Back to Search
Start Over
The effect of 22Ne diffusion in the evolution and pulsational properties of white dwarfs with solar metallicity progenitors
- Source :
- CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), SEDICI (UNLP), Universidad Nacional de La Plata, instacron:UNLP, Recercat. Dipósit de la Recerca de Catalunya, instname
- Publication Year :
- 2016
-
Abstract
- Because of the large neutron excess of 22Ne, sedimentation of this isotope occurs rapidly in the interior of white dwarfs. This process releases an additional amount of energy, thus delaying the cooling times of the white dwarf. This influences the ages of different stellar populations derived using white dwarf cosmochronology. Furthermore, the overabundance of 22Ne in the inner regions of the star modifies the Brunt-Väisälä frequency, thus altering the pulsational properties of these stars. In this work we discuss the impact of 22Ne sedimentation in white dwarfs resulting from solar metallicity progenitors (Z = 0.02). We performed evolutionary calculations of white dwarfs with masses of 0.528, 0.576, 0.657, and 0.833 derived from full evolutionary computations of their progenitor stars, starting at the zero-Age main sequence all the way through the central hydrogen and helium burning, the thermally pulsing asymptotic giant branch (AGB), and post-AGB phases. Our computations show that at low luminosities (), 22Ne sedimentation delays the cooling of white dwarfs with solar metallicity progenitors by about 1 Gyr. Additionally, we studied the consequences of 22Ne sedimentation on the pulsational properties of ZZ Ceti white dwarfs. We find that 22Ne sedimentation induces differences in the periods of these stars larger than the present observational uncertainties, particularly in more massive white dwarfs.<br />Facultad de Ciencias Astronómicas y Geofísicas<br />Instituto de Astrofísica de La Plata
- Subjects :
- Ciencias Astronómicas
Nuclear Theory
Ciencias Físicas
Astrophysics
stars: interiors
Evolution of stars
01 natural sciences
Diffusion
purl.org/becyt/ford/1 [https]
Asymptotic giant branch
Astrophysics::Solar and Stellar Astrophysics
stars: evolution
Diffusion (business)
010303 astronomy & astrophysics
white dwarfs
Physics
diffusion
Asteroseismology
Estels nans
Astrophysics - Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
White dwarf stars
Dense matter
CIENCIAS NATURALES Y EXACTAS
dense matter
Metallicity
FOS: Physical sciences
chemistry.chemical_element
Astrophysics::Cosmology and Extragalactic Astrophysics
asteroseismology
Nuclear Theory (nucl-th)
0103 physical sciences
010306 general physics
Condensed Matter - Statistical Mechanics
Solar and Stellar Astrophysics (astro-ph.SR)
Helium
Astrophysics::Galaxy Astrophysics
interiors [stars]
Statistical Mechanics (cond-mat.stat-mech)
White dwarfs
White dwarf
Astronomy and Astrophysics
purl.org/becyt/ford/1.3 [https]
Astrophysics - Astrophysics of Galaxies
Astronomía
Interior stars
Stars
chemistry
Space and Planetary Science
evolution [stars]
Física::Astronomia i astrofísica [Àrees temàtiques de la UPC]
Astrophysics of Galaxies (astro-ph.GA)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), SEDICI (UNLP), Universidad Nacional de La Plata, instacron:UNLP, Recercat. Dipósit de la Recerca de Catalunya, instname
- Accession number :
- edsair.doi.dedup.....8ffb31919bd1ac09327250b0fdf4c351