Avancerad sökning

Hittade 4 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Mass Loss of Evolved Stars : Improving Mass-Loss Rates and Distances

    Författare :Miora Andriantsaralaza; Paul Barklem; Elvire De Beck; Susanne Höfner; Jacco van Loon; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; AGB stars; Mass loss; Distance; Circumstellar matter; Radio interferometry; Stellar evolution; Fysik med inriktning mot astrofysik; Physics with specialization in Astrophysics;

    Sammanfattning : In the final stages of their lives, low to intermediate-mass stars enter the Asymptotic Giant Branch (AGB) phase, where they experience significant mass loss through dusty stellar winds. This mass loss is pivotal, not only for the chemical enrichment of the interstellar medium, setting the stage for new stars and planets to form, but also in dictating the evolution and the ultimate fate of the stars themselves. LÄS MER

  3. 2. Metallicity determination of M dwarfs

    Författare :Sara Lindgren; Ulrike Heiter; Ansgar Reiners; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stars: low mass - stars: abundances; fundamental parameters - technique: spectroscopic; photometric - planets and satellites: formation;

    Sammanfattning : M dwarfs constitute around 70% of all stars in the local Galaxy. Their multitude together with their long main-sequence lifetimes make them important for studies of global properties of the Galaxy such as the initial mass function or the structure and kinematics of stellar populations. LÄS MER

  4. 3. Characterization and analysis of the astrometric errors in the global astrometric solution for Gaia

    Författare :Berry Holl; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astrometry; Catalogs; Methods: data analysis; statistical; numerical; analytical; Space vehicles: instruments; Instrumentation: detectors;

    Sammanfattning : The space astrometry mission Gaia, planned for launch in 2013 by the European Space Agency (ESA), will provide the most comprehensive and accurate catalogue of astrometric data for galactic and astrophysical research in the coming decades. It will observe roughly one billion stars, quasars and other point like objects for which the five astrometric parameters (position, parallax and proper motion) will be determined. LÄS MER

  5. 4. Intima samhällsvisioner : Sporten mellan minimalism och gigantism

    Författare :Fredrik Schoug; Avdelningen för etnologi; []
    Nyckelord :HUMANIORA; HUMANITIES;

    Sammanfattning : Ambitions and ClarificationsThe book takes its point of departure in the "intimate visions of society" that are significant of contemporary social life. This concept refers to the tendency to apprehend good social relations as personal, close and warm, while bad relations correspondingly are perceived as impersonal, cold, distant and alienated. LÄS MER