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Nomenclatura Unesco > (21) Astronomía y Astrofísica > (2101) Cosmología y cosmogonía
(2101.01) Estrellas dobles (2101.02) Enjambres o Cúmulos
(2101.03) Rayos Cósmicos (2101.04) Galaxias
(2101.05) Gravitación (2101.06) Nebulosas
(2101.07) Novas (2101.08) Púlsares
(2101.09) Quasares (2101.10) Estrellas
(2101.11) Evolución estelar y diagrama HR (2101.12) Composición estelar
(2101.13) Super-novas (2101.14) Estrellas variables
(2101.15) Fuentes de Rayos X (2101.99) Otras (especificar)

Mostrando recursos 1 - 20 de 31

1. Simulations of structure formation in the universe: hot vs. cold dark matter - Chover Lopez, Carlos
In the last century, new observational techniques and discoveries such as the Cosmic MicrowaveBackground Radiation have brought a new dimension of knowledge about theUniverse. Therefore new theories and models have been proposed to explain the observedUniverse. Computer simulations are a very important tool because they lay a bridge betweentheory, often over-simpli ed, and observations, which reveal the complexity of ourUniverse.In this thesis, it is given a review of observations including the most important discoveriesand results that help to describe the Universe and have been used to develop the modelsconsidered nowadays. The cosmological theory behind the large-scale structure formationis explained, from...

2. Nucleosynthesis during the merger of white dwarfs and the origin of R Coronae Borealis stars - Longland, Richard Leigh; Lorén Aguilar, Pablo; José Pont, Jordi; García-Berro Montilla, Enrique; Althaus, Leandro Gabriel; Isern Vilaboy, Jordi
Many hydrogen-deficient stars are characterized by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger episode between a helium and a carbon–oxygen white dwarf. In this Letter, we present a nucleosynthesis study of the merger of a 0.4M helium white dwarf with a 0.8M carbon–oxygen white dwarf, by coupling the thermodynamic history of Smoothed Particle Hydrodynamics particles with a post-processing code. The resulting chemical abundance pattern, particularly for oxygen and fluorine, is in qualitative agreement with the observed abundances in R Coronae Borealis...

3. The contribution of red dwarfs and white dwarfs to the halo dark matter - Torres Gil, Santiago; Camacho Díaz, Judit; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique

4. Funció de distribució de les velocitats de les estrelles a l'entorn del Sol - Cubarsí Morera, Rafael

5. Monte Carlo simulations of the post-common envelope white dwarf-main sequence binary population - Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique; Zorotovic, Monica; Schreiber, Mathias R.

6. Multibersoaren bila - Moreno Lupiáñez, Manuel

7. Local behaviour of evaporating stars and black holes around the total evaporation event - Fayos Vallés, Francisco; Torres Herrera, Ramon

8. On the scattering map and homoclinic connections between Lyapunov orbits - Cancalias Vila, Elisabet; Delshams Valdés, Amadeu; Masdemont Soler, Josep; Roldán González, Pablo
Homoclinic and heteroclinic connections between planar Lyapunov orbits of theSun-Earth and Earth-Moon models can be found by using their hyperbolicinvariant manifolds and Poincare section representations. These connections canbe classified in bifurcation families according to the range of values of theassociated Jacobi constant. In the formalism of invariant manifolds (as theaforementioned Jacobi constant changes) the foliation of all Lyapunov orbits isa Normally Hyperbolic Invariant Manifold. In this context, the homoclinicconnections correspond to the so called Scattering map of this NHIM intoitself. In this work, the Scattering map is studied as a possible way toformally describe the asymptotic connections arising from the...

9. Nucleosynthesis during the merger of white dwarfs and the origin of R Coronae Borealis stars - Longland, Richard Leigh; Lorén Aguilar, Pablo; José Pont, Jordi; García-Berro Montilla, Enrique; Althaus, Leandro Gabriel; Isern Vilaboy, Jordi
Many hydrogen-deficient stars are characterized by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger episode between a helium and a carbon–oxygen white dwarf. In this Letter, we present a nucleosynthesis study of the merger of a 0.4M helium white dwarf with a 0.8M carbon–oxygen white dwarf, by coupling the thermodynamic history of Smoothed Particle Hydrodynamics particles with a post-processing code. The resulting chemical abundance pattern, particularly for oxygen and fluorine, is in qualitative agreement with the observed abundances in R Coronae Borealis...

10. Study of LEO to GEO transfers via the L1 Sun-Earth or Earth-Moon libration points - Herrera Sucarrat, Elisabet
A geosynchronous Transfer Orbit (GTO) is a type of transfer around the Earth betweena low Earth orbit (LEO) and the geostationary orbit (GEO). After the launch to a LEO orbit, the orbit of spacecraft has the same inclination with respect to the equator, than the latitude of the launch site on the Earth where the spacecraft was launched. In order to transfer to a GEO orbit the inclination must be reduced to zero. During a GTO it may happen that because of many different problems, the spacecraft may not arrive to a GEO orbit and instead, it may remain in...

11. Funció de distribució de les velocitats de les estrelles a l'entorn del Sol - Cubarsí Morera, Rafael
Postprint (updated version)

12. Monte Carlo simulations of the post-common envelope white dwarf-main sequence binary population - Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique; Zorotovic, Monica; Schreiber, Mathias R.
Postprint (published version)

13. The contribution of red dwarfs and white dwarfs to the halo dark matter - Torres Gil, Santiago; Camacho Díaz, Judit; Isern Villaboy, Jordi; García-Berro Montilla, Enrique
Postprint (published version)

14. Multibersoaren bila - Moreno Lupiáñez, Manuel
Postprint (published version)

15. Local behaviour of evaporating stars and black holes around the total evaporation event - Fayos Vallés, Francisco; Torres Herrera, Ramon
Postprint (published version)

16. On the scattering map and homoclinic connections between Lyapunov orbits - Cancalias Vila, Elisabet; Delshams Valdés, Amadeu; Masdemont Soler, Josep; Roldán González, Pablo
Homoclinic and heteroclinic connections between planar Lyapunov orbits of theSun-Earth and Earth-Moon models can be found by using their hyperbolicinvariant manifolds and Poincare section representations. These connections canbe classified in bifurcation families according to the range of values of theassociated Jacobi constant. In the formalism of invariant manifolds (as theaforementioned Jacobi constant changes) the foliation of all Lyapunov orbits isa Normally Hyperbolic Invariant Manifold. In this context, the homoclinicconnections correspond to the so called Scattering map of this NHIM intoitself. In this work, the Scattering map is studied as a possible way toformally describe the asymptotic connections arising from the...

17. Funció de distribució de les velocitats de les estrelles a l'entorn del Sol - Cubarsí Morera, Rafael

18. Funció de distribució de les velocitats de les estrelles a l'entorn del Sol - Cubarsi Morera, Rafael
Postprint (updated version)

19. Monte Carlo simulations of the post-common envelope white dwarf-main sequence binary population - Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique; Zorotovic, Monica; Schreiber, Mathias R.

20. The contribution of red dwarfs and white dwarfs to the halo dark matter - Torres Gil, Santiago; Camacho Díaz, Judit; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique

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