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Evolutionary synthesis models are the prime method to construct models of stellar populations, and to derive physical parameters from observations. One of the assumptions for such models so far has been the time-independence of the stellar…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 P. Anders , H. J. G. L. M Lamers , H. Baumgardt

We use our unified chemical and spectrophotometric evolutionary synthesis code to describe galaxies of various Hubble types. With stellar evolutionary tracks and element yields for 5 different metallicities we follow the spectrophotometric…

Astrophysics · Physics 2007-05-23 U. Fritze - v. Alvensleben , U. Lindner , K. J. Fricke

We use N-body simulations to study the dynamical evolution of Population III (Pop III) stellar systems and the resulting binary statistics. We design a physically-motivated framework for the initial conditions of Pop III star clusters,…

Astrophysics of Galaxies · Physics 2020-12-02 Boyuan Liu , Georges Meynet , Volker Bromm

We present a new set of nonlinear, convective radial pulsation models for main sequence stars computed assuming three metallicities: Z=0.0001, 0.001 and 0.008. These chemical compositions bracket the metallicity of stellar systems hosting…

Solar and Stellar Astrophysics · Physics 2015-09-16 G. Fiorentino , M. Marconi , G. Bono , E. Dalessandro , F. R. Ferraro , B. Lanzoni , L. Lovisi , A. Mucciarelli

Recently, measurements of abundances in extremely metal poor (EMP) stars have brought new constraints on stellar evolution models. In an attempt to explain the origin of the abundances observed, we computed pre--supernova evolution models,…

Astrophysics · Physics 2015-06-03 R. Hirschi , C. Fröhlich , M. Liebendörfer , F. -K. Thielemann

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

Space densities and birthrates of Planetary Nebulae (PNe) are highly uncertain. A large range of formation rates has been derived by different studies, which has led to contradicting ideas for the final evolutionary phases of low and…

Solar and Stellar Astrophysics · Physics 2009-07-22 S. Weston , R. Napiwotzki , S. Sale

The cornerstone mission Gaia, together with complementary surveys, will revolutionize our understanding of the formation and history of our Galaxy, providing accurate stellar masses, radii, ages, distances, as well as chemical properties…

Solar and Stellar Astrophysics · Physics 2017-04-26 N. Lagarde , A. C. Robin , C. Reylé , G. Nasello

Galactic binary neutron stars (BNSs) are a unique laboratory to probe the evolution of BNSs and their progenitors. Here, we use a new version of the population synthesis code SEVN to evolve the population of Galactic BNSs, by modeling the…

We include gaseous continuum and line emission into our GALEV models for the spectral and photometric evolution of Simple Stellar Populations (SSPs) for various metallicities in the range 0.02 <= Z/Zsun <= 2.5. This allows to extend them to…

Astrophysics · Physics 2010-04-06 Peter Anders , Uta Fritze -- v. Alvensleben

Uncertainties in stellar population models, both in terms of stellar evolution and stellar spectra, translate into uncertainties in our interpretation of stellar populations in galaxies, since stars are the source of most of the light we…

Astrophysics of Galaxies · Physics 2023-03-31 C. M. Byrne , E. R. Stanway

We present the integrated J, H, K, L, M and N magnitudes and the colours involving infrared bands, for an extensive set of instantaneous-burst binary stellar populations (BSPs) by using evolutionary population synthesis (EPS). By comparing…

Solar and Stellar Astrophysics · Physics 2010-06-24 F. Zhang , L. Li , Z. Han

Binary stars are common and it is necessary to model stellar populations using binary stars. We introduce a method to model binary-star stellar populations quickly. The method can also be used to model single-star stellar populations. The…

Solar and Stellar Astrophysics · Physics 2013-02-04 Zhongmu Li

We study the formation of massive Population III binary stars using a newly developed radiation hydrodynamics code with the adaptive mesh refinement and adaptive ray-tracing methods. We follow the evolution of a typical primordial…

Astrophysics of Galaxies · Physics 2020-06-16 Kazuyuki Sugimura , Tomoaki Matsumoto , Takashi Hosokawa , Shingo Hirano , Kazuyuki Omukai

In this paper, we combine the stellar spectral synthesis code STARBURST 99, the nebular modelling code MAPPINGS IIIq, a 1-D dynamical evolution model of \HII regions around massive clusters of young stars and a simplified model of…

The absence of direct high redshift observations poses a significant challenge in understanding the properties of first stars. Nonetheless, the cumulative effect of entire stellar populations can be studied with current data. In this work…

Cosmology and Nongalactic Astrophysics · Physics 2025-02-07 Omer Zvi Katz , Diego Redigolo , Tomer Volansky

One of the most reliable means of studying the stellar interior is through the apsidal motion in double line eclipsing binary systems since these systems present errors in masses, radii, and effective temperatures of only a few per cent. On…

Solar and Stellar Astrophysics · Physics 2023-07-05 A. Claret

Sub-Neptune-sized exoplanets represent one of the most common types of planets in the Milky Way, yet many of their properties are unknown. Here, we present a prescription to adapt the capabilities of the stellar evolution toolkit Modules…

Earth and Planetary Astrophysics · Physics 2016-11-15 Howard Chen , Leslie A. Rogers

As the reconstruction of the star-formation histories (SFH) of galaxies from spectroscopic data becomes increasingly popular, we explore the best age resolution achievable with stellar population synthesis (SPS) models, relying on different…

Astrophysics of Galaxies · Physics 2024-01-19 Stefano Zibetti , Edoardo Rossi , Anna R. Gallazzi

We aim to provide the first data-constrained estimate of the metal-free (Population III; Pop III) star formation rate density $\dot{\rho}_{*}^{III}$ required at high-redshifts ($z \gtrsim 16$) in order to reproduce both the amplitude and…

Cosmology and Nongalactic Astrophysics · Physics 2020-06-11 Atrideb Chatterjee , Pratika Dayal , Tirthankar Roy Choudhury , Raffaella Schneider