Sökning: "main sequence stars"
Visar resultat 1 - 5 av 17 avhandlingar innehållade orden main sequence stars.
1. Interacting Giants and Compact Stars
Sammanfattning : This thesis is based on four papers dealing with various aspects of interactions in binary stars. Interactions between stars occur at nearly all stages of their evolution and can take many forms. LÄS MER
2. Magnetic fields of cool stars from near-infrared spectropolarimetry
Sammanfattning : Magnetic fields rule many physical processes in and around stars throughout their lifetime. All cool stars possess a magnetic field, likely generated by dynamo processes. In order to properly understand the evolution of cool stars, we need to understand their magnetism. LÄS MER
3. Studies of the S-type AGB star W Aquilae : The circumstellar envelope and the fain companion
Sammanfattning : Low- and intermediate-mass stars will all eventually enter the asymptotic giant branch (AGB) phase. AGB stars experience intense mass-loss, generating a significant fraction of the dust and molecular matter that enrichesthe ISM. AGB stars are also responsible for a the production of about half of all elements heavier than iron. LÄS MER
4. 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
5. Observations and analysis of water in molecular outflows and shocks
Sammanfattning : This thesis describes observations and analysis of molecular outflows from young stellar objects. The observations using the Odin satellite are described in Paper I, where a non-LTE radiative transfer code has been used to estimate the ortho-water abundance in seven molecular outflows and one super-nova remnant. LÄS MER