The Impact of Breathing Pulses during Core Helium Burning on the Core Chemical Structure and Pulsations of Hydrogen-rich Atmosphere White Dwarfs

Autor: Alejandro H. Córsico, Leandro G. Althaus

Publikováno v: The Astrophysical Journal, Vol 964, Iss 1, p 30 (2024)

Breathing pulses are mixing episodes that could develop during the core helium-burning phase of low- and intermediate-mass stars. The occurrence of breathing pulses is expected to bear consequences on the formation and evolution of white dwarfs, part

Externí odkaz: https://doaj.org/article/1ed884d885cf420db94a127c192e5b8a

WD J004917.14$-$252556.81, the Most Massive Pulsating White Dwarf

Autor: Mukremin Kilic, Alejandro H Córsico, Adam G Moss, Gracyn Jewett, Francisco C De Gerónimo, Leandro G Althaus

We present APO and Gemini time-series photometry of WD J004917.14$-$252556.81, an ultramassive DA white dwarf with $T_{\rm eff} = 13020$ K and $\log{g} = 9.34$. We detect variability at two significant frequencies, making J0049$-$2525 the most massiv

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99599363fa32d0cd3177da4f142e0d44

Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS -- IV. Discovery of two new GW Vir stars: TIC0403800675 and TIC1989122424

Autor: Murat Uzundag, Alejandro H Córsico, S O Kepler, Leandro G Althaus, Klaus Werner, Nicole Reindl, Maja Vučković

We present two new GW Vir-type pulsating white dwarf stars, TIC\,0403800675 (WD\,J115727.68-280349.64) and TIC\,1989122424 (WD J211738.38-552801.18) discovered in the Transiting Exoplanet Survey Satellite (TESS) photometric data. For both stars, the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::940638d0cf291c1843bfc09666312857
http://arxiv.org/abs/2204.02501

Structure and evolution of ultra-massive white dwarfs in general relativity

Autor: Leandro G. Althaus, María E. Camisassa, Santiago Torres, Tiara Battich, Alejandro H. Córsico, Alberto Rebassa-Mansergas, Roberto Raddi

[Context] Ultra-massive white dwarfs (M ABSTRACT 1.05 M) 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 in the supe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c6c79afa8bce59345551671e6185991c
http://hdl.handle.net/10261/295859

White dwarf-main sequence binaries from Gaia EDR3 : the unresolved 100 pc volume-limited sample

Autor: Enrique Solano, Leandro Gabriel Althaus, F. M. Jiménez-Esteban, A Ferrer-Burjachs, Santiago Torres, Alberto Rebassa-Mansergas, Alejandro H. Córsico, Leila M. Calcaferro, Carlos Rodrigo

Publikováno v: CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Monthly Notices of the Royal Astronomical Society
Digital.CSIC. Repositorio Institucional del CSIC
instname
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)

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 100 pc. We select 112 objects

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ffb72236ca4c33b86acd0094d51f5d6f
https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stab2039/6322850