Zobrazeno 21 - 30
of 83
pro vyhledávání: '"Córsico, Alejandro H."'
Autor:
Althaus, Leandro G., Pons, Pilar Gil, Córsico, Alejandro H., Bertolami, Marcelo Miller, De Gerónimo, Francisco, Camisassa, María E., Torres, Santiago, Gutierrez, Jordi, Rebassa-Mansergas, Alberto
Publikováno v:
A&A 646, A30 (2021)
(Abridged abstract) We explore the formation of ultra-massive (M_{\rm WD} \gtrsim 1.05 M_\sun$), carbon-oxygen core white dwarfs resulting from single stellar evolution. We also study their evolutionary and pulsational properties and compare them wit
Externí odkaz:
http://arxiv.org/abs/2011.10439
Autor:
Córsico, Alejandro H., Uzundag, Murat, Kepler, S. O., Althaus, Leandro G., Silvotti, Roberto, Baran, Andrzej S., Vučković, Maja, Werner, Klaus, Bell, Keaton J., Higgins, Michael
Publikováno v:
A&A 645, A117 (2021)
In this paper, we present a detailed asteroseismological analysis of six GW Vir stars including the observations collected by the TESS mission. We processed and analyzed TESS observations of RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371,
Externí odkaz:
http://arxiv.org/abs/2011.03629
Publikováno v:
A&A 644, A55 (2020)
Element diffusion is a key physical process that substantially impacts the superficial abundances, internal structure, pulsation properties, and evolution of white dwarfs. We study the effect of Coulomb separation of ions in the cooling times of evol
Externí odkaz:
http://arxiv.org/abs/2010.11131
Autor:
Camisassa, María E., Althaus, Leandro G., Torres, Santiago, Córsico, Alejandro H., Rebassa-Mansergas, Alberto, Tremblay, Pier-Emmanuel, Cheng, Sihao, Raddi, Roberto
Publikováno v:
A&A 649, L7 (2021)
White dwarf stars are the most common end point of stellar evolution. Of special interest are the ultramassive white dwarfs, as they are related to type Ia Supernovae explosions, merger events, and Fast Radio Bursts. Ultramassive white dwarfs are exp
Externí odkaz:
http://arxiv.org/abs/2008.03028
Autor:
Córsico, Alejandro H.
In the course of their evolution, white-dwarf stars go through at least one phase of variability in which the global pulsations they undergo allow astronomers to peer into their interiors, this way making possible to shed light on their deep inner st
Externí odkaz:
http://arxiv.org/abs/2006.04955
Autor:
Bertolami, Marcelo M. Miller, Battich, Tiara, Corsico, Alejandro H., Christensen-Dalsgaard, Joergen, Althaus, Leandro G.
Publikováno v:
Nat Astron 4, 67-71 (2020)
All evolved stars with masses $M_\star\lesssim 2M_\odot$ undergo a helium(He)-core flash at the end of their first stage as a giant star. Although theoretically predicted more than 50 years ago, this core-flash phase has yet to be observationally pro
Externí odkaz:
http://arxiv.org/abs/2005.02070
Publikováno v:
A&A 638, A30 (2020)
Two of the possibilities for the formation of low-mass ($M_{\star}\lesssim 0.5\,M_{\odot}$) hydrogen-deficient white dwarfs are the occurrence of a very-late thermal pulse after the asymptotic giant-branch phase or a late helium-flash onset in an alm
Externí odkaz:
http://arxiv.org/abs/2003.13602
Autor:
Hollands, Mark A., Tremblay, Pier-Emmanuel, Gänsicke, Boris T., Camisassa, María E., Koester, Detlev, Aungwerojwit, Amornrat, Chote, Paul, Córsico, Alejandro H., Dhillon, Vik S., Gentile-Fusillo, Nicola P., Hoskin, Matthew J., Izquierdo, Paula, Marsh, Tom R., Steeghs, Danny
White dwarfs are dense, cooling stellar embers consisting mostly of carbon and oxygen, or oxygen and neon (with a few percent carbon) at higher initial stellar masses. These stellar cores are enveloped by a shell of helium which in turn is usually su
Externí odkaz:
http://arxiv.org/abs/2003.00028
Autor:
Córsico, Alejandro H.
Publikováno v:
Proc. IAU 15 (2019) 93-106
The vast majority of stars that populate the Universe will end their evolution as white-dwarf stars. Applications of white dwarfs include cosmochronology, evolution of planetary systems, and also as laboratories to study non-standard physics and crys
Externí odkaz:
http://arxiv.org/abs/1912.06738
Autor:
Althaus, Leandro G., Córsico, Alejandro H., Uzundag, Murat, Vučković, Maja, Baran, Andrzej S., Bell, Keaton J., Camisassa, María E., Calcaferro, Leila M., De Gerónimo, Francisco C., Kepler, S. O., Silvotti, Roberto
Publikováno v:
A&A 633, A20 (2020)
The possible existence of warm ($T_{\rm eff}\sim19\,000$ K) pulsating DA white dwarf (WD) stars, hotter than ZZ Ceti stars, was predicted in theoretical studies more than 30 yr ago. However, to date, no pulsating warm DA WD has been discovered. We re
Externí odkaz:
http://arxiv.org/abs/1911.02442