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Stellar evolution models are a cornerstone of young star astrophysics, which necessitates that they yield accurate and reliable predictions of stellar properties. Here, I review the current performance of stellar evolution models against…

Solar and Stellar Astrophysics · Physics 2016-02-03 Gregory A. Feiden

It takes years of effort employing the best telescopes and instruments to obtain high-quality stellar photometry, astrometry, and spectroscopy. Stellar evolution models contain the experience of lifetimes of theoretical calculations and…

Stellar evolution theory has been extraordinarily successful at explaining the different phases under which stars form, evolve and die. While the strongest constraints have traditionally come from binary stars, the advent of…

Astrophysics of Galaxies · Physics 2016-07-12 D. Valls-Gabaud

Determining the sequence of events in the formation of stars and planetary systems and their time-scales is essential for understanding those processes, yet establishing ages is fundamentally difficult because we lack direct indicators. In…

Solar and Stellar Astrophysics · Physics 2015-06-18 David R. Soderblom , Lynne A. Hillenbrand , Rob D. Jeffries , Eric E. Mamajek , Tim Naylor

Binary systems, in particular eclipsing binaries, are essential sources of our knowledge of the fundamental properties of stars. The ages of binaries, members of open clusters, are constrained by their own fundamental properties and by…

Solar and Stellar Astrophysics · Physics 2015-05-20 Mutlu Yildiz

Star clusters are ideal tracers of star formation activity in systems outside the volume that can be studied using individual, resolved stars. These unresolved clusters span orders of magnitude in brightness and mass, and their formation is…

Cosmology and Nongalactic Astrophysics · Physics 2011-07-20 I. S. Konstantopoulos , K. Fedotov , S. C. Gallagher , A. Maybhate , P. R. Durrell , J. C. Charlton

In the era of large-scale surveys of stars in the Milky Way, stellar ages are crucial for studying the evolution of the Galaxy. But determining ages of field stars is notoriously difficult; therefore, we attempt to determine benchmark ages…

Solar and Stellar Astrophysics · Physics 2018-10-17 Christian L. Sahlholdt , Sofia Feltzing , Lennart Lindegren , Ross P. Church

We present new evolutionary stellar models suitable for old Population I clusters, discussing both the consequences of the most recent improvements in the input physics and the effect of element diffusion within the stellar structures.…

Astrophysics · Physics 2009-10-31 V. Castellani , S. Degl'Innocenti , M. Marconi

Star clusters are fundamental units of stellar feedback and unique tracers of their host galactic properties. In this review, we will first focus on their constituents, i.e.\ detailed insight into their stellar populations and their…

Our ability to determine stellar ages from measurements of stellar rotation, hinges on how well we can measure the dependence of rotation on age for stars of different masses. Rotation periods for stars in open clusters are essential to…

Astrophysics · Physics 2015-05-13 Soren Meibom

This study presents a comprehensive analysis of the youngest stellar clusters in the Large Magellanic Cloud (LMC), utilising a multi-wavelength approach. We analyse data spanning from infrared to ultraviolet wavelengths, with the goal of…

Astrophysics of Galaxies · Physics 2025-03-13 Ricardo Chávez , Rosa Amelia González-Lópezlira , Gustavo Bruzual

Star clusters are evolving n-body systems. We discuss the early dynamics of star clusters, the process of primordial mass segregation and clustering observed in certain young clusters. We discuss how the dynamics coupled with stellar…

Solar and Stellar Astrophysics · Physics 2018-10-15 Priya Shah

In this review, we summarize the observed statistical properties of visual binaries in various young stellar clusters. The binary frequency, orbital period distribution and mass ratio distribution are considered for populations of both…

Astrophysics · Physics 2007-05-23 G. Duchene , J. Bouvier , J. Eisloffel , T. Simon

We infer the ages of three young stellar clusters, NGC 2004, NGC 7419, and NGC 2100, using Stellar Ages, a statistical algorithm designed to infer stellar population properties from color magnitude diagrams. Recent studies have revealed…

We combine archival images for the nearby galaxy M33 (Triangulum Galaxy) from the ultraviolet (UV) to the infrared (IR) to derive ages, masses, and extinctions for the young star cluster population, and compare our physical parameters with…

Astrophysics of Galaxies · Physics 2021-12-22 Caitlin Moeller , Daniela Calzetti

We investigate the properties and evolution of star particles in two simulations of isolated spiral galaxies, and two galaxies from cosmological simulations. Unlike previous numerical work, where typically each star particle represents one…

We highlight the importance of eclipsing double-line binaries in our understanding on star formation and evolution. We review the recent discoveries of low-mass and sub-stellar eclipsing binaries belonging to star-forming regions, open…

Solar and Stellar Astrophysics · Physics 2021-01-06 Nicolas Lodieu , Ernst Paunzen , Miloslav Zejda

The knowledge of stellar ages directly impacts the characterization of a planetary system as it puts strong constraints on the moment when the system was born. Unfortunately, the determination of precise stellar ages is a very difficult…

Solar and Stellar Astrophysics · Physics 2015-10-21 Savita Mathur

We present the first results of a new technique to detect, locate, and characterize young dissolving star clusters. Using HST/ACS archival images of the nearby galaxy IC2574, we performed stellar PSF photometry and selected the most massive…

Astrophysics · Physics 2009-12-04 Anne Pellerin , Martin J. Meyer , Jason Harris , Daniela Calzetti

We review recent work that investigates the formation of stellar clusters, ranging in scale from globular clusters through open clusters to the small scale aggregates of stars observed in T associations. In all cases, recent advances in…

Astrophysics · Physics 2007-05-23 Cathie J. Clarke , Ian A. Bonnell , Lynne A. Hillenbrand