Exploració per autor "Isern Vilaboy, Jordi"

Ara es mostren els items 30-47 de 47

    • 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 ...

    • The effects of metallicity on the Galactic disk population of white dwarfs 

      Cojocaru, Elena Ruxandra; Torres Gil, Santiago; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (2014-06)
      Article
      Accés obert
      Context. It has been known for a long time that stellar metallicity plays a significant role in the determination of the ages of the different Galactic stellar populations, when main sequence evolutionary tracks are employed. ...

    • The fate of CO white dwarfs that experience slow deflagrations 

      Bravo Guil, Eduardo; Domínguez, Inmaculada; Isern Vilaboy, Jordi (1999-10)
      Article
      Accés obert
      It has been suggested that the differences among the observational Type Ia supernovae (SNIa) set can be accounted for by invoking two regimes of propagation of combustion. Normal SNIa should be produced by rapid deflagrations ...

    • The gravitational wave emission from white dwarf interactions in globular clusters 

      Lorén Aguilar, Pablo; Lobo Gutiérrez, José Alberto; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (2009-03-01)
      Article
      Accés restringit per política de l'editorial
      In the dense central regions of globular clusters close encounters of two white dwarfs are relatively frequent. The estimated frequency is one or more strong encounters per star in the lifetime of the cluster. Such ...

    • The initial–final mass relationship of white dwarfs in common proper motion pairs and open clusters 

      Catalán, S.; Ribas Vila, Immaculada; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique; Allende Prieto, C. (Cambrigde University Press, 2007-07)
      Text en actes de congrés
      Accés obert
      We have studied white dwarfs in common proper motion pairs (CPMPs) to improve the semi-empirical initial–final mass relationship of white dwarfs. In this contribution, we re- port new results obtained from spectroscopic ...

    • The science of y-ray spectroscopy 

      Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Hirschmann, Alina (2006-11)
      Article
      Accés restringit per política de l'editorial
      The explosion mechanism associated with thermonuclear supernovae (SNIa) is still a matter of debate. Nevertheless, there is a wide agreement that high amounts of radioactive nuclei are produced during these events, that ...

    • The white dwarf cooling sequence of NGC 6791: an unique tool for stellar astrophysics 

      García-Berro Montilla, Enrique; Torres Gil, Santiago; Renedo Rouco, Isabel; Camacho Díaz, Judit; Althaus, Leandro Gabriel; Córsico, Alejandro Hugo; Salaris, Maurizio; Isern Vilaboy, Jordi (2011)
      Article
      Accés obert
      Context. NGC 6791 is a well-studied, metal-rich open cluster that is so close to us that it can be imaged down to luminosities fainter than that of the termination of its white-dwarf cooling sequence, thus allowing for ...

    • The white dwarf luminosity function II. The efect of the measurement errors and other biases 

      Torres Gil, Santiago; García-Berro Montilla, Enrique; Isern Vilaboy, Jordi (Royal Astronomical Society, 2007-09)
      Article
      Accés obert
      The disc white dwarf luminosity function is an important tool for studying the solar neighbourhood, since it allows the determination of several Galactic parameters, the most important one being the age of the Galactic ...

    • The white dwarf luminosity function – I. Statistical errors and alternatives 

      Geijo, Enrique M.; Torres Gil, Santiago; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (Royal Astronomy Society, 2006)
      Article
      Accés obert
      The white dwarf luminosity function is an important tool for the study of the solar neighbourhood, since it allows the determination of the age of the Galactic disc. Over the years, several methods have been proposed to ...

    • Type Ia supernovae and the 12C+12C reaction rate 

      Bravo Guil, Eduardo; Piersanti, Luciano; Domínguez, Inmaculada; Straniero, Oscar; Isern Vilaboy, Jordi; Escartín Vigo, José Antonio (2011-11-22)
      Article
      Accés obert
      Context. Even if the 12C+12C reaction plays a central role in the ignition of type Ia supernovae (SNIa), the experimental determination of its cross-section at astrophysically relevant energies (E ≲ 2 MeV) has never been ...

    • Unified one-dimensional simulations of gamma-ray line emission from type Ia supernovae 

      Milne, P.A.; Hungerford, A.L.; Fryer, C.L.; Evans, T.M.; Urbatsch, T.J.; Boggs, S E.; Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Hirschmann, A.; Kumagai, S.; Pinto, P.; The, L.S. (2004-10)
      Article
      Accés restringit per política de l'editorial
      The light curves of Type Ia supernovae (SNe Ia) are powered by gamma rays emitted by the decay of radioactive elements such as 56Ni and its decay products. These gamma rays are downscattered, absorbed, and eventually ...

    • White dwarf collisions, a promising scenario to account for meteoritic anomalies 

      Isern Vilaboy, Jordi; Bravo Guil, Eduardo (2018-09-04)
      Article
      Accés obert
      It is commonly accepted that collisions between white dwarfs (WD) are rare events that only occur in the dense interior of globular clusters or in the dense outskirts around the central galactic black holes, and are therefore ...

    • White dwarfs as astroparticle physics laboratories 

      Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (European Astronomical Society, 2007)
      Article
      Accés obert
      White dwarfs are well studied objects. The relative simplic- ity of their physics allows to obtain very detailed models which can be ultimately compared with their observed properties. Among them there is a specific ...

    • White dwarfs as physics laboratories: lights and shadows 

      Isern Vilaboy, Jordi; Torres Gil, Santiago; Rebassa Mansergas, Alberto (2022-01-31)
      Article
      Accés obert
      The evolution of white dwarfs is essentially a gravothermal process of cooling in which the basic ingredients for predicting their evolution are well identified, although not always well understood. There are two independent ...

    • White dwarfs with hydrogen-deficient atmospheres and the dark matter content of the Galaxy 

      Torres Gil, Santiago; Camacho Díaz, Judit; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (2010-02)
      Article
      Accés obert