Bruzual & Charlot Papers

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Title:
A Database for Galaxy Evolution Modeling
Authors:
Leitherer, Claus; Alloin, Danielle; Fritz-v. Alvensleben, Uta; Gallagher, John S.; Huchra, John P.; Matteucci, Francesca; O'Connell, Robert W.; Beckman, John E.; Bertelli, Gianpaolo; Bica, Eduardo; Boisson, Catherine; Bonatto, Charles; Bothun, Gregory D.; Bressan, Alessandro; Brodie, Jean P.; Bruzual, Gustavo; Burstein, David; Buser, Roland; Caldwell, Nelson; Casuso, Emilio; Cerviño, Miguel; Charlot, Stephane; Chavez, Miguel; Chiosi, Cesare; Christian, Carol A.; Cuisinier, Francois; Dallier, Richard; de Koter, Alex; Delisle, Sonya; Diaz, Angeles I.; Dopita, Michael A.; Dorman, Ben; Fagotto, Franco; Fanelli, Michael N.; Fioc, Michel; Garcia-Vargas, Maria Luisa; Girardi, Leo; Goldader, Jeffrey D.; Hardy, Eduardo; Heckman, Timothy M.; Iglesias, Jorge; Jablonka, Pascale; Joly, Monique; Jones, Lewis; Kurth, Oliver; Lancon, Ariane; Lejeune, Thibault; Loxen, Johannes; Maeder, Andre; Malagnini, Maria Lucia; Marigo, Paola; Mas-Hesse, J. Miguel; Meynet, Georges; Moller, Claudia S.; Molla, Mercedes L.; Morossi, Carlo; Nasi, Emma; Nichols, Joy S.; Odegaard, Knut J. R.; Parker, Joel Wm.; Pastoriza, Miriani G.; Peletier, Reynier; Robert, Carmelle; Rocca-Volmerange, Brigitte; Schaerer, Daniel; Schmidt, Alex; Schmitt, Henrique R.; Schommer, Robert A.; Schmutz, Werner; Roos, Margarida Serote; Silva, Laura; Stasinska, Grazyna; Sutherland, Ralph S.; Tantalo, Rosaria; Traat, Peeter; Vallenari, Antonella; Vazdekis, Alexandre; Walborn, Nolan R.; Worthey, Guy; Wu, Chi-Chao
Journal:
Publications of the Astronomical Society of the Pacific, v.108, p.996-1017 (PASP Homepage)
Publication Date:
11/1996
Origin:
PASP
PASP/ApJ Keywords:
GALAXIES: EVOLUTION, ASTRONOMICAL DATA BASES
Abstract Copyright:
(c) 1996: Astronomical Society of the Pacific
Bibliographic Code:
1996PASP..108..996L

Abstract

This paper represents a collective effort to provide an extensive electronic database useful for the interpretation of the spectra and evolution of galaxies. A broad variety of empirical and theoretical data are discussed here, and the data are made fully available in the AAS CD-ROM Series, Vo. 7. Several empirical stellar libraries are part of this database. They cover the ultraviolet spectral range observed with IUE, optical data from different ground-based telescopes, and ground-based infrared data. Spectral type coverage depends on the wavelength, but it is mostly complete for types O and M and luminosity classes V to I. A large metallicity range is covered as well. Theoretical libraries of selected spectral indices of cool stars and of stellar continuum fluxes in the temperature range 2000 K to 50,000 K, as well as Wolf-Rayet energy distributions are presented. Several libraries of star clusters and early-type galaxies have been selected for this database. We discuss an extensive set of empirical spectra templates covering the wavelength region from 1200 - 9800 A, as well as narrow-band line indices in a large number of passbands. Bench-mark spectra of nearby galaxies for model tests are included as well. We compiled numerous evolutionary models and isochrones for stars of all mass ranges of interest, wide metallicity range, and for all evolutionary phases, including the pre-main-sequence phase. The majority of the models have been computed by the Geneva and Padova groups. Evolutionary synthesis models computed by several independent groups are made available. They can be applied to old and young systems, and are optimized with respect to different aspects of input physics. The model predictions include stellar (colors, magnitudes, absorption features) and nebular (emission-line fluxes) properties. Finally, we present models of ionized gas to be used for the interpretation of active galactic nuclei and young star-forming galaxies. The community is encouraged to make use of this electronic database and to perform a critical comparison between the individual datasets. (SECTION: Galaxies)

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Title:
Spectral evolution of stellar populations using isochrone synthesis
Authors:
Bruzual A., Gustavo; Charlot, Stephane
Affiliation:
AA(Centro de Investigaciones de Astronomia, Merida, Venezuela), AB(Space Telescope Science Inst., Baltimore, MD)
Journal:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 2, p. 538-553. (ApJ Homepage)
Publication Date:
03/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL MODELS, ASTRONOMICAL SPECTROSCOPY, STELLAR EVOLUTION, STELLAR SPECTRA, ASTRONOMICAL PHOTOMETRY, COLOR-MAGNITUDE DIAGRAM, FAR ULTRAVIOLET RADIATION, METALLICITY, NEAR INFRARED RADIATION, PLANETARY NEBULAE, RED SHIFT, SUN, WHITE DWARF STARS
Bibliographic Code:
1993ApJ...405..538B

Abstract

We combine the photometric model of isochrone synthesis recently published by Chariot and Bruzual (1991) with an updated library of stellar spectra to predict the spectral evolution of stellar populations with solar metallicity. The library of spectra assembled here supersedes other existing libraries by its spectral range, its complete coverage of the color-magnitude diagram, and its inclusion of observed near-infrared spectra out to 2.56 micron. Also, the spectra are distributed on the stellar evolutionary tracks using optical/near-infrared color calibrations, as an improvement over models that used a single color of the effective temperature of the stars alone. The spectroscopic results obtained here confirm and extend the previous photometric predictions of the isochrone synthesis models while including the recent revision of evolutionary tracks for stars between 1.3 and 2.5 solar masses by their authors.

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Title:
Stellar population synthesis revisited
Authors:
Charlot, Stephane; Bruzual, A. Gustavo
Affiliation:
AA(Space Telescope Science Institute, Baltimore, MD; Paris VII, Universite; Paris, Observatoire, France), AB(Centro de Investigaciones de Astronomia, Merida, Venezuela)
Journal:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 126-140. Research supported by the Ministere de la Recherche et de la Technologie and Space Telescope Science Institute. (ApJ Homepage)
Publication Date:
01/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL PHOTOMETRY, ASYMPTOTIC GIANT BRANCH STARS, COLOR-MAGNITUDE DIAGRAM, GALACTIC EVOLUTION, STELLAR EVOLUTION, STAR CLUSTERS, STELLAR COLOR, STELLAR MODELS, UBV SPECTRA
Bibliographic Code:
1991ApJ...367..126C

Abstract

The isochrone synthesis method is introduced as a population synthesis method for galaxies. The method permits accurate distributions of stars in the theoretical color-magnitude diagram to be computed for any stellar population and thereby circumvent the problems faced by earlier techniques. A set of evolutionary tracks extending from the ZAMS up to the beginning of the white-dwarf cooling sequence is compiled to optimize the models. Comparison of model predictions with observational data leads to the conclusion that the isochrone synthesis can reproduce the observed colors of stellar populations of ages from a few tens of millions of yr to a Hubble time.