Results 21 to 30 of about 77,093 (285)

Secular Evolution in the Milky Way [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractI will review the secular evolution of the Milky Way disk and bulge with particular attention to the bulge and disk. Evidence for the importance of stellar migration in the Solar neighbourhood will be presented. The upcoming Gaia satellite will lead to a wealth of new data with which to explore these effects.
openaire   +1 more source

Chemodynamical evolution of the Milky Way disk [PDF]

Astronomy & Astrophysics, 2013
In the first paper of this series, we present a new approach for studying the chemo-dynamical evolution in disk galaxies, which consists of fusing disk chemical evolution models with compatible numerical simulations of galactic disks. This method avoids known star formation and chemical enrichment problems encountered in simulations.
Minchev, I., Chiappini, C., Martig, M.
openaire   +3 more sources

The Rapid Onset of Stellar Bars in the Baryon-dominated Centers of Disk Galaxies

The Astrophysical Journal, 2023
Recent observations of high-redshift galactic disks ( z ≈ 1–3) show a strong negative trend in the dark-matter (DM) fraction f _DM with increasing baryon surface density.
Joss Bland-Hawthorn, Thor Tepper-Garcia, Oscar Agertz, Ken Freeman   +3 more
doaj   +1 more source

Chemo-spectrophotometric evolution of spiral galaxies: I. The model and the Milky Way [PDF]

, 1999
The chemical and spectro-photometric evolution of spiral galaxies is investigated with detailed models, making use of up-to-date ingredients (like metallicity dependent stellar properties) and a prescription for the star formation rate (SFR) justified ...
Allard, Allen, Anders, Arimoto, Baraffe, Bazan, Bessell, Bethe, Bethe, Boesgaard, Bohlin, Boissier, Bruzual, Calzetti, Cappellaro, Cardelli, Carigi, Chamcham, Charbonnel, Charbonnel, Chiapini, Clarke, Contardo, Coppi, Corradi, Cunha, Dame, Dopita, Dwek, Edvardsson, Ferrini, Firmani, Fluks, Freudenreich, Gilmore, Gilmore, Gilmore, Gizis, Gould, Grevesse, Guibert, Guiderdoni, Guiderdoni, Gummersbach, Gusten, Han, Haywood, Iben, Israelian, Jimenez, Kennicutt, Kennicutt, Kent, Kroupa, Kroupa, Kuchinski, Kulkarni, Kurucz, Köppen, Lacey, Larson, Lejeune, Lilly, Lyne, Marigo, Massey, Massey, Matteucci, Matteucci,, Mayor, Mera, Molla, N. Prantzos, Natta, Nomoto, Onihishi, Pagel, Prantzos, Prantzos, Prantzos, Prantzos, Prantzos, Prantzos, Prantzos, Rana, Reid, Renzini, Robin, Rocha-Pinto, Rocha-Pinto, Romani, Ruiz-Lapuente, Ruphy, S. Boissier, Sackett, Salpeter, Samland, Scalo, Scalo, Schaller, Shaver, Smart, Steinmetz, Talbot, Tammann, Thielemann, Thielemann, Thomas, Thorsett, Timmes, Tinsley, Tosi, Tosi, Tsujimoto, van der Kruit, Vilchez, Wang, Wang, Wang, Woosley, Wyse, Wyse, Xu   +122 more
core   +4 more sources

Evolution over time of the Milky Way’s disc shape [PDF]

Astronomy & Astrophysics, 2017
Context.Galactic structure studies can be used as a path to constrain the scenario of formation and evolution of our Galaxy. The dependence with the age of stellar population parameters would be linked with the history of star formation and dynamical evolution.Aims.We aim to investigate the structures of the outer Galaxy, such as the scale length, disc
Amôres, E., Robin, A. C., Reylé, C.
openaire   +4 more sources

The Imprint of Clump Formation at High Redshift. II. The Chemistry of the Bulge

The Astrophysical Journal, 2023
In Paper I, we showed that clumps in high-redshift galaxies, having a high star formation rate density (Σ _SFR ), produce disks with two tracks in the [Fe/H]–[ α /Fe] chemical space, similar to that of the Milky Way’s (MW’s) thin+thick disks.
Victor P. Debattista, David J. Liddicott, Oscar A. Gonzalez, Leandro Beraldo e Silva, João A. S. Amarante, Ilin Lazar, Manuela Zoccali, Elena Valenti, Deanne B. Fisher, Tigran Khachaturyants, David L. Nidever, Thomas R. Quinn, Min Du, Susan Kassin   +13 more
doaj   +1 more source

Modelling the chemical evolution of the Milky Way [PDF]

The Astronomy and Astrophysics Review, 2021
AbstractIn this review, I will discuss the comparison between model results and observational data for the Milky Way, the predictive power of such models as well as their limits. Such a comparison, known as Galactic archaeology, allows us to impose constraints on stellar nucleosynthesis and timescales of formation of the various Galactic components ...
openaire   +2 more sources

The R-Process Alliance: Chemodynamically Tagged Groups. II. An Extended Sample of Halo r-process-enhanced Stars

The Astrophysical Journal, 2023
Orbital characteristics based on Gaia Early Data Release 3 astrometric parameters are analyzed for ∼1700 r -process-enhanced (RPE; [Eu/Fe] > +0.3) metal-poor stars ([Fe/H] ≤ −0.8) compiled from the R -Process Alliance, the GALactic Archaeology with ...
Derek Shank, Timothy C. Beers, Vinicius M. Placco, Dmitrii Gudin, Thomas Catapano, Erika M. Holmbeck, Rana Ezzeddine, Ian U. Roederer, Charli M. Sakari, Anna Frebel, Terese T. Hansen   +10 more
doaj   +1 more source

Formation and Evolution of the Milky Way [PDF]

Symposium - International Astronomical Union, 1997
To paint with broad brush strokes, the spectrum of Galactic formation models has as extrema what may be termed the “fast and smooth” and the “slow and lumpy” scenarios. Appropriate or not, to ascribe as champions of these views the works of, respectively, Eggen et al.
openaire   +1 more source

The Galactic Bulge: A Review

, 2007
The Milky Way is the only galaxy for which we can resolve individual stars at all evolutionary phases, from the Galactic center to the outskirt. The last decade, thanks to the advent of near IR detectors and 8 meter class telescopes, has seen a great ...
Alard, Alves-Brito, Barbuy, Barbuy, Barbuy, Bica, Dante Minniti, Dwek, Hamadache, Harding, Immeli, Lecureur, Manuela Zoccali, Zoccali, Zoccali, Zoccali   +15 more
core   +1 more source