Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Calcaferro, Leila M."'
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
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
Autor:
Lopez, Isaac D., Hermes, J. J., Calcaferro, Leila M., Bell, Keaton J., Samuels, Adam, Vanderbosch, Zachary P., Córsico, Alejandro H., Istrate, Alina G.
We report the discovery of pulsations in the extremely low mass (ELM), likely helium-core white dwarf GD 278 via ground- and space-based photometry. GD 278 was observed by the Transiting Exoplanet Survey Satellite (TESS) in Sector 18 at a 2-min caden
Externí odkaz:
http://arxiv.org/abs/2110.02230
Publikováno v:
A&A 647, A140 (2021)
Before reaching their quiescent terminal white-dwarf cooling branch, some low-mass helium-core white dwarf stellar models experience a number of nuclear flashes which greatly reduce their hydrogen envelopes. Just before the occurrence of each flash,
Externí odkaz:
http://arxiv.org/abs/2101.02777
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
Autor:
Bell, Keaton J., Córsico, Alejandro H., Bischoff-Kim, Agnès, Althaus, Leandro G., Bradley, P. A., Calcaferro, Leila M., Montgomery, M. H., Uzundag, Murat, Baran, Andrzej S., Bognár, Zs., Charpinet, S., Ghasemi, H., Hermes, J. J.
Publikováno v:
A&A 632, A42 (2019)
Pulsation frequencies reveal the interior structures of white dwarf stars, shedding light on the properties of these compact objects that represent the final evolutionary stage of most stars. Two-minute cadence photometry from TESS will record pulsat
Externí odkaz:
http://arxiv.org/abs/1910.04180
Autor:
Calcaferro, Leila M., Córsico, Alejandro H., Althaus, Leandro G., Romero, Alejandra D., Kepler, S. O.
Publikováno v:
A&A 620, A196 (2018)
Some low-mass white-dwarf (LMWD) stars with H atmospheres show long-period g-mode pulsations, comprising the class of pulsating WDs called extremely low-mass variable (ELMV) stars. It is generally believed that these stars have thick H envelopes. How
Externí odkaz:
http://arxiv.org/abs/1810.11502
Autor:
Kilic, Mukremin, Hermes, J. J., Corsico, A. H., Kosakowski, Alekzander, Brown, Warren R., Antoniadis, John, Calcaferro, Leila M., Gianninas, A., Althaus, Leandro G., Green, M. J.
We present optical high-speed photometry of three millisecond pulsars with low-mass ($< 0.3 M_{\odot}$) white dwarf companions, bringing the total number of such systems with follow-up time-series photometry to five. We confirm the detection of pulsa
Externí odkaz:
http://arxiv.org/abs/1806.03650
Publikováno v:
A&A 614, A49 (2018)
Extremely low-mass white dwarf (ELM WD; $M_{\star}$ $\lesssim$ $0.18-0.20\ $ $M_{\odot}$) stars are thought to be formed in binary systems via stable or unstable mass transfer. Although stable mass transfer predicts the formation of ELM WDs with thic
Externí odkaz:
http://arxiv.org/abs/1802.06753