Sökning: "abundances"
Visar resultat 1 - 5 av 179 avhandlingar innehållade ordet abundances.
1. Molecules and Dust around AGB stars : Mass-loss rates and molecular abundances
Sammanfattning : All stars with a stellar mass of about 0.8–8 MSun will end their lives as asymptotic giant branch (AGB) stars. Through their extensive mass loss the AGB stars constitutes an important source of nuclear processed material. LÄS MER
2. Dwarf and Subgiant Stars as Probes of Galactic Chemical and Dynamical Evolution
Sammanfattning : Stellar chemical abundances provide astronomers with vital information about the production of chemical elements. Some stars preserve the composition of the environment in which they were born on their surfaces. LÄS MER
3. Asymptotic Giant Branch stars viewed up-close and far-off : The physics, chemistry, and evolution of their circumstellar envelopes
Sammanfattning : The asymptotic giant branch (AGB) is the last stage of stellar evolution for stars with masses between 0.8-8 M(sun). This phase is characterised by an intense mass loss, which builds up a circumstellar envelope of dust and gas(CSE). It is through this process that the AGB stars contribute to the chemical evolution of galaxies. LÄS MER
4. Modelling of molecular clouds
Sammanfattning : .... LÄS MER
5. Interstellar molecules in the Magellanic clouds
Sammanfattning : .... LÄS MER