klement

Opis

This PhD thesis describes the search for, and analysis of, substructure in the phase-space distribution of stars within 1-2 kpc of the Sun. Such sub­structure, caused by stellar streams, is an important diagnostic of stellar dynamics and hierarchical formation of the Galaxy. While possibly phase-mixed, stellar streams remain detectable as coherent features in the space of integrals of motion. This thesis describes the development of new search techniques in phase- and [Fe/H]-space to derive "effective" integrals of motion that are most suitable for a comparison with the observables. An application of these techniques to two new data sets which contain radial velocity- and proper motion estimates reveals significant "phase-space overdensities" of stars on similar orbits, of which some are already known, but at least five are described here for the first time. This thesis also outlines a preperatory study in the context of GAIA to measure the local gravitational potential on kpc scale.

O autorze

Rainer Klement, Dr.rer.nat.: studies of physics at the
Ruprecht-Karls-Universität Heidelberg with emphasis on
environmental physics. Afterwards graduation at the
Max-Planck-Institut für Astronomie on the subject of stellar
dynamics and kinematics in the
Solar neighbourhood. Since November 2008 working for the european
satellite mission GAIA.