Search for dissertations about: "mass-loss"

Showing result 1 - 5 of 64 swedish dissertations containing the word mass-loss.

  1. 1. Molecules and Dust around AGB stars : Mass-loss rates and molecular abundances

    University dissertation from Stockholm : Department of Astronomy, Stockholm University

    Author : Sofia Ramstedt; Stockholms universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; AGB stars; mass-loss; circumstellar abundances; NATURAL SCIENCES Physics Astronomy and astrophysics Formation and development of stars; NATURVETENSKAP Fysik Astronomi och astrofysik Stjärnors bildning och utveckling; Astronomy; astronomi;

    Abstract : 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. READ MORE

  2. 2. Stellar Winds of Cool Giants Investigating the Mass-Loss Mechanism of AGB Stars

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Sofie Liljegren; Uppsala universitet.; [2018]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; late-type stars; AGB stars; stellar winds; stellar atmospheres; dust; stellar pulsation; hydrodynamics; radiative transfer;

    Abstract : Asymptotic giant branch (AGB) stars are luminous cool giants of low to intermediate mass that are strongly pulsating and non-spherical, with heavy mass loss through a stellar wind. The mass loss makes these stars important for galactic chemistry, as the wind enriches the interstellar medium with new elements and dust, and it determines the final fate of these stars. READ MORE

  3. 3. On the Winds of Carbon Stars and the Origin of Carbon A Theoretical Study

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Lars Mattsson; Uppsala universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; AGB stars; carbon stars; mass loss; stellar winds; circumstellar matter; cosmic dust; stellar evolution; nucleosynthesis; galactic chemical evolution; NATURAL SCIENCES Physics Astronomy and astrophysics; NATURVETENSKAP Fysik Astronomi och astrofysik; Astronomy; Astronomi; Fysik; Physics;

    Abstract : Carbon is the basis for life, as we know it, but its origin is still largely unclear. Carbon-rich Asymptotic Giant Branch (AGB) stars (carbon stars) play an important rôle in the cosmic matter cycle and may contribute most of the carbon in the Galaxy. READ MORE

  4. 4. Asymptotic Giant Branch stars viewed up-close and far-off The physics, chemistry, and evolution of their circumstellar envelopes

    University dissertation from Stockholm : Department of Astronomy, Stockhoom University

    Author : Matthias Maercker; Stockholms universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; AGB stars; evolution; mass-loss; abundances; NATURAL SCIENCES Physics Astronomy and astrophysics Astronomy; NATURVETENSKAP Fysik Astronomi och astrofysik Astronomi; astronomi; Astronomy;

    Abstract : 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. READ MORE

  5. 5. Companion wind shaping in binaries involving an AGB star

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Lam Doan; Sofia Ramstedt; Eric Lagadec; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; AGB and post-AGB stars; mass-loss; radio lines; binaries; wind shaping; Astronomy; Astronomi;

    Abstract : Stars of initial masses between 0.8-8 M☉ will become "asymptotic giant branch" (AGB) stars during the final stages of their evolution. During this phase, the stars are characterized by low velocity and high-density winds. READ MORE