Sökning: "Astronomy"

Visar resultat 1 - 5 av 557 avhandlingar innehållade ordet Astronomy.

1. 1. High Resolution Transmission Spectroscopy of Exoplanets

   Författare :Ansgar Wehrhahn; Nikolai Piskunov; Ulrike Heiter; Jason Wright; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; astronomy; spectroscopy; Astronomy; Astronomi;

   Sammanfattning : A large number of exoplanets has been observed in the last three decades, but still for most of them we know comparatively little about the atmospheres of these distant planets. This is of particular interest as there exist types of planets that don't have an analogy in our own solar system, like hot Jupiters or super Earths. LÄS MER

3. 2. Taking possession of astronomy : Frontispieces and illustrated title pages in 17th-century books on astronomy

   Författare :Inga Elmqvist Söderlund; Margaretha Rossholm Lagerlöf; Karin Sidén; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Frontispiece; illustrated title page; astronomy; 17th century; allegory; engraving; illustrated book; Art; Konstvetenskap; konstvetenskap; Art History;

   Sammanfattning : The thesis is a survey of 291 frontispieces and illustrated title pages in European books on astronomy from the 17th century. It is a quantitative and qualitative survey of how motifs are related to consumption, identification and display. LÄS MER

4. 3. Chemical Abundance Analysis of Population II Stars : The Summary Includes a Background in General Astronomy

   Författare :Karin Jonsell; Bengt Gustafsson; Bengt Edvardsson; Paul Barklem; Christopher Sneden; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomy; Astronomy; Galactic evolution; Halo; Milky Way; Oxygen; r-element; s-element; Stellar abundances; Astronomi; Astronomy and astrophysics; Astronomi och astrofysik;

   Sammanfattning : We are made of stardust in the sense that most atomic nuclei around us have been formed by stars. Stars synthesise new elements and expel them to the interstellar medium, from which later new generations of stars are born. We can map this chemical evolution by analysing the atmospheric contents of old Galactic halo stars. LÄS MER

5. 4. Gas Production in Distant Comets

   Författare :Marcus Gunnarsson; F Peter Schloerb; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomy; Comets; Radio Astronomy; Molecular Spectroscopy; Coma Models; Astronomi; Astronomy and astrophysics; Astronomi och astrofysik; astronomi; Astronomy;

   Sammanfattning : Molecular spectroscopy at radio wavelengths is a tool well suited for studying the composition and outgassing kinematics of cometary comae. This is particularly true for distant comets, i.e. comets at heliocentric distances greater than a few AU, where the excitation of molecules is inefficient other than for rotational energy levels. LÄS MER

7. 5. Methods of Multi-Conjugate Adaptive Optics for Astronomy

   Författare :Ralf Flicker; Astronomi - Genomgår omorganisation; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Adaptive optics; anisoplanatism; laser guide stars; performance estimation; wavefront reconstruction; extremely large telescopes; optics; Electromagnetism; Elektromagnetism; acoustics; Astronomy; akustik; space research; optik; multi-conjugate; cosmic chemistry; Astronomi; rymdvetenskap; kosmisk kemi; Fysicumarkivet A:2003:Flicker;

   Sammanfattning : This work analyses several aspects of multi-conjugate adaptive optics (MCAO) for astronomy. The research ranges from fundamental and technical studies for present-day MCAO projects, to feasibility studies of high-order MCAO instruments for the extremely large telescopes (ELTs) of the future. LÄS MER