Results 141 to 150 of about 6,468 (258)

Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar Condition

Universe
We model the light HESS J1731-347 compact object (of known stellar mass and radius) within Einstein’s General Relativity, imposing the Karmarkar condition in gravity for anisotropic stars. The three free parameters of the analytic solution are determined
Grigoris Panotopoulos
doaj   +1 more source

Asteroseismology

, 2019
<p><a href="http://cococubed.asu.edu/mesa_market/education.html">MESA Summer School 2012 Labs</a></p ...
Rich Townsend, Rich Townsend (6500435)
core   +1 more source

Radial Oscillations of Dark Matter Stars Admixed with Dark Energy

Universe
We imagine spherically symmetric configurations made of both dark matter and dark energy in the halo of spiral galaxies. Adopting a polytropic equation of state for dark matter and the Extended Chaplygin gas equation of state for dark energy, we model ...
Camila Sepúlveda, Grigoris Panotopoulos
doaj   +1 more source

Photometric Observations of Short Period Variable Stars: EH Librae

Jurnal Fisika Flux
EH Librae [BD-00 2911; αJ2000 = 14h58m55.92s; δJ2000 = -0°56'53.01'] is a pulsating variable δ Scuti stars which is located in the constellation of Libra and has a period of 0.0884129 days.
Sulthan Julieri Djumari, Hakim Luthfi Malasan, Ridlo Wahyudi Wibowo, Alka Budi Wahidin   +3 more
doaj   +1 more source

Local mixing length theory with compositional effects: First application to asymptotic giant branch evolution

Astronomy & Astrophysics
Context. During the evolution of stars on the asymptotic giant branch (AGB), thermal pulses lead to the formation of strongly stratified layers in the outer regions of the CO core, which might lead to inversions in the chemical gradient.
Ocampo M. M., Miller Bertolami M. M., Córsico A. H., Althaus L. G.   +3 more
doaj   +1 more source

Dynamics of Large-Scale Solar Flows. [PDF]

Space Sci Rev, 2023
Hotta H, Bekki Y, Gizon L, Noraz Q, Rast M.   +4 more
europepmc   +1 more source

Twists in the flow: Revisiting convective mixing in rotating stellar models

Astronomy & Astrophysics
Context. Convection and rotation are both key processes in stellar evolution modelling. While standard mixing-length theory (MLT) provides a widely used modelling of convection, it neglects the effects of rotation on convective transport. Aims.
Agrawal Poojan, Dotter Aaron, Aerts Conny, Bessila Leïla, Mathis Stéphane   +4 more
doaj   +1 more source

Measuring stellar differential rotation with asteroseismology

, 2004
The variation of rotation with latitude is poorly known on stars other than the Sun. Several indirect techniques, photometric and spectroscopic, have been used to search for departure from rigid rotation for sufficiently fast rotators.
Gizon, Laurent, Solanki, S. K., Solanki, S., Gizon, L., Solanki, Sami K.   +4 more
core   +1 more source

Ensemble asteroseismology and hierarchical bayesian models: new inferences of astrophysics with oscillating stars [PDF]

, 2020
Asteroseismology – the study of stellar oscillations – is one of the key tools used to study stars in modern astronomy. This thesis focuses on asteroseismology of solar-like oscillators, which exhibit variability driven by the same mechanism as the Sun ...
Hall, Oliver J.
core  

From core to envelope: Revealing the deep dynamics of stars with two convective zones

Astronomy & Astrophysics
On the Hertzsprung-Russell diagram, F-type solar pulsators connect the Sun to intermediate-mass stars located on the instability strip. With respect to lower-mass stars, they are structurally peculiar in the sense that they are constituted of three ...
Breton S. N., Brun A. S., García R. A.
doaj   +1 more source