Results 131 to 140 of about 3,026,820 (400)

Stellar Evolution and Convection in 3D Hydrodynamic Simulations of a Complete Burning Phase

Galaxies
Our understanding of stellar evolution and nucleosynthesis is limited by the uncertainties coming from the complex multi-dimensional processes in stellar interiors, such as convection and nuclear burning. Three-dimensional stellar models can improve this
Federico Rizzuti, Raphael Hirschi, Vishnu Varma, William David Arnett, Cyril Georgy, Casey Meakin, Miroslav Mocák, Alexander StJ. Murphy, Thomas Rauscher   +8 more
doaj   +1 more source

Asteroseismic Constraints on the Models of Hot B Subdwarfs: Convective Helium-Burning Cores

EPJ Web of Conferences, 2017
Asteroseismology of non-radial pulsations in Hot B Subdwarfs (sdB stars) offers a unique view into the interior of core-helium-burning stars. Ground-based and space-borne high precision light curves allow for the analysis of pressure and gravity mode ...
Schindler Jan-Torge, Green Elizabeth M., Arnett W. David   +2 more
doaj   +1 more source

Constraints on Magnetic Braking from the G8 Dwarf Stars 61 UMa and τ Cet

The Astrophysical Journal Letters, 2023
During the first half of their main-sequence lifetimes, stars rapidly lose angular momentum to their magnetized winds, a process known as magnetic braking.
Travis S. Metcalfe, Klaus G. Strassmeier, Ilya V. Ilyin, Jennifer L. van Saders, Thomas R. Ayres, Adam J. Finley, Oleg Kochukhov, Pascal Petit, Victor See, Keivan G. Stassun, Sandra V. Jeffers, Stephen C. Marsden, Julien Morin, Aline A. Vidotto   +13 more
doaj   +1 more source

Combining Stellar Evolution and Stellar Dynamics [PDF]

Symposium - International Astronomical Union, 1996
There seem to me to be four approaches to the problem of computing the evolution of star clusters. Firstly, one might assume that our knowledge of the evolution of stars can be condensed into a subroutine that can be added to an N-body code. This subroutine would mainly have to give the radius and the time-dependent mass of a star as a function of its ...
openaire   +2 more sources

Current problems in stellar evolution [PDF]

arXiv, 2019
The theory of stellar evolution plays a central role in astrophysics as stellar models are used to infer properties for Galactic and Extragalactic stellar populations as well as exoplanetary systems. However, despite decades of experience, stellar models still face major issues linked to transport processes of chemicals and angular momentum.
arxiv  

Stellar Winds on the Main-Sequence II: the Evolution of Rotation and Winds

, 2015
Aims: We study the evolution of stellar rotation and wind properties for low-mass main-sequence stars. Our aim is to use rotational evolution models to constrain the mass loss rates in stellar winds and to predict how their properties evolve with time on
Brott, I., Güdel, M., Johnstone, C. P., Lüftinger, T.   +3 more
core   +1 more source

Testing stellar evolution models with detached eclipsing binaries

, 2017
Stellar evolution codes, as all other numerical tools, need to be verified. One of the standard stellar objects that allow stringent tests of stellar evolution theory and models, are detached eclipsing binaries.
J. Higl, A. Weiss
semanticscholar   +1 more source

The Gaia-ESO Survey: Sodium and aluminium abundances in giants and dwarfs. Implications for stellar and Galactic chemical evolution [PDF]

, 2016
Context. Stellar evolution models predict that internal mixing should cause some sodium overabundance at the surface of red giants more massive than similar to 1.5-2.0 M-circle dot.
R. Smiljanic, D. Romano, A. Bragaglia, P. Donati, L. Magrini, E. Friel, H. Jacobson, S. Randich, P. Ventura, K. Lind, M. Bergemann, T. Nordlander, T. Morel, E. Pancino, G. Tautvaišienė, V. Adibekyan, M. Tosi, A. Vallenari, G. Gilmore, T. Bensby, P. François, Sergey E. Koposov, A. Lanzafame, A. Recio-Blanco, A. Bayo, G. Carraro, A. Casey, M. Costado, E. Franciosini, U. Heiter, V. Hill, A. Hourihane, P. Jofré, C. Lardo, P. Laverny, J. Lewis, L. Monaco, L. Morbidelli, G. Sacco, L. Sbordone, S. Sousa, C. Worley, S. Zaggia   +42 more
semanticscholar   +1 more source

The solution supramolecular structure of α2 → 8 polysialic acid suggests a structural cause for its low immunogenicity

FEBS Letters, EarlyView.
α2 → 8 polysialic acid elicits poor immunogenicity. Small‐angle scattering shows a supramolecular structure with parallel‐chain binding, although in different forms at μm and mm calcium. The major histocompatibility complex requires molecular weights around 2000 Da to produce antibodies, and 2000 Da polysialic oligomers will bind in these structures ...
Kenneth A. Rubinson
wiley   +1 more source

The Independency of Stellar Mass Loss Rates on stellar X-ray Luminosity and Activity Level based on Solar X-ray flux and Solar Wind Observations [PDF]

, 2011
Stellar mass loss rates are an important input ingredient for stellar evolution models since they determine stellar evolution parameters such as stellar spin-down and increase in stellar luminosity through the lifetime of a star. Due to the lack of direct observations of stellar winds from Sun-like stars stellar X-ray luminosity and stellar level of ...
arxiv   +1 more source