Now showing items 1-10 of 10

    • An asteroseismic constraint on the mass of the axion from the period drift of the pulsating da white dwarf star L19-2 

      Córsico, Alejandro H.; Romero, Alejandra Daniela; Althaus, Leandro G.; García-Berro Montilla, Enrique; Isern Vilaboy, Jordi; Kepler, S.O.; Miller Bartolami, Marcelo M.; Sullivan, Denis J. (2016-07-01)
      Article
      Open Access
      We employ an asteroseismic model of L19-2, a relatively massive (Msstarf ~ 0.75 M¿) and hot (Teff ~ 12 100 K) pulsating DA (H-rich atmosphere) white dwarf star (DAV or ZZ Ceti variable), and use the observed values of the ...
    • Can we reveal the core-chemical composition of ultra-massive white dwarfs through their magnetic fields? 

      Camisassa, María Eugenia; Raddi, Roberto; Althaus, Leandro G.; Isern Vilaboy, Jordi; Rebassa Mansergas, Alberto; Torres, Santiago; Córsico, Alejandro H.; Korre, Lydia (Oxford University Press, 2022-10-01)
      Article
      Open Access
      Ultra-massive white dwarfs (1.05M¿ . MWD) are particularly interesting objects that allow us to study extreme astrophysical phenomena such as type Ia supernovae explosions and merger events. Traditionally, ultra-massive ...
    • Forever young white dwarfs: When stellar ageing stops 

      Camisassa, María Eugenia; Althaus, Leandro G.; Torres Gil, Santiago; Córsico, Alejandro H.; Rebassa Mansergas, Alberto; Tremblay, P. E.; Cheng, Sihao; Raddi, Roberto (EDP Sciences, 2021-05-01)
      Article
      Open Access
      White dwarf stars are the most common end point of stellar evolution. The ultramassive white dwarfs are of special interest as they are related to type Ia supernovae explosions, merger events, and fast radio bursts. ...
    • General relativistic pulsations of ultra-massive ZZ Ceti stars 

      Córsico, Alejandro H.; Boston, Reece; Althaus, Leandro G.; Kilic, Mukremin; Kepler, Souza Oliveira; Camisassa, María Eugenia; Torres Gil, Santiago (Oxford University Press, 2023-10-01)
      Article
      Open Access
      Ultra-massive white dwarf stars are currently being discovered at a considerable rate, thanks to surveys such as the Gaia space mission. These dense and compact stellar remnants likely play a major role in Type Ia supernova ...
    • Structure and evolution of ultra-massive white dwarfs in general relativity 

      Althaus, Leandro G.; Camisassa, María Eugenia; Torres Gil, Santiago; Battich, Tiara; Córsico, Alejandro H.; Rebassa Mansergas, Alberto; Raddi, Roberto (EDP Sciences, 2022-12-01)
      Article
      Open Access
      Ultra-massive white dwarfs (M? & 1.05M ) are of utmost importance in view of the role they play in type Ia supernovae explosions, merger events, the existence of high magnetic field white dwarfs, and the physical processes ...
    • The evolution of ultra-massive carbon-oxygen white dwarfs 

      Camisassa, María Eugenia; Althaus, Leandro G.; Koester, Detlev; Torres, Santiago; Gil Pons, Pilar; Córsico, Alejandro H. (Oxford University Press, 2022-04-01)
      Article
      Open Access
      Ultra-massive white dwarfs (MWD¿1.05M¿) are considered powerful tools to study type Ia supernovae explosions, merger events, the occurrence of physical processes in the Super Asymptotic Giant Branch (SAGB) phase, and the ...
    • The evolution of white dwarfs resulting from helium-enhanced, low-metallicity progenitor stars 

      Althaus, Leandro G.; de Geronimo, Francisco; Córsico, Alejandro H.; Torres Gil, Santiago; García-Berro Montilla, Enrique (EDP Sciences, 2017-01-01)
      Article
      Open Access
      Context. Some globular clusters host multiple stellar populations with different chemical abundance patterns. This is particularly true for ¿ Centauri, which shows clear evidence of a helium-enriched subpopulation characterized ...
    • The formation of ultra-massive carbon-oxygen core white dwarfs and their evolutionary and pulsational properties 

      Althaus, Leandro G.; Gil Pons, Pilar; Córsico, Alejandro H.; Camisassa, María Eugenia; Miller Bertolami, Marcelo M; de Geronimo, Francisco; Torres Gil, Santiago; Gutiérrez Cabello, Jordi; Rebassa Mansergas, Alberto (EDP Sciences, 2021-02)
      Article
      Open Access
      The existence of ultra-massive white dwarf stars, MWD & 1.05M , has been reported in several studies. These white dwarfs are relevant for the role they play in type Ia Supernova explosions, the occurrence of physical ...
    • The pulsational properties of ultra-massive DB white dwarfs with carbon-oxygen cores coming from single-star evolution 

      Córsico, Alejandro H.; Gil Pons, Pilar; Torres Gil, Santiago; Althaus, Leandro G. (EDP Sciences, 2021-02)
      Article
      Open Access
      Ultra-massive white dwarfs are relevant for many reasons: their role as type Ia supernova progenitors, the occurrence of physical processes in the asymptotic giant branch phase, the existence of high-field magnetic white ...
    • White dwarf-main-sequence binaries from Gaia EDR3: The unresolved 100 pc volume-limited sample 

      Rebassa Mansergas, Alberto; Solano Márquez, Enrique; Jiménez Esteban, F. M.; Torres Gil, Santiago; Rodrigo Blanco, Carlos; Ferrer i Burjachs, Aina; Calcaferro, Leila M.; Althaus, Leandro G.; Córsico, Alejandro H. (Oxford University Press, 2021-10-01)
      Article
      Open Access
      We use the data provided by the Gaia Early Data Release 3 to search for a highly-complete volume-limited sample of unresolved binaries consisting of a white dwarf and a main sequence companion (i.e. WDMS binaries) within ...