Theodora Xylaki

Theodora Xylaki-Dornbusch  (Greek)

xylaki @ mpia.de

Wide–field surveys for metal–poor stars of the Galactic halo and their chemical
composition

According to the Standard Big Bang (SBB) theory, the elements that formed during
the Nucleosynthesis Epoch of the Big Bang (BB) timeline were hydrogen and helium
isotopes, as well as some lithium (7Li). That is the reason why astronomers consider stars that
have low metal abundances in their atmospheres (metal–poor stars) to be old, something that
has also been corroborated by observations (e.g. damped Lyman–α systems). Thus, the study
of metal–poor stars –which are rare objects– corresponds to the study of objects at high
redshift. That makes them very interesting, since they can provide clues to further our
understanding of several topics, such as: the nature of the BB and the first stars, the IMF of
the first stars and the astrophysical site(s) of neutron–capture element production. In this
project we aim at finding and characterizing metal–poor stars using wide field surveys such as
Gaia.


Supervisors:  Karin Lind (MPIA), Norbert Christlieb (LSW)

 
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