Zobrazeno 1 - 10
of 197
pro vyhledávání: '"Córsico, Alejandro H"'
Autor:
De Gerónimo, Francisco C., Bertolami, Marcelo M. Miller, Battich, Tiara, Tang, Xiaodong, Catelan, Márcio, Córsico, Alejandro H., Li, Yunjun, Fang, Xiao, Althaus, Leandro G.
Recent determinations of the total rate of the 12C+12C nuclear reaction show non-negligible differences with the reference reaction rate commonly used in previous stellar simulations. In addition, the current uncertainties in determining each exit ch
Externí odkaz:
http://arxiv.org/abs/2409.10793
Autor:
Calcaferro, Leila M., Córsico, Alejandro H., Uzundag, Murat, Althaus, Leandro G., Kepler, S. O., Werner, Klaus
A central challenge in the field of stellar astrophysics lies in accurately determining the mass of isolated stars. However, for pulsating white dwarf (WD) stars, the task becomes more tractable due to the availability of multiple approaches such as
Externí odkaz:
http://arxiv.org/abs/2409.03896
Autor:
Calcaferro, Leila M., Sowicka, Paulina, Uzundag, Murat, Córsico, Alejandro H., Kepler, S. O., Bell, Keaton J., Althaus, Leandro G., Handler, Gerald, Kawaler, Steven D., Werner, Klaus
Publikováno v:
A&A 686, A140 (2024)
Significant advances have been achieved through the latest improvements in the photometric observations accomplished by the recent space missions, substantially boosting the study of pulsating stars via asteroseismology. The TESS mission has already
Externí odkaz:
http://arxiv.org/abs/2402.16642
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:
http://arxiv.org/abs/2402.03490
Autor:
Uzundag, Murat, De Gerónimo, Francisco C., Córsico, Alejandro H., Silvotti, Roberto, Bradley, Paul A., Montgomery, Michael H., Catelan, Márcio, Toloza, Odette, Bell, Keaton J., Kepler, S. O., Althaus, Leandro G., Kleinman, Scot J., Kilic, Mukremin, Mullally, Susan E., Gänsicke, Boris T., Bąkowska, Karolina, Barber, Sam, Nitta, Atsuko
G\,29$-$38 (TIC~422526868) is one of the brightest ($V=13.1$) and closest ($d = 17.51$\,pc) pulsating white dwarfs with a hydrogen-rich atmosphere (DAV/ZZ Ceti class). It was observed by the {\sl TESS} spacecraft in sectors 42 and 56. The atmosphere
Externí odkaz:
http://arxiv.org/abs/2309.04809
Autor:
Córsico, Alejandro H., Boston, S. Reece, Althaus, Leandro G., Kilic, Mukremin, Kepler, S. O., Camisassa, María E., Torres, Santiago
Ultra-massive white dwarf stars are currently being discovered at a considerable rate, thanks to surveys such as the {\it Gaia} space mission. These dense and compact stellar remnants likely play a major role in type Ia supernova explosions. It is po
Externí odkaz:
http://arxiv.org/abs/2307.11834
Autor:
Althaus, Leandro G., Córsico, Alejandro H., Camisassa, María E., Torres, Santiago, Gil-Pons, Pilar, Rebassa-Mansergas, Alberto, Raddi, Roberto
We employ the La Plata stellar evolution code, LPCODE, to compute the first set of constant rest-mass carbon-oxygen ultra-massive white dwarf evolutionary sequences for masses higher than 1.29 Msun that fully take into account the effects of general
Externí odkaz:
http://arxiv.org/abs/2306.05251
Autor:
Kilic, Mukremin, Córsico, Alejandro H., Moss, Adam G., Jewett, Gracyn, De Gerónimo, Francisco C., Althaus, Leandro G.
We present APO and Gemini time-series photometry of WD J004917.14$-$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$-$2525 the most massiv
Externí odkaz:
http://arxiv.org/abs/2304.10330
Autor:
Calcaferro, Leila M., Córsico, Alejandro H., Althaus, Leandro G., Lopez, Isaac D., Hermes, J. J.
(Abridged) We present an exploration of the internal rotation of GD 278, the first pulsating extremely low-mass white dwarf that shows rotational splittings within its periodogram. We assess the theoretical frequency splittings expected for different
Externí odkaz:
http://arxiv.org/abs/2303.15962
Ultra-massive H-rich (DA spectral type) white dwarf stars ($M_{\star} > 1.05 M_{\odot}$) are expected to be substantially crystallized by the time they reach the ZZ Ceti instability strip ($T_{\rm eff} \sim 12\,000$ K). Crystallization leads to a sep
Externí odkaz:
http://arxiv.org/abs/2302.04100