Results 311 to 320 of about 155,710 (341)
The chemical evolution of the Milky Way disk [PDF]
Nuclear Physics A, 1997 Abstract The chemical evolution of the disk of our Galaxy is studied with numerical models assuming infall and a radially varying star formation rate (SFR). We propose a model with a minimal set of physically plausible assumptions which satisfies the main observational constraints of the disk, including those of the solar neighborhood.
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ACM SIGGRAPH 2024 Electronic Theater
The visualization-based Spark: The Universe in Us planetarium show includes an immersive journey through a threedimensional model of the Milky Way, merging observed and computational data.
Ryan Wyatt, Mike Schmitt
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The visualization-based Spark: The Universe in Us planetarium show includes an immersive journey through a threedimensional model of the Milky Way, merging observed and computational data.
Ryan Wyatt, Mike Schmitt
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The Evolution of the Milky way
Astrophysics and Space Science, 1999A two-dimensional chemodynamical model of the Milky Way Galaxy is presented that can account for the structural, kinematical, and chemical pecularities of the galactic components in a self-consistent way. The dynamics of three stellar components and the multi-phase interstellar medium consisting of clouds and intercloud gas are followed in detail. Mass
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EVOLUTION OF THE MILKY WAY DISK
2006The Solar neighbourhood is where the physical basis for models of the evolu- tion of spiral galaxy disks can be tested most stringently. A new survey has provided full space motions, metallicities, ages, and duplicity information for over 14,000 nearby F and G dwarfs.
Nordström, Birgitta, Andersen, Johannes
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The Evolution of the Milky Way Disk
2000The Milky Way is a heterogeneous system, with at least three components (halo, bulge, disk) having very different chemical, photometric and kinematical properties. A reliable model for the evolution of the Milky Way accounting for those properties does not exist at present.
S. Boissier, N. Prantzos
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Radial migration and chemical evolution in the Milky Way
Astronomische Nachrichten, 2016AbstractThe role of radial migration on the chemical evolution of the Milky Way is studied with semi‐analytical models of disk evolution, using several new/updated ingredients and parametrized prescriptions for blurring and churning. It is found that radial migration impacts on several properties of the local disk (shape and dispersion of the age ...
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2020
Our knowledge of the Milky Way has been deeply renewed since a dozen years, following the results of the astrometric satellite HIPPARCOS, and those of large stellar surveys. Many concepts thought to be well established disappeared, to be replaced by others going towards a larger complexity: in particular, the discovery of radial migrations of stars has
Francoise Combes +2 more
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Our knowledge of the Milky Way has been deeply renewed since a dozen years, following the results of the astrometric satellite HIPPARCOS, and those of large stellar surveys. Many concepts thought to be well established disappeared, to be replaced by others going towards a larger complexity: in particular, the discovery of radial migrations of stars has
Francoise Combes +2 more
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Formation and Evolution of the Milky Way
2003The problem of understanding the formation of the Galaxy is part of the problem of explaining galaxy formation in general. In particular, we should try to understand the relative importance of mergers and dissipative collapse in the formation of all galaxies, and whether the observational information about our Galaxy is enough to explain the timescales
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Chemical evolution in the Milky Way Disk
AIP Conference Proceedings, 2006Classical models of galactic evolution predict a smooth rise in heavy‐element abundance (metallicity) with time. We test this prediction with a new, large and unbiased sample of long‐lived stars in the solar neighbourhood and find that several of the key tests fail to support the classical predictions.
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The Formation and Early Evolution of the Milky Way Galaxy
Science, 2000Recent observations indicate that the Milky Way may have formed by aggregation of gas and stars from a reservoir of preexisting small galaxies in the local universe. The process probably began more than 12 billion years ago with material of different original angular momentum following two separate evolutionary lines, one into the slowly rotating halo ...
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