Results 31 to 40 of about 75,563 (322)

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

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

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

The AMBRE Project: Origin and evolution of sulfur in the Milky Way [PDF]

Astronomy & Astrophysics, 2021
Context. Sulfur is a volatile chemical element that plays an important role in tracing the chemical evolution of the Milky Way and external galaxies. However, its nucleosynthesis origin and abundance variations in the Galaxy are still unclear because the number of available stellar sulfur abundance measurements is currently rather small. Aims. The goal
Perdigon, J., de Laverny, P., Recio-Blanco, A., Fernandez-Alvar, E., Santos-Peral, P., Kordopatis, G., Álvarez, M. A.   +6 more
openaire   +5 more sources

Structure and Evolution of the Milky Way [PDF]

, 2011
Proc. of the workshop "Red Giants as Probes of the Structure and Evolution of the Milky Way" (Roma, 15-17 Nov 2010), Astrophysics and Space Science Proceedings, ISBN 978-3-642-18417-8 (eds. A. Miglio, J. Montalban, A. Noels).
openaire   +3 more sources

Stellar Bars in Isolated Gas-rich Spiral Galaxies Do Not Slow Down

The Astrophysical Journal, 2023
Elongated bar-like features are ubiquitous in galaxies, occurring at the centers of approximately two-thirds of spiral disks in the nearby Universe. Due to gravitational interactions between the bar and the other components of galaxies, it is expected ...
Angus Beane, Lars Hernquist, Elena D’Onghia, Federico Marinacci, Charlie Conroy, Jia Qi, Laura V. Sales, Paul Torrey, Mark Vogelsberger   +8 more
doaj   +1 more source

Disentangling Stellar Age Estimates from Galactic Chemodynamical Evolution

The Astrophysical Journal, 2023
Stellar ages are key for determining the formation history of the Milky Way, but are difficult to measure precisely. Furthermore, methods that use chemical abundances to infer ages may entangle the intrinsic evolution of stars with the chemodynamical ...
Jeff Shen, Joshua S. Speagle, J. Ted Mackereth, Yuan-Sen Ting, Jo Bovy   +4 more
doaj   +1 more source

The Formalism of Milky-Way Antimatter-Domains Evolution

Galaxies, 2023
If baryosynthesis is strongly nonhomogeneous, macroscopic regions with antibaryon excess can be created in the same process from which the baryonic matter is originated. This exotic possibility can become real, if the hints to the existence of antihelium
Maxim Yu. Khlopov, Orchidea Maria Lecian
doaj   +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

Evolution of lithium in the Milky Way halo, discs, and bulge [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
Abstract In this work, we study the Galactic evolution of lithium by means of chemical evolution models in the light of the most recent spectroscopic data from Galactic stellar surveys. We consider detailed chemical evolution models for the Milky Way halo, discs, and bulge, and we compare our model predictions with the most recent ...
V. Grisoni, V. Grisoni, Francesca Matteucci, Francesca Matteucci, Donatella Romano, X. Fu   +5 more
openaire   +5 more sources