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Selected publications and links to the data:

Part II (before 2005)

(see Part I for publications from 2005 to date)


Buzzoni, A., Arnaboldi, M.:
"Planetary Nebulae as tracers of the Intergalactic stellar background: a population synthesis theoretical approach", 2004, ESO intl. Workshop on "Planetary Nebulae beyond the Milky Way". To appear on the ESO Astrophysics Symposia, eds. L. Stanghellini, J.R. Walsh & N.G. Douglas (Springer Verlag: Heidelberg), p. 355.

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Relying on original population synthesis models, we assess the relationship between the population of planetary nebulae (PNe) and a given parent stellar population from a theoretical point of view. A tentative application to the Virgo cluster allows us to place a lower limit at ~7% for the global B luminosity of the cluster provided by "loose" intergalactic stars.

 

Bertone, E., Buzzoni, A., Chavez, M., Rodriguez-Merino, L.H.:
"ATLAS vs. NextGen model atmospheres: a combined analysis of synthetic spectral energy distributions", 2004, Astron. Journal, 128, 829.

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An exhaustive critical appraisal of the two most popular theoretical codes for stellar atmosphere synthesis, i.e. Kurucz' ATLAS9 and Hauschildt et al.'s PHOENIX/NextGen.

 

Bertone, E., Buzzoni, A., Chavez, M., Rodriguez-Merino, L.:
"High-resolution spectral synthesis: 2 Å mapping of UV-optical emission of stellar populations", 2003, presented at the MPA workshop on "Stellar Populations 2003" - Garching, Germany 6-10 October 2003.
Proceedings are available in electronic form only at this Web address

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We explore, from the theoretical point of view, the spectral properties of SSPs in the ultraviolet wavelength range, shortward of the 4000 Å break. Our models rely on a new stellar library of high-resolution (2 Å FWHM) synthetic spectra, based on the Kurucz model atmospheres, coupled with the Buzzoni population synthesis code. Some preliminary results of our project aimed at singling out those spectral features that can selectively track age and metallicity in stellar aggregates are presented and briefly discussed.

 

Cellone, S.A., and Buzzoni, A.:
"La población de galaxias de baja luminosidad en el grupo de NGC 5044", 2003, memorias de la Reunión Anual de la Asociación Argentina de Astronomía, Buenos Aires, Argentina, 16-19/Sep/2002 -- Published on the Boletín de la Asociación Argentina de Astronomía, vol. 46, p. 93-94

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We present preliminary results of a systematic spectrophotometric study of the dwarf- and low-luminosity galaxy population (19.5 < B(T) < 15.5) in the group of NGC 5044. Our work aims at obtaining membership and morphological classification as well as color properties of this class of galaxies in the framework of more general dynamical and environmental study of the NGC 5044 group.

 

Chavez, M., Rodriguez-Merino, L.H., Bertone, E., Buzzoni, A.:
"Spectroscopic indices of stars: a theoretical approach", 2002, proc. of the Intl. Symp. on "Astrophysics Research and the Dialog between Science and Religion", Vatican Observatory,Eds. C.D. Impey and C.E. Petry (in press)

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A new grid of theoretical absorption indices based on the Kurucz library of synthetic spectra is presented. Models encompass the wavelength interval from 850 to 7000 Å, with an inverse resolution R = 50,000 (UV range) and 500,000 (optical). A total of 51 ultraviolet and optical narrow-band indices defined in the literature have been measured therefrom and calibrated in terms of the atmosphere parameters.

 

Kinman, T.D., Cacciari, C., Bragaglia, A., Buzzoni, A., Spagna, A.:
"The vertical structure of the halo rotation", 2003, proc. of the JENAM workshop on "Galactic and Stellar Dynamics" - Porto, Portugal 3-6 September 2002, Eds. C. M. Boily, P. Pastsis, S. Portegies Zwart, R. Spurzem & C. Theis, EAS Publ. Series, 10, 115

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New GSC-II proper motions of RR Lyrae and Blue Horizontal Branch (BHB) stars near the North Galactic Pole are used to show that the Galactic Halo 5 kpc above the Plane has a significantly retrograde galactic rotation.

 

Buzzoni, A.:
"UV properties and evolution of high-redshift galaxies", 2003, proc. of the ASP Conf. Ser. no. 297 "Star Formation through Time" - Granada, Spain 24-28/Sep/2002, Eds. E. Perez, R. Gonzalez-Delgado, G. Tenorio-Tagle (ASP: San Francisco), p. 471

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I assess the problem of morphological and photometric evolution of high-redshift galaxies in the ultraviolet wavelength range. My discussion will partly rely on a new set of template galaxy models, in order to infer the expected changes along the Hubble morphological sequence at the different cosmic epochs. The impact of evolution on the faint-end galaxy luminosity function at z~1 and beyond will also be evaluated and briefly discussed.

 

Rodriguez-Merino, L.H., Chavez, M., Bertone, E., Buzzoni, A.:
" An updated FUV-blue stellar library for modelling stellar systems", 2003, proc. of the ASP Conf. Ser. no. 297 "Star Formation through Time" - Granada, Spain 24-28/Sep/2002, Eds. E. Perez, R. Gonzalez-Delgado, G. Tenorio-Tagle (ASP: San Francisco), p. 237

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We present a new theoretical library of stellar spectra computed at high resolution (R = 50,000). The library covers the wavelength interval from 850 to 4750 Å, and spans a wide temperature range from 3000 K to 50,000 K across the whole MK types (from dwarf to super-giant stars) in the H-R diagram.

 

Bertone, E., Rodriguez-Merino, L.H., Chavez, M., Buzzoni, A.:
"A library of UV-optical high-resolution synthetic spectra for the study of stellar aggregates", 2003, proc. of "Galaxy Evolution: Theory and Observations" - Cozumel, Mexico 8-12 April 2002, Eds. V. Avila-Reese, C. Firmani, C. Frenk, & C. Allen, Rev.Mex. Astron. Astrophys. Conf. Ser., 17, 91

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A synthetic spectral library for stars in the temperature range between 4,000 and 50,000 K is presented. Model grid covers the wavelength interval from 912 to 7000 Å at inverse resolution R = 50,000 (in the 912 to 4500 Å interval) and R = 500,000 otherwise. Calculations relied on the Kurucz original code ATLAS. The model grid spans metallicity from [M/H] = -2.0 to +0.5 and log g from 0.0 to 5.0 dex. This is currently the most extended theoretical library available in the literature at such high resolution.

 

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).

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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.

 

Buzzoni, A.:
"Ultraviolet properties of primeval galaxies: theoretical models from stellar population synthesis", 2002, Astron. Journal, 123, 1188.

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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.

 

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

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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.

 

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.

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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.

 

Massarotti, M., Iovino, A., Buzzoni, A., Valls-Gabaud, D.:
"New insights on the accuracy of photometric redshift measurements", 2001, Astron. Astrophys., 380, 425.

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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.

 

Massarotti, M., Iovino, A., Buzzoni, A.:
"Dust absorption and the cosmic ultraviolet flux density", 2001, Astrophys. Journal, 559, L105

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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.

 

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.

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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.

 

Massarotti, M., Iovino, A., Buzzoni, A.:
"A critical appraisal of the SED fitting method to estimate photometric redshifts", 2001, Astron. Astrophys., 368, 74.

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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.

 

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

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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.

 

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

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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).
 

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.

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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.

 

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.

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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.

 

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.

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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.

 

Buzzoni, A.:
"Statistical properties of stellar populations and surface-brightness fluctuations in galaxies", 1993, Astron. Astrophys., 275, 433.

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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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