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Binary stars are common in star clusters and galaxies, but the detailed effects of binary evolution are not taken into account in some colour-magnitude diagram (CMD) studies. This paper studies the CMDs of twelve globular clusters via…

Solar and Stellar Astrophysics · Physics 2015-06-12 Zhongmu Li , Caiyan Mao , Ruheng Li , Ruxi Li , Maocai Li

Color-Magnitude Diagrams (CMDs) are plots that compare the magnitudes (luminosities) of stars in different wavelengths of light (colors). High nonlinear correlations among the mass, color, and surface temperature of newly formed stars…

Applications · Statistics 2016-04-26 David A. van Dyk , Steven DeGennaro , Nathan Stein , William H. Jefferys , Ted von Hippel

We present a simple approach for obtaining robust values of astrophysical parameters from the observed colour-magnitude diagrams (CMDs) of star clusters. The basic inputs are the Hess diagram built with the photometric measurements of a…

Solar and Stellar Astrophysics · Physics 2015-05-20 C. Bonatto , F. Campos , S. O. Kepler , E. Bica

This work presents an approach (fitCMD) designed to obtain a comprehensive set of astrophysical parameters from colour-magnitude diagrams (CMDs) of star clusters. Based on initial mass function (IMF) properties taken from isochrones, fitCMD…

Instrumentation and Methods for Astrophysics · Physics 2018-12-12 Charles Bonatto

We present the analysis of a deep colour-magnitude diagram (CMD) of NGC 1831, a rich star cluster in the LMC. The data were obtained with HST/WFPC2 in the F555W (~V) and F814W (~I) filters, reaching m_555 ~ 25. We discuss and apply a method…

Astrophysics · Physics 2009-11-07 L. O. Kerber , B. X. Santiago , R. Castro , D. Valls-Gabaud

We present detailed comparisons between high quality observational colour-magnitude diagrams (CMDs) of open star clusters and synthetic CMDs based on MonteCarlo numerical simulations. The comparisons account for all of the main parameters…

Astrophysics · Physics 2009-11-10 Jasonjot Singh Kalirai , Monica Tosi

The color-magnitude diagram (CMD) of globular cluster NGC1651 has special structures including a broad main sequence, an extended main sequence turn-off and an extended red giant clump. The reason for such special CMDs remains unclear. In…

Solar and Stellar Astrophysics · Physics 2015-06-24 Zhongmu Li , Caiyan Mao , Li Chen

We have tested the application to Sloan Digital Sky Survey data of the software package MATCH, which fits color-magnitude diagrams (CMDs) to estimate stellar population parameters and distances. These tests on a set of six globular clusters…

Aims. We present here a new theoretical approach to population synthesis. The aim is to predict colour magnitude diagrams (CMDs) for huge numbers of stars. With this method we generate synthetic CMDs for N-body simulations of galaxies.…

Solar and Stellar Astrophysics · Physics 2015-06-05 S. Pasetto , C. Chiosi , D. Kawata

The code IAC-star is presented. It generates synthetic HR and color-magnitude diagrams (CMDs) and is mainly aimed to star formation history studies in nearby galaxies. Composite stellar populations are calculated on a star by star basis, by…

Astrophysics · Physics 2014-10-13 A. Aparicio , C. Gallart

State-of-the-art cosmological hydrodynamical simulations have star particles with typical mass between $\sim 10^8$ and $\sim 10^3$ M$_{\odot}$ according to resolution, and treat them as simple stellar populations. On the other hand,…

Astrophysics of Galaxies · Physics 2018-07-31 Milena Valentini , Alessandro Bressan , Stefano Borgani , Giuseppe Murante , Léo Girardi , Luca Tornatore

We present a comprehensive study of the applications of the pixel color-magnitude diagram (pCMD) technique for measuring star formation histories (SFHs) and other stellar population parameters of galaxies, and demonstrate that the technique…

Astrophysics of Galaxies · Physics 2019-05-15 B. A. Cook , Charlie Conroy , Pieter van Dokkum , Joshua S. Speagle

We present the underlying relations between colour-magnitude diagrams (CMDs) and synthesis models through the use of stellar luminosity distribution func- tions. CMDs studies make a direct use of the stellar luminosity distribution function…

Cosmology and Nongalactic Astrophysics · Physics 2012-08-02 Miguel Cervino , Enrique Perez , Nestor Sanchez , Carlos Roman-Zuniga , David Valls-Gabaud

Multiple stellar populations (MPs) in most star clusters older than 2 Gyr, as seen by lots of spectroscopic and photometric studies, have led to a significant challenge to the traditional view of star formation. In this field, space-based…

We investigate the color-magnitude diagram (CMD) of cluster galaxies in the hierarchical $\Lambda$-CDM cosmological scenario using both single stellar populations and simple galaxy models. First, we analyze the effect of bursts and mergers…

Astrophysics of Galaxies · Physics 2019-01-16 Mauro Sciarratta , Cesare Chiosi , Mauro D'Onofrio , Stefano Cariddi

This note presents theoretical color-magnitude diagrams (CMDs) and metallicity evolution for Galactic multi-population models coupled to stellar evolution models for systems undergoing stripping and re-accretion of ambient material, called…

Astrophysics · Physics 2009-11-11 G. Valle , M. Cignoni , S. N. Shore

With HST, colour-magnitude diagrams (CMDs) can be obtained for young star clusters well beyond the Local Group. Such data can help constrain cluster ages and metallicities, and also provide a reference against which intermediate- and high…

Astrophysics · Physics 2007-07-03 S. S. Larsen

The analysis of stellar populations has, by and large, been developed for two limiting cases: spatially-resolved stellar populations in the color-magnitude diagram, and integrated light observations of distant systems. In between these two…

Astrophysics of Galaxies · Physics 2016-08-17 Charlie Conroy , Pieter van Dokkum

We present a novel approach to draw the synthetic color-magnitude diagram of galaxies, which can provide - in principle - a deeper insight in the interpretation and understanding of current observations. In particular, we `light up' the…

Astrophysics of Galaxies · Physics 2016-07-27 Fiorenzo Vincenzo , Francesca Matteucci , Thomas J. L. de Boer , Michele Cignoni , Monica Tosi

The theoretical relation between the number of post main sequence stars from stellar populations and their total mass in investigated. This is used to derive some basic relations between the stellar number counts of stellar populations with…

Astrophysics · Physics 2007-05-23 L. Greggio
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