Thesiss

In this thesis I study the magnetic activity of young stars via observations of stellar prominences on single stars and by applying the Zeeman Doppler imaging (ZDI) technique to map the magnetic fields and measure differential rotation of a young binary system. Stellar prominenc…

This thesis reports the isotopic compositions of different elements in a large number of presolar SiC and oxide grains in order to further increase our knowledge of nucleosynthesis in asymptotic giant branch (AGB) stars, the chemical evolution of the galaxy, and the lifetimes of…

Ancient settlements in Oman are frequently found where crops can be cultivated with groundwater distributed to fields by gravity flow. These irrigation systems are called aflāj (s. falaj), and they are still pivotal to community life: in 1997 over 3000 such systems were still in…

Comprehending the evolutionary history of the Milky Way can offer great insight into how both our home Galaxy and others form and grow. However, studying the Milky Way from our position embedded within it is difficult, and this challenge is exacerbated by the fact that our obser…

Stars, and collections of stars, encode rich signatures of stellar physics and galaxy evolution. With properties influenced by both their environment and intrinsic nature, stars retain information about astrophysical phenomena that are not otherwise directly observable. In the t…