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Evolutionary synthesis models for star clusters of various metallicities including gaseous emission during the lifetime of the ionising stars are used to model star cluster systems comprising two populations: an old metal-poor globular…

Astrophysics · Physics 2007-05-23 Uta Fritze -- v. Alvensleben , Peter Anders , Richard de Grijs

Whether considering rare astrophysical events on cosmological scales or unresolved stellar populations, accurate models must account for the integrated contribution from the entire history of star formation upon which that population is…

Asymptotic Giant Branch (AGB) stars play a fundamental role in the s-process nucleosynthesis during their thermal pulsing phase. The theoretical predictions obtained by AGB models at different masses, s-process efficiencies, dilution…

Solar and Stellar Astrophysics · Physics 2014-11-20 S. Bisterzo , R. Gallino , O. Straniero , W. Aoki

A series of population models are designed to explore the star formation history of gas-rich, low surface brightness (LSB) galaxies. LSB galaxies are unique in having properties of very blue colors, low H$\alpha$ emission and high gas…

Astrophysics of Galaxies · Physics 2015-06-22 James Schombert , Stacy McGaugh

The stellar population synthesis in unresolved composite objects is a very tricky problem. Indeed, it is a degenerate problem since many parameters affect the observables. The stellar population synthesis issue thus deserves a deep and…

Astrophysics · Physics 2009-11-10 J. Moultaka

We investigate the nature of stellar populations of major galaxy mergers between late-type spirals considerably abundant in interstellar medium by performing numerical simulations designed to solve both the dynamical and chemical evolution…

Astrophysics · Physics 2009-10-30 Kenji Bekki , Yasuhiro Shioya

We follow the chemical evolution of the Galaxy for the s elements using a Galactic chemical evolution (GCE) model, as already discussed by Travaglio et al. (1999, 2001, 2004), with a full updated network and refined asymptotic giant branch…

Solar and Stellar Astrophysics · Physics 2014-11-20 A. Serminato , R. Gallino , C. Travaglio , S. Bisterzo , O. Straniero

The connection between AGB evolution of stellar populations and infrared vs. ultraviolet properties of the parent galaxies is reviewed relying on the updated lookout provided by population-synthesis theory. In particular, planetary-nebula…

Astrophysics · Physics 2007-05-23 Alberto Buzzoni

The stellar population in the Galactic halo is characterised by a large fraction of CEMP stars. Most CEMP stars are enriched in $s$-elements (CEMP-$s$ stars), and some of these are also enriched in $r$-elements (CEMP-$s/r$ stars). One…

Solar and Stellar Astrophysics · Physics 2015-09-02 C. Abate , O. R. Pols , R. J. Stancliffe , R. G. Izzard , A. I. Karakas , T. C. Beers , Y. S. Lee

Integrated light from distant galaxies is often compared to stellar population models via the equivalent widths of spectral features--spectral indices--whose strengths rely on the abundances of one or more elements. Such comparisons hinge…

Astrophysics · Physics 2009-06-23 A. Dotter , B. Chaboyer , J. W. Ferguson , H. -c. Lee , G. Worthey , E. Baron , D. Jevremovic

Optimised population synthesis provides an empirical method to extract the relative mix of stellar evolutionary stages and the distribution of atmospheric parameters within unresolved stellar systems, yet a robust validation of this method…

Astrophysics of Galaxies · Physics 2015-06-19 Christopher Barber , Stephane Courteau , Joel Roediger , Ricardo Schiavon

Galaxy formation and evolution involves a variety of effectively stochastic processes that operate over different timescales. The Extended Regulator model provides an analytic framework for the resulting variability (or `burstiness') in…

Astrophysics of Galaxies · Physics 2024-02-14 Kartheik G. Iyer , Joshua S. Speagle , Neven Caplar , John C. Forbes , Eric Gawiser , Joel Leja , Sandro Tacchella

Buzzoni's (1989) grid of synthetic spectral energy distributions, representative of old stellar populations, was used to derive colours in different photometric systems, and to compare the theoretical predictions with the observational data…

Astrophysics · Physics 2007-05-23 S. Covino , L. E. Pasinetti Fracassini , M. L. Malagnini , A. Buzzoni

The physical properties of galaxies are encoded within their spectral energy distribution and require comparison with models to be extracted. These models must contain a synthetic stellar population and, where infrared data is to be used,…

Astrophysics of Galaxies · Physics 2022-06-22 G. T. Jones , E. R. Stanway , A. C. Carnall

The stellar yields for galactic modeling applications (SYGMA) code is an open-source module that models the chemical ejecta and feedback of simple stellar populations (SSPs). It is intended for use in hydrodynamical simulations and…

Astrophysics of Galaxies · Physics 2018-09-18 Christian Ritter , Benoit Côté , Falk Herwig , Julio F. Navarro , Chris L. Fryer

We investigate the evolution of galaxy masses and star formation rates in the Evolution and Assembly of Galaxies and their Environment (EAGLE) simulations. These comprise a suite of hydrodynamical simulations in a $\Lambda$CDM cosmogony…

Evolutionary models form a vital part of stellar population research to understand their evolution, but despite their long history of development, they often misrepresent and misinterpret the properties of stellar population observed…

Astrophysics of Galaxies · Physics 2018-06-27 Yuvraj Harsha Sreedhar , Karl Rakos , Gerhard Hensler

The first paper in this series explored the effects of altering the chemical mixture of the stellar population on an element by element basis on stellar evolutionary tracks and isochrones to the end of the red giant branch. This paper…

Grids of stellar evolution are required in many fields of astronomy/astrophysics, such as planet hosting stars, binaries, clusters, chemically peculiar stars, etc. In this study, a grid of stellar evolution models with updated ingredients…

Solar and Stellar Astrophysics · Physics 2015-12-16 Mutlu Yildiz

Stellar population studies of early-type galaxies (ETGs) based on their optical stellar continuum suggest that these are quiescent systems. However, emission lines and ultraviolet photometry reveal a diverse population. We use a new version…