Ara es mostren els items 14-33 de 47

    • Exploding stars: the gamma-ray signature of type Ia supernovae 

      Isern Vilaboy, Jordi; Gomez, J.; Bravo Guil, Eduardo (Istituto Nazionale di Astrofisica, 1996-12)
      Article
      Accés obert
      Type Ia supenovae are commonly thought to be the outcome of the thermonuclear explosion of a white dwarf in a binary system. Nevertheless, there is no agreement on the scenarios (double degenerates, symbiotics stars ...) ...
    • Gamma rays from Type Ia supernova SN 2014j 

      Churazov, Eugene; Sunyaev, Rashid; Isern Vilaboy, Jordi; Bikmaev, I; Bravo Guil, Eduardo; Chugai, Nikolai; Grebenev, Sergei; Jean, Pierre; Knodlseder, Jurgen; Lebrun, François; Kuulkers, Eric (2015-10-08)
      Article
      Accés obert
      The whole set of INTEGRAL observations of Type Ia supernova SN 2014J, covering the period 19–162 days after the explosion, has been analyzed. For spectral fitting the data are split into early and late periods covering ...
    • Gamma-ray emission from SN2014J near maximum optical light 

      Isern Vilaboy, Jordi; Jean, Pierre; Bravo Guil, Eduardo; Knodlseder, Jurgen; Lebrun, François; Churazov, Eugene; Sunyaev, Rashid; Domingo, Alberto; Badenes Montoliu, Carles; Hartmann, Dieter, H; Hoeflich, Peter; Renaud, Matthieu; Soldi, Simona; Elias Rosa, Nancy; Hernanz, Margarita; Domínguez Aguilera, Inmaculada; García Senz, Domingo; Lichti, G.G.; Vedrenne, G.; Von Ballmoos, Peter (EDP Sciences, 2016-04)
      Article
      Accés obert
      Context. The optical light curve of Type Ia supernovae (SNIa) is powered by thermalized gamma-rays produced by the decay of 56Ni and 56Co, the main radioactive isotopes synthesized by the thermonuclear explosion of a C/O ...
    • Gamma-ray emission from type Ia supernovae 

      Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Hirschmann, Alina; García Senz, Domingo (2004-02)
      Article
      Accés restringit per política de l'editorial
      The explosion mechanism associated with thermonuclear supernovae is still a matter of debate. Since huge amounts of radioactive elements are synthesized during such explosions, it is possible to use the associated γ-ray ...
    • Gamma-ray spectrum of type Ia supernovae 

      Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Gómez, J.; García Senz, Domingo; Jean, Pierre (1999-12)
      Article
      Accés restringit per política de l'editorial
      The explosion mechanism associated with thermonuclear supernovae (SNia) is still a matter of debate. In this paper we examine the 'f-ray emission of the radioactive debris predicted by the different theoretícal models ...
    • 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
      Accés obert
      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 ...
    • High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs 

      Lorén Aguilar, Pablo; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (2009-06)
      Article
      Accés obert
      Context. The coalescence of two white dwarfs is the final outcome of a sizeable fraction of binary stellar systems. Moreover, this process has been proposed to explain several interesting astrophysical phenomena. Aims. ...
    • Is WD0433+270 an iron-core white dwarf? 

      Catalan, S.; Ribas Vila, Immaculada; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (PoS - Proceedings of Science, 2007)
      Text en actes de congrés
      Accés obert
      We study a common proper motion pair formed by a white dwarf (WD0433+270) and a mainsequence star (BD+26 730) that apparently has been classified as a member of the Hyades open cluster. Previous studies of the white dwarf ...
    • 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 (2011-08-20)
      Article
      Accés restringit per política de l'editorial
      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 ...
    • Observation of SN2011fe with INTEGRAL - I : pre-maximum phase 

      Isern Vilaboy, Jordi; Jean, Pierre; Bravo Guil, Eduardo; Diehl, Roland; Knödlseder, Jurgen; Domingo, A.; Hirschmann, Alina; Hoeflich, Peter; Lebrun, F.; Renaud, M.; Soldi, Simona; Elias-Rosa, Nancy; Hernanz Carbó, Margarita; Kulebi, Baybar; Zhang, X.; Badenes Montoliu, Carles; Domínguez, Inmaculada; García Senz, Domingo; Jordi, Carme; Lichti, G.; Vedrenne, G.; von Ballmoos, Peter (2013-04)
      Article
      Accés obert
      Context. SN2011fe was detected by the Palomar Transient Factory in M101 on August 24, 2011, a few hours after the explosion. From the early optical spectra it was immediately realized that it was a Type Ia supernova, thus ...
    • On the internal composition of white dwarfs 

      Isern Vilaboy, Jordi; Bravo Guil, Eduardo; García-Berro Montilla, Enrique; Domínguez, Inmaculada; Salaris, M. (2001-05)
      Article
      Accés restringit per política de l'editorial
    • On the origin of high-field magnetic white dwarfs 

      García-Berro Montilla, Enrique; Torres Gil, Santiago; Lorén Aguilar, Pablo; Aznar Siguan, Gabriela; Camacho Díaz, Judit; Kulebi, Baybar; Isern Vilaboy, Jordi; Althaus, Leandro Gabriel; Corsico, Alejandro H. (Astronomical Society of the Pacific, 2013-01-01)
      Comunicació de congrés
      Accés obert
      Every two years, white dwarf researchers and enthusiasts meet to exchange their knowledge and discuss recent developments in white dwarf theory and observations. These proceedings are from the 18th European White Dwarf ...
    • On the photometric homogeneity of type IA supernovae 

      Bravo Guil, Eduardo; Domínguez, Inmaculada; Isern Vilaboy, Jordi; Canal Corretger, Ramon; Höflich, P.; Labay, Javier (1993-03)
      Article
      Accés obert
      The dependence of the characteristics of the light curves of Type Ia supernovae on the ignition density of the progenitor white dwarf is studied with the aid of two models of propagation of the thermonuclear burning front: ...
    • Oxygen neutronization in accreting white dwarfs 

      Bravo Guil, Eduardo; Isern Vilaboy, Jordi; Labay, Javier; Canal Masgoret, Ramon (1983)
      Article
      Accés obert
      Solid carbon-oxygen white dwarf cores have been shown to be likely initial configurations for collapse to neutron star densities. Solidification seems to entail carbon/oxygen separation, with oxygen settling at the star's ...
    • Revisiting the luminosity function of single halo white dwarfs 

      Cojocaru, Elena Ruxandra; Torres Gil, Santiago; Althaus, Leandro G.; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (EDP Sciences, 2015-09-01)
      Article
      Accés obert
      Context. White dwarfs are the fossils left by the evolution of low- and intermediate-mass stars, and have very long evolutionary timescales. This allows us to use them to explore the properties of old populations, like the ...
    • SIXE: A Payload for MINISAT-02 

      Gómez, J.; Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Giovannelli, F.; Padula, C.L. (1998-01)
      Article
      Accés restringit per política de l'editorial
      A description of the X-ray instrument SIXE proposed for the MINISAT-02 mission is presented. The description includes the scientific goals and instrument performances.
    • Testing the initial-final mass relationship of white dwarfs 

      Catalán Ruiz, Silvia; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique; Ribas Canudas, Ignasi (2009-06-01)
      Article
      Accés restringit per política de l'editorial
      In this contribution we revisit the initial-final mass relationship of white dwarfs, which links the mass of a white dwarf with that of its progenitor in the main-sequence. Although this function is of paramount importance ...
    • 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
      Accés obert
      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 ...
    • 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 (2008)
      Article
      Accés obert
    • The contribution of Type IA supernovae to the galactic iron abundances 

      Bravo Guil, Eduardo; Isern Vilaboy, Jordi; Canal Corretger, Ramon (1993-03)
      Article
      Accés obert
      The thermonuclear explosion of a mass-accreting white dwarf in a close binary system is thought to be at the origin of Type Ia supernovae. Standard models, which ignite carbon at densities higher than 2-4 x 10 exp 9 g/cu ...