Now showing items 1-9 of 9

  • Com les Varietats Invariants formen Espirals i Anells en Galàxies barrades 

    Romero Gómez, Mercè; Sánchez-Martín, Patricia; Masdemont Soler, Josep (2014)
    Article
    Open Access
    L'espectacularitat de les galàxies barrades consisteix no solament en la presència de la barra, allargada en el centre de la galàxia, sinó també en els braços espirals o anells que es desenvolupen en les parts exteriors. ...
  • Equivalence of Boltzmann and moment equations 

    Cubarsí Morera, Rafael (2010-10-28)
    Article
    Open Access
    The closure problem for the stellar hydrodynamic equations is studied by describing the family of phase space density functions, for which the collisionless Boltzmann equation is strictly equivalent to a finite subset of ...
  • High-proper-motion white dwarfs and halo dark matter 

    Torres Gil, Santiago; García-Berro Montilla, Enrique; Burkert, Andreas; Isern Vilaboy, Jordi (Blackwell, 2002-11)
    Article
    Open Access
    The interpretation of the old, cool white dwarfs recently found by Oppenheimer et al. is still controversial. Whereas these authors claim that they have finally found the elusive ancienthalo white dwarf population that ...
  • Is the metallicity of their host galaxies a good measure of the metallicity of Type Ia supernovae? 

    Bravo Guil, Eduardo; Badenes Montoliu, Carles (2011-06)
    Article
    Open Access
    The efficient use of Type Ia supernovae (SNIa) for cosmological studies requires knowledge of any parameter that can affect their luminosity in either systematic or statistical ways. Observational samples of SNIa commonly ...
  • Precessing models and eventual links with galaxy warps 

    Barajas Pichardo, Daniel (Universitat Politècnica de Catalunya, 2010-11)
    Master thesis
    Open Access
    The Restricted Three Body problem is a basic model in celestial mechanics and it has been extensively used in the design of some spatial missions. Sometimes, the designers of these missions consider other similar models ...
  • Rings and spirals in barred galaxies III. Further comparisons and links to observations 

    Masdemont Soler, Josep; Bosma, A.; Romero Gómez, Mercè; Athanassoula, Evangelie (2010)
    Article
    Restricted access - publisher's policy
    In a series of papers, we propose a theory to explain the formation and properties of rings and spirals in barred galaxies. The building blocks of these structures are orbits guided by the manifolds emanating from the ...
  • The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo 

    Camacho Díaz, Judit; Torres Gil, Santiago; Isern Vilaboy, Jordi; Althaus, Leandro Gabriel; García-Berro Montilla, Enrique (2007-06-13)
    Article
    Open Access
    Context. The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. White dwarfs have been proposed to explain these results and, hence, to contribute significantly ...
  • Three kinematical methods to identify local galactic structures 

    Cubarsí Morera, Rafael; Alcobé López, Santiago; Vidojevic, S.; Ninkovic, S. (2010-05)
    Conference lecture
    Open Access
    Method one: by combining a sampling parameter related to an isolating integral of the stellar motion, an optimisation of the mixture approach, and a maximisation of the partition entropy for the constituent populations ...
  • Un planeta con dos soles. ¿Tatooine o Kepler-16b? 

    Moreno Lupiáñez, Manuel (2011-10-25)
    External research report
    Open Access
    La existencia de un mundo con atardeceres dobles, similar al que se mostró en la película "Star Wars" hace más de 30 años, ya es un hecho científico. La misión Kepler, de la Nasa, ha logrado la primera detección directa ...