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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Proper motions of five OB stars with candidate dusty bow shocks in the Carina Nebula

Kiminki, Megan M., Smith, Nathan, Reiter, Megan, Bally, John 06 1900 (has links)
We constrain the proper motions of five OB stars associated with candidate stellar wind bow shocks in the Carina Nebula using Hubble Space Telescope ACS imaging over 9-10 yr baselines. These proper motions allow us to directly compare each star's motion to the orientation of its candidate bow shock. Although these stars are saturated in our imaging, we assess their motion by the shifts required to minimize residuals in their airy rings. The results limit the direction of each star's motion to sectors less than 90 degrees wide. None of the five stars are moving away from the Carina Nebula's central clusters as runaway stars would be, confirming that a candidate bow shock is not necessarily indicative of a runaway star. Two of the five stars are moving tangentially relative to the orientation of their candidate bow shocks, both of which point at the OB cluster Trumpler 14. In these cases, the large-scale flow of the interstellar medium, powered by feedback from the cluster, appears to dominate over the motion of the star in producing the observed candidate bow shock. The remaining three stars all have some component of motion towards the central clusters, meaning that we cannot distinguish whether their candidate bow shocks are indicators of stellar motion, of the flow of ambient gas or of density gradients in their surroundings. In addition, these stars' lack of outward motion hints that the distributed massive-star population in Carina's South Pillars region formed in place, rather than migrating out from the association's central clusters.
12

The physics and evolution of small molecular clouds in nebulæ : globulettes as seeds for planets?

Dittrich, Karsten January 2010 (has links)
Globulettes have recently been found in the Rosette Nebula, the Carina Nebula and other nebulæ. They are expected to be seeds of brown dwarfs and free-floating planetary-mass objects. The size distribution in the Carina Nebula was found to follow a power-law, and the same power-function resulted in 880 +- 250 globulettes in total in the Rosette Nebula. Compared to the 145 observed objects in this nebula, many globulettes are beneath the resolution limit of the Nordic Optical Telescope, which was used to explore the Rosette Nebula. A simulation that arranged all these globulettes randomly in the nebula determined that some globulettes are captured by stars. They are believed to form into one or more planets, orbiting the star thereafter. The possibility that globulettes result into the formation of planets, orbiting a star, is some 4.75·10^2 per cent. According to this simulation, about 3.35·10^3 per cent of the stars with spectral type A to M host one or more planets that once have been globulettes. / <p>Validerat; 20101217 (root)</p>
13

Den ensamma sjöjungfrun : Om Carina Rydbergs jagberättande ur ett genreperspektiv / The Lonely Mermaid : On Identity Narration and Genre in the Autobiographical Works of Carina Rydberg

Andersson, Tamara January 2015 (has links)
The focus of this study is the two autobiographical novels Den högsta kasten (1997) and Djävulsformeln (2000) by Swedish author Carina Rydberg. Both novels generated lively public debate regarding how they ought to be read and understood, what genre they belonged to, and the ontological status of the narrating “I”. The aim is to investigate why the protagonist, Carina, is perceived as unintelligible by many readers and explore how she can be understood in relation to what constitutes an intelligible identity from a literary and cultural perspective. The novels, as well as their protagonist, are approached from the perspective of genre theory, the argument being that Carina’s unintelligibility is directly dependent on what genre she is read in relation to. In the first part of the thesis the ambiguities of autobiographical texts are discussed, and the narrative and protagonist are analyzed in relation to the autobiographical genre. In the second part of the thesis the consequences of reading the texts as examples of the Gothic with emphasis on monstrosity, the uncanny and sexual transgression are examined. The two readings demonstrate how interpretations of text and character are highly influenced by the reader's expectations connected to genre. Rydberg’s transgression of the norms of genre, gender, and identity leaves the reader with a contradictory set of genre-specific expectations, which in turn makes it difficult to understand and accept the protagonist. The main theme of both novels is Carina’s unsuccessful attempts to reconcile what she sees as two separate, essentially incompatible identities: woman and author. The final chapter includes a comparative study in which Rydberg’s novels are linked to works by other Swedish female writers, both past and contemporary, to demonstrate that the conflict of woman versus author is a common problem for female writers. The thesis closes with a discussion about the possibility of placing Rydberg in a specifically female literary tradition and demonstrate how a feminist analysis can make the unintelligible intelligible.
14

Upplevd trygghet i det offentliga rummet

Karlborg, Emil, Oskarsson, Hjalmar January 2018 (has links)
No description available.

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