Essays about: "Spectroscopy and stars"

Showing result 16 - 20 of 32 essays containing the words Spectroscopy and stars.

  1. 16. Investigating super-Eddington accretion flows in Ultraluminous X-ray sources

    University essay from Luleå tekniska universitet/Rymdteknik

    Author : Andrés Gúrpide Lasheras; [2018]
    Keywords : Accretion; X-ray binaries; Black holes; Neutron Stars; Ultraluminous X-ray sources;

    Abstract : It is now widely known that most of the large galaxies we observe (e.g. the Milky Way) host in their center a supermassive black hole ($10^{6}-10^{9}$ $M_\odot$). READ MORE

  3. 17. Spectral investigation of the globular cluster M30

    University essay from Uppsala universitet/Observationell astrofysik

    Author : Scheutwinkel Kilian Hikaru; [2018]
    Keywords : M30; globular cluster; spectroscopy;

    Abstract : Globular cluster studies suggest that a signature in the spectra of RGB stars in a globular cluster are anti-correlations in Mg-Al and Na-O. In this work, a small sample of 12 RGB stars of the globular cluster M30 is investigated using VLT-UVES high-resolution spectrograph. READ MORE

  4. 18. Forbidden oxygen in the Milky Way disk

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation

    Author : Asma Sahli; [2017]
    Keywords : Physics and Astronomy;

    Abstract : Oxygen is produced inside massive stars and dispersed into the interstellar medium mainly through type II supernovae explosions. This element, which is the third most abundant one in the Universe, plays an important role in tracing the Galactic chemical history and evolution. READ MORE

  5. 19. Mapping the present-day chemical abundance structure of the Solar neighbourhood: O & Si

    University essay from Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation; Lunds universitet/Astronomi - Genomgår omorganisation

    Author : Kristiina Verro; [2017]
    Keywords : astrophysics; stellar spectroscopy; abundance analysis; solar neighbourhood; massive stars; Galaxy; Physics and Astronomy;

    Abstract : Context. Large scale chemical abundance gradients in the Galactic disks, small-scale abundance structures, and the mean chemical abundance values in the Solar vicinity, are important constraints to Galactic chemo-dynamical formation and evolution models. READ MORE

  6. 20. X-ray Spectroscopy of Distant Active Galactic Nuclei

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Charlie Börjeson; Julia Cohen; [2017]
    Keywords : ;

    Abstract : The physical structure and behaviour of stars have been studied extensively throughout centuries.In contrast, the existence of objects now known as Active Galaxies has only been established since a couple of decades. READ MORE