Results 21 to 30 of about 461 (261)
Pulsational instabilities in hot pre-horizontal branch stars
EPJ Web of Conferences, 2017 The ϵ mechanism is a self-excitation mechanism of pulsations which acts on the regions where nuclear burning takes place. It has been shown that the ϵ mechanism can excite pulsations in models of hot helium-core flash, and that the pulsations of LS IV-14·
Battich Tiara +3 more
doaj +1 more source
The Astrophysical Journal, 1990 Near-discontinuities in the density of a star, such as that encountered in the transition between a chromosphere and a corona, reflect acoustic waves and thereby partially contain them within the star. These reflections help to establish a resonant acoustic cavity with discrete characteristic frequencies, even for modes with frequencies above the ...
N. J. Balmforth, D. O. Gough
openaire +1 more source
The Power of Asteroseismology for Early Stellar Evolution
Frontiers in Astronomy and Space Sciences, 2019 Stars are the building blocks of planetary systems, clusters, associations, and galaxies. The evolution of stars is driven by physical processes in their interiors making theory of stellar interior structure and evolution an important ingredient of ...
Konstanze Zwintz
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Opacity Effects on Pulsations of Main-Sequence A-Type Stars
Atoms, 2018 Opacity enhancements for stellar interior conditions have been explored to explain observed pulsation frequencies and to extend the pulsation instability region for B-type main-sequence variable stars.
Joyce A. Guzik +2 more
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The Astrophysical Journal Supplement Series, 2023 We present the results of new time-series photometric observations of 29 pre–white dwarf stars of PG 1159 spectral type, carried out in the years 2014–2022.
Paulina Sowicka +11 more
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Secretory phospholipase A2 (sPLA2) is an inflammatory mediator linked to acute chest syndrome (ACS) in sickle cell disease (SCD), a serious complication that can develop during an acute vaso‐occlusive pain episode (VOE). Plasma sPLA2 levels have been proposed as a potential biomarker for predicting ACS onset.
Rawan Korman +10 more
wiley +1 more source
FEBS Letters, EarlyView.Embryo‐like structures (stembryos) are an innovative tool, but they are hindered by experimental variability and limited developmental potential. DNA methylation is crucial for mammalian development, but its status in stembryo models is poorly characterized.
Sara Canil +4 more
wiley +1 more source
From mice to humans—divergent strategies for intestinal homeostasis and regeneration
FEBS Letters, EarlyView.Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa +2 more
wiley +1 more source
Self-consistent Nonlinear Classical Cepheid Pulsations during Stellar Evolution with MESA
The Astrophysical JournalWe extend the time-dependent convection (TDC) treatment in MESA by introducing eddy-viscous dissipation. This software change brings MESA-TDC into closer alignment with the radial stellar pulsation (RSP) framework of the MESA-RSP module.
Ebraheem Farag +7 more
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Scaling Relations for Solar-Like Oscillations: A Review
Frontiers in Astronomy and Space Sciences, 2020 The scaling relations for solar-like oscillations provide a translation of the features of the stochastic low-degree modes of oscillation in the Sun to predict the features of solar-like oscillations in other stars with convective outer layers.
Saskia Hekker, Saskia Hekker
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