Title: The Star Formation History of the Sagittarius dwarf galaxy and streams

Abstract:
The Sagittarius (Sgr) dwarf spheroidal galaxy and associated stellar streams provide valuable 
tools for the study of galaxy formation and evolution in the more massive surviving satellites of 
the MW as well as giving insights into the (dark) properties and assembly of the Galactic 
halo. Using data from the Sloan Digital Sky Survey (SDSS), we construct accurate photometric 
colour-magnitude diagram (CMDs) and spectroscopic metallicity distribution functions for the 
Sagittarius stream in SDSS stripe 82. Through the accurate modelling of the CMDs, we 
determine the Star Formation History of the Sgr stream as a function of angle along the stream 
orbit and discuss the mix of stellar populations present in different wraps of the stream. This will 
be compared to the SFH of the Sgr core as well as the age-metallicity relation of Sgr globular 
cluster to determine when different parts of the stream were stripped from the host 
galaxy. Furthermore, from spectroscopic abundances of stars in the Sgr stream, we construct 
the metallicity and alpha-element distribution of Sagittarius as a function of age. These can be 
directly compared to abundances in the Galactic halo and other LG dSphs, to explore the range 
of masses of dwarf galaxies that could have contributed to the formation of the MW stellar halo 
system.