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Shortcut to the SSP models |
Selected publications and links to the data: | |
Part II (before 2003) | |
| (see Part I for publications from 2003 to date) | |
Bertone, E., Buzzoni, A., Rodriguez-Merino, L.H., Chavez, M.:
"New insights in high-resolution spectroscopy: a wide theoretical library of R=500,000 stellar spectra", 2002, proc. of IAU Symp. no. 210, "Modeling of Stellar Atmosphere" - Uppsala, Sweden, 17-21 June 2002 (in press). |
We present an extended theoretical library of over 800 synthetic stellar spectra, covering SED in
the λ = [3500-7000 Å] range, at inverse resolution R=500,000. The library, based
on the ATLAS9 model atmospheres, spans a large volume in the (T_eff, log g, [M/H]) fundamental
parameters space, and can be profitably applied to different research fields dealing both with
the study of single stars and stellar aggregates, through population synthesis models.
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Buzzoni, A.:
"Ultraviolet properties of primeval galaxies: theoretical models from stellar population synthesis", 2002, Astron. Journal, 123, 1188. |
The ultraviolet luminosity evolution of star-forming galaxies is explored from
the theoretical point of view, especially focussing on the theory of UV energetics
in simple and composite stellar populations and its relationship with
star formation rate and other main evolutionary parameters.
The role of dust absorption in the observation of high-redshift galaxies is assessed,
comparing model output and observed spectral energy distribution of local galaxy samples.
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Buzzoni, A.:
"Population synthesis and the diagnostics of high-redshift galaxies", 2002, proc. of "New quests in stellar astrophysics: the link between stars and cosmology", eds. M. Chavez et al., Kluwer Academic Publishers: Dordrecht, p.189 |
The effect of redshift on the observation of distant galaxies is briefly discussed emphasizing the possible sources of bias in the interpretation of high-z data. The physical self-consistency of evolutionary population synthesis models is also essessed, for a more appropriate use of this important tool to investigate distinctive properties of primeval galaxies. |
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Bertone, E., Buzzoni, A., Chavez, M., Rodriguez, L.:
"A critical appraisal of ATLAS9 and NextGen 5 model atmospheres", 2002, proc. of "New quests in stellar astrophysics: the link between stars and cosmology", eds. M. Chavez et al., Kluwer Academic Publishers: Dordrecht, p.27. |
The fitting atmosphere parameters (Teff, g, and [Fe/H]) for over 300 stars in
the Gunn and Striker (1983) and Jacoby et al. (1984) catalogs have been obtained
relying on the Kurucz (1992) ATLAS9 and Hauschildt et al. (1999) NextGen5 synthesis
models. The output results are compared, and a critical appraisal of both
theoretical codes is performed.
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Massarotti, M., Iovino, A., Buzzoni, A., Valls-Gabaud, D.:
"New insights on the accuracy of photometric redshift measurements", 2001, Astron. Astrophys., 380, 425. |
The Hubble Deep Field North, supplemented by new HDF South redshift data, is used to study the residual distribution between photometric and spectroscopic redshift estimates in the range 0 < z_spec < 6. Model libraries are found to provide a good description of the galaxy population at z_spec < 1.5, while the match of z_spec > 2.0 observations requires to account for dust absorption by the interstellar and intergalactic media. |
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Massarotti, M., Iovino, A., Buzzoni, A.:
"Dust absorption and the cosmic ultraviolet flux density", 2001, Astrophys. Journal, 559, L105 |
We study the evolution of the galaxy UV luminosity density as a function of redshift in the Hubble
Deep Field-North and estimate the amount of energy absorbed by dust and hidden from optical observations.
At redshifts of 1 < z < 4.5, the global energy observed in the UV rest-frame at 1500 A corresponds to
only 7%-11% of the stellar energy output, the rest of it being absorbed by dust and re-emitted in the far-IR.
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Buzzoni, A., Chavez, M., Malagnini, M.L., Morossi, C.:
"Lick spectral indices for super metal-rich stars", 2001, Publ. Astron. Soc. of Pacific, 113, 1365. |
The Lick Fe5015, Fe5270, Fe5335, Mgb and Mg2 indices are presented for 139 candidate SMR stars of different luminosity class studied in Malagnini et al. (2000). Evidence is found for a standard (i.e. [Mg/Fe]~0) Mg vs. Fe relative abundance. Both the Worthey et al. (1994) and Buzzoni et al. (1992, 1994) fitting functions are found to suitably match the data at super-solar metallicity regimes. |
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Massarotti, M., Iovino, A., Buzzoni, A.:
"A critical appraisal of the SED fitting method to estimate photometric redshifts", 2001, Astron. Astrophys., 368, 74. |
We analyze the stability of the photometric redshift estimate with the SED fitting method with respect to the choice of the galaxy template. An application to the Hubble Deep Field North is discussed. |
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Bertone, E., Buzzoni, A.:
"Spectral classification of stars using synthetic model atmospheres", 2001, proc. of the 1st COROT-MONS- MOST Ground-based Support Workshop (Ghent 11-12/01/2001), ed. C. Sterken, Brussel University, p. 75 |
We devised a straightforward procedure to derive the atmosphere fundamental parameters of
stars across the different MK spectral types by comparing mid-resolution spectroscopic observations
with theoretical grids of synthetic spectra. The results of a preliminary experiment, by matching
the Gunn and Stryker, and the Jacoby et al. spectrophotometric atlases with the Kurucz models, are
discussed.
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Cellone, S.A., Buzzoni, A.:
"On the shape of luminosity profile of dwarf galaxies as a distance indicator: the NGC 5044 group revisited", 2001, Astron. Astrophys., 369, 742 |
We discuss the main error sources in profile fitting procedures for galaxies with more than one physical component. New optical observations of the dwarf galaxy N50 in the NGC5044 group are presented in this regard showing that this object may be at an intermediate evolutionary stage between blue compact dwarfs (BCDs) and dwarf ellipticals (dEs). |
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Buzzoni, A.:
"UV properties of primeval galaxies", 2001, proc. of the Xth Rencontres de Blois, "The birth of galaxies", ed. B. Guiderdoni et al., Gioi Publishers: Ha Noi, p.453. |
The problem of UV properties of primeval galaxies is briefly assessed from the theoretical point of view discussing its impact on the definition of the cosmological model. |
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Malagnini, M.L, Morossi, C., Buzzoni, A., Chavez, M.:
"Observations and atmospheric parameters of SMR candidates", 2000, Publ. Astron. Soc. of Pacific, 112, 1455. |
The spectroscopic properties of a sample of 92 Pop I bright stars with literature values of [Fe/H] > +0.1 are reviewed in order to study the metallicity scale at supersolar regimes. We find that a ``genuine'' SMR stellar component in the Galactic disk exists with more than one-fourth of the stars in our sample exceeding [Fe/H]> +0.2 dex. |
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Saracco, P., D'Odorico, S., Moorwood, A., Buzzoni, A., Cuby, J.G., Lidman, C.:
"IR colors and sizes of faint galaxies", 1999, Astron. Astrophys., 349, 751. |
Deep J and K galaxy counts from ESO NTT observations are discussed. We show that the blue, small sources dominating the faint IR counts are compatible with an increasing contribution of sub-L(*) galaxies when going to fainter apparent magnitudes. This points to a steep (α <<-1) faint end of the local infrared luminosity function. |
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Molinari, E., Buzzoni, A., Chincarini, G.:
"Photometry of seven clusters of galaxies at intermediate redshift (z = 0.15-0.50)", 1996, Astron. Astrophys. Suppl. Series, 119, 391. |
Gunn g, r, i photometry for the 7 clusters MRC0254-274, Cl0317+15, MS0418.3-3844, Cl1141-283, A1689, A3594, S0781B is presented. For each cluster we derived the spatial distribution properties, and discussed the colors of its galaxy population. |
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Cacciari, C., Fusi Pecci, F., Bragaglia, A., Buzzoni, A.:
"IUE observations of blue horizontal branch stars in the globular cluster M3 and NGC 6752", 1995, Astron. Astrophys., 301, 684. |
IUE observations of 3 blue horizontal branch stars in M 3 plus 9 stars in NGC 6752 are presented. The physical parameters of these stars have been derived from the Kurucz model atmospheres, and compared with the ZAHB evolutionary tracks by Dorman et al. (1993). All the stars, including those that appear to be evolved off the ZAHB, are consistent with the theoretical predictions. |
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Buzzoni, A.:
"Evolutionary population synthesis in stellar systems. II. Early-type galaxies", 1995, Astrophys. Journal Suppl. Series, 98, 69. |
Evolutionary population synthesis models of early-type galaxies are presented. Optical and infrared synthetic colors and spectral indices, including the infrared indices of CO and H2O, are analyzed, exploring their selective sensitivity to the distinctive parameters of the stellar populations. Evolutionary (e + k) corrections are given in the Johnson B, V, and K bands, and in the Gunn g, r, and i system for six different cosmological models. |
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Molinari, E., Buzzoni, A., Chincarini, G., Pedrana, M.D.: "The very red halo of the cD galaxy in A3284", 1994, Astron. Astrophys., 292, 54. |
We present deep CCD surface photometry in the Gunn g, r, i system and spectroscopy of the cD galaxy at the center of the cluster A 3284 at z = 0.15. The cD halo shows exceedingly red colors, that are consistent with a prevailing contribution of a population of unevolved M-dwarf stars. |
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Buonanno, R., Corsi, C.E., Buzzoni, A., Cacciari, C., Ferraro, F., Fusi Pecci, F.:
"The stellar population of the globular cluster M3. I. Photographic photometry of 10,000 stars", 1994, Astron. Astrophys., 290, 69. |
The photographic colour-magnitude diagram of a complete sample of 10,000 stars in the globular cluster M 3, down to V<21.5, is presented with very high internal accuracy to obtain complete samples over well defined areas. |
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Covino, S., Pasinetti, L., Malagnini, M.L., Buzzoni, A.:
"Synthetic and observed photometric indices for globular clusters in the Galaxy and M31", 1994, Astron. Astrophys., 289, 775. |
The Buzzoni (1989) grid of synthetic spectral energy distributions, representative of old stellar populations, is used to derive Johnson and Washington integrated colors to compare with the observations of 120 globular clusters in the Galaxy and to 159 objects of the globular cluster system of M 31. |
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Molinari, E., Pedrana, D., Banzi, M., Buzzoni, A., Chincarini, G.:
"Multicolor photometry of cluster of galaxies: A3284, A3305 and A1942", 1994, Astron. Astrophys, Suppl. Series, 103, 245. |
We present Gunn multicolor photometry for the three clusters of galaxies A3284, A3305 and A1942 at redshift z~0.2. The c-m diagrams and the g-i colour distribution, as well as the two-colour diagrams are used to single out early-type galaxies and spirals on the basis of their different photometric properties. |
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Buzzoni, A., Mantegazza, L., Gariboldi, G.:
"Chemical enrichment in elliptical galaxies through the study of Iron and Hß spectral indices", 1994, Astron. Journal, 107, 513. |
Chemical evolution of elliptical galaxies and globular clusters is addressed through a combined study of the Iron Fe5270 and Fe5335, and Hß line strength. Analytical fitting functions are derived for the three indices and SSP synthesis is performed exploring the integrated spectral indices vs. relevant age, metallicity, and IMF parameters. The problem of non-standard metal partition (with [α/Fe] > 0 metal enhancement) is assessed. |
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Buzzoni, A., Chincarini, G., Molinari, E.:
"Galaxy colors in distant clusters as a test for the world model", 1993, Astrophys. Journal, 410, 499. |
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Buzzoni, A.:
"Statistical properties of stellar populations and surface-brightness fluctuations in galaxies", 1993, Astron. Astrophys., 275, 433. |
The statistical concepts of effective stellar contributors, and effective luminosity of a stellar population are introduced and discussed in the framework of the SSP theory relying on Buzzoni's (1989) models. The results have been applied to the Tonry-Schneider (1988) method on galaxy surface-brightness fluctuations deriving new distances for M32 and galaxies in the Virgo, Leo, Fornax, and Eridanus clusters. |
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Buzzoni, A., Gariboldi, G., Mantegazza, L.:
"The Magnesium Mg2 index as an indicator of metallicity in elliptical galaxies", 1992, Astron. Journal, 103, 1814. |
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Buzzoni, A., Cacciari, C., Fusi Pecci, F., Buonanno, R., Corsi,
C.E.: "IUE observations of UV-bright stars in M3", 1992, Astron. Astrophys., 254, 110. |
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Molinari, E., Buzzoni, A., Chincarini, G.:
"Photometry of distant clusters of galaxies: evolutionary features in the cluster 2158+0351 (z = 0.45)", 1990, Monthly Notices Roy. Astron. Soc., 246, 576. |
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Buzzoni, A.:
"Evolutionary population synthesis in stellar systems. I. A global approach", 1989, Astrophys. Journal Suppl. Series, 71, 817. |
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Buzzoni, A., Fusi Pecci, F., Buonanno, R., Corsi, C.E.:
"Helium abundance in globular clusters: the R-method", 1983, Astron. Astrophys., 128, 94. |
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AB/Apr 2011 |
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