Zobrazeno 1 - 10
of 23
pro vyhledávání: '"F. C. Wachlin"'
Recently a new class of hot subluminous stars strongly enriched in C and O have been discovered (CO-sdOs). These stars show abundances very similar to those observed in PG1159 stars but at lower temperatures. Moreover, it has been recently suggested
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cbb69a314b95820e754168138c3cb152
http://arxiv.org/abs/2202.05635
http://arxiv.org/abs/2202.05635
Publikováno v:
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
Universidad Nacional de La Plata
instacron:UNLP
The accretion of heavy material from debris disk on the surface of hydrogen-rich white dwarfs induces a double diffusivity instability known as the fingering convection. It leads to an efficient extra mixing which brings the accreted material deeper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::90745f05058797274ed01fb218297b16
http://sedici.unlp.edu.ar/handle/10915/123832
http://sedici.unlp.edu.ar/handle/10915/123832
Autor:
María E. Camisassa, M. L. Novarino, Leandro Gabriel Althaus, Francisco C. De Gerónimo, Alejandro H. Córsico, René D. Rohrmann, Enrique García-Berro, F. C. Wachlin, M. M. Miller Bertolami
Publikováno v:
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Ultra-massive white dwarfs are powerful tools to study various physical processes in the Asymptotic Giant Branch (AGB), type Ia supernova explosions and the theory of crystallization through white dwarf asteroseismology. Despite the interest in these
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3f04386ba92d03b8c338923d017e7b4c
https://www.aanda.org/10.1051/0004-6361/201833822
https://www.aanda.org/10.1051/0004-6361/201833822
Autor:
María E. Camisassa, Alejandro H. Córsico, Leandro Gabriel Althaus, F. C. Wachlin, Francisco C. De Gerónimo
Publikováno v:
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Ultra-massive DA WD stars are expected to harbor ONe cores resulting from the progenitor evolution through the Super-AGB phase. As evolution proceeds during the WD cooling phase, a crystallization process resulting from Coulomb interactions in very d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10a68d7eade1d0e9644e849eebaee56d
https://www.aanda.org/10.1051/0004-6361/201833789
https://www.aanda.org/10.1051/0004-6361/201833789
Publikováno v:
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2017, 601, ⟨10.1051/0004-6361/201630094⟩
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2017, 601, ⟨10.1051/0004-6361/201630094⟩
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
Context. A large fraction of white dwarfs show photospheric chemical composition that is polluted by heavy elements accreted from a debris disk. Such debris disks result from the tidal disruption of rocky planetesimals that have survived to whole ste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::78df0d40c6444eefc780e416cf03806e
https://www.aanda.org/articles/aa/abs/2017/05/aa30094-16/aa30094-16.html
https://www.aanda.org/articles/aa/abs/2017/05/aa30094-16/aa30094-16.html
Publikováno v:
EAS Publications Series. 63:297-302
Heavy elements are observed in the atmospheres of many DA and DB white dwarfs, and their presence is attributed to the accretion of matter coming from debris disks. Several authors have deduced accretion rates from the observed abundances, taking int
Publikováno v:
Celestial Mechanics and Dynamical Astronomy. 91:173-190
We created a triaxial stellar system through the cold dissipationless collapse of 100,000 particles whose evolution was followed with a multipolar code. Once an equilibrium system had been obtained, the multipolar expansion was freezed and smoothed i
Publikováno v:
Celestial Mechanics and Dynamical Astronomy. 85:247-267
In several previous papers we had investigated the orbits of the stars that make up galactic satellites and found that many of those orbits were chaotic. In those investigations we made extensive use of the frequency analysis method of Carpintero and
Publikováno v:
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Universidad Nacional de La Plata
instacron:UNLP
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Context. Fingering (thermohaline) convection has been invoked for several years as a possible extra-mixing which could occur in red giant stars; it is due to the modification of the chemical composition induced by nuclear reactions in the hydrogen bu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0892c65b7f901b1ae303d86e8f7f5489
http://arxiv.org/abs/1409.4216
http://arxiv.org/abs/1409.4216
Publikováno v:
International Astronomical Union Colloquium. 174:281-285
We have studied the motion of massless particles (stars) bound to a stellar system (a galactic satellite) that moves on a circular orbit in an external field (a galaxy). A large percentage of the stellar orbits turned out to be chaotic, contrary to w