2.
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...
3.
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...
4.
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...
10.
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...