Results 11 to 20 of about 29,106 (245)
Rotation and Evolution of Be Stars [PDF]
International Astronomical Union Colloquium, 1970 AbstractThe evidence in favor of the hypothesis that Be stars owe their emission properties to material rotationally ejected from the equator is reviewed. The evolutionary state of Be Stars is then discussed with reference to evolutionary sequences of stellar models.
J. Hardorp, P. A. Strittmatter
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Evolution of Proto–Neutron Stars [PDF]
The Astrophysical Journal, 1999 We study the thermal and chemical evolution during the Kelvin-Helmholtz phase of the birth of a neutron star, employing neutrino opacities that are consistently calculated with the underlying equation of state (EOS). Expressions for the diffusion coefficients appropriate for general relativistic neutrino transport in the equilibrium diffusion ...
J. A. Pons +4 more
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The Evolution of Rotating Stars [PDF]
Annual Review of Astronomy and Astrophysics, 2000 ▪ Abstract In this article we first review the main physical effects to be considered in the building of evolutionary models of rotating stars on the Upper Main-Sequence (MS). The internal rotation law evolves as a result of contraction and expansion, meridional circulation, diffusion processes, and mass loss. In turn, differential rotation and mixing
André Maeder and, Georges Meynet
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THE SOLITON STARS EVOLUTION [PDF]
International Journal of Modern Physics D, 1998 The evolution of a soliton star filled with fermions is studied in the framework of general relativity. Such a system could be described by the surface tension σ0, the bag constant B, and the fermion number density ρ. One of the parameters mentioned above could prevail in the system and thus affect the spacetime inside the bubble.
Ryszard Mańka, Ilona Bednarek
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Symposium - International Astronomical Union, 1999 The evolution of massive stars is far from being fully understood, as we outline by pointing to a number of open problems related to massive stars in the Magellanic Clouds. We argue that rotation may be a key ingredient in the physics of massive stars.
Langer, Norbert, Heger, Alexander
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A Path to the Stars: The Evolution of the Species [PDF]
Advances in Astronomy, 2010 During the last years, a number of telescopes have been dedicated to the followup of the GRBs. But after the Swift launch, the average observed intensity of the GRBs showed to be lower than thought before. Our experience with the robotic 60 cm REM telescope confirmed this evidence, with a large number of lost GRBs.
F. Vitali +30 more
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The stratified evolution of a cool star [PDF]
Astronomische Nachrichten, 2013 AbstractA low mass star usually experiences stratification and abundance anomalies during its evolution. A 0.95 M⊙ star with a metallicity Z = 0.004 is followed from the main–sequence to the horizontal branch (HB). On the main sequence the larger effects of stratification may come from accretion as was suggested in relation to metallicity and planet ...
Michaud, G., Richer, J., Richard, O.
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The evolution of star clusters: the resolved-star approach [PDF]
Astrophysics and Space Science, 2009 We present the first results of a new technique to detect, locate, and characterize young dissolving star clusters. Using HST/ACS archival images of the nearby galaxy IC2574, we performed stellar PSF photometry and selected the most massive stars as our first test sample.
Daniela Calzetti +4 more
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Chemical evolution of star clusters [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2010 I discuss the chemical evolution of star clusters, with emphasis on old Galactic globular clusters (GCs), in relation to their formation histories. GCs are clearly formed in a complex fashion, under markedly different conditions from any younger clusters presently known. Those special conditions must be linked to the early formation epoch of the Galaxy
van Loon, Jacco Th.
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Evolution of exoplanets and their parent stars [PDF]
EAS Publications Series, 2014 Studying exoplanets with their parent stars is crucial to understand their population, formation and history. We review some of the key questions regarding their evolution with particular emphasis on giant gaseous exoplanets orbiting close to solar-type stars.
Guillot, Tristan +4 more
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