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Shortcut to the SSP models |
Selected publications and links to the data: | |
Part II (2009 and earlier) | |
| (see Part I for publications from 2005 to date) | |
Buzzoni, A., Bertone, E., & Chavez, M.:
"Snapshot metallicity estimate of resolved stellar systems through Lick Fe5270 diagnostic", 2009, Astrophysical Journal, 703, L127 |
We outline a new method to derive a "snapshot" metallicity estimate of stellar systems (providing one resolves at
least the brightest part of the CMD) just on the basis of low-resolution (i.e., 6-8 Å FWHM) spectroscopy of a
small stellar sample. Our method relies on the Fe5270 Lick index measurements tracing the ubiquitous component of K-type giants.
This makes the Fe5270 (max) estimate a robust and model-independent tracer of cluster [Fe/H],
being particularly insensitive to the age of the stellar population.
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Buzzoni, A., & Gónzalez-Lópezlira, R.A.:
"AGB Connection and Ultraviolet Luminosity Excess in Elliptical Galaxies", 2008, Astrophys. Journal, 686, 1007 |
Relying on infrared surface brightness fluctuactions to trace AGB properties in a sample of elliptical galaxies in
the Virgo and Fornax clusters, we assess the puzzling origin of the "UV-upturn" phenomenon, recently traced down to
the presence of a hot horizontal branch (HB) stellar component. We find that the UV-upturn actually signals a profound
change in the c-m diagram of stellar populations in elliptical galaxies, involving both the hot stellar component and
red-giant evolution.
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Buzzoni, A., Bertone, E., Chavez, M. & Rodriguez-Merino, L.H.:
"Population synthesis at short wavelengths and spectrophotometric diagnostic tools for galaxy evolution", 2007, an invited contribution to the intl. conference "New quests in stellar astrophysics. II: Ultraviolet properties of evolved stellar populations" (Puerto Vallarta, Mexico, 16-20/Apr/2007), eds. M. Chavez, E. Bertone, L.H. Rodriguez-Merino & D. Rosa-Gonzalez (Springer Verlag: Heidelberg), p.263. |
Taking advantage of recent important advances in the calculation of high-resolution spectral grids of
stellar atmospheres at short-wavelengths, and their implementation for population synthesis models,
we briefly review here some special properties of ultraviolet emission in SSPs, and discuss their
potential applications for identifying and tuning up effective diagnostic tools to probe distinctive
evolutionary properties of early-type galaxies and other evolved stellar systems.
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Buzzoni, A.:
"Late stages of stellar evolution and their impact on spectrophotometric properties of galaxies", 2007, an invited contribution to the intl. conference "From Stars to Galaxies: Building the pieces to build up the Universe" (Venezia, Italy, 16-20/Oct/2006), ASP Conf. Series, no. 374, eds. A. Vallenari, R. Tantalo, L. Portinari and A. Moretti (ASP: San Francisco) p. 311 |
The connection between AGB evolution of stellar populations and infrared vs. ultraviolet properties
of the parent galaxies is reviewed relying on the updated lookout provided by population-synthesis theory.
In particular, planetary-nebula events and hot horizontal-branch evolution are assessed in a unitary view
to outline a plain general picture of galaxy spectrophotometric evolution. This will include a brief
discussion of relevant phenomena such as the "UV upturn" in ellipticals and the stellar mass loss properties
along the galaxy morphological sequence.
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Cellone, S.A., Buzzoni, A.:
"The low-luminosity galaxy population in the NGC 5044 group", 2007, proc. of "Groups of Galaxies in the Nearby Universe", eds. I. Saviane, V. Ivanov and J. Borissova, ESO Astrophys. Symp.,(Springer Verlag: Heidelberg) p. 91 |
Detailed surface photometry for 79 (mostly dwarf) galaxies in the NGC 5044 Group area is analysed,
revealing the existence of different morphologies among objects originally classified as early-type dwarfs.
Particularly, a significant fraction of bright dwarf "ellipticals" show a distinct bulge+disc structure,
pointing to possible "harassed" disc galaxy evolution.
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Buzzoni, A., Arnaboldi, M., Corradi, R.L.M.:
"Planetary nebulae as tracers of galaxy stellar populations", 2006, MNRAS, 368, 877. |
We address the general problem of the luminosity-specific planetary nebula (PN) number, defined as
α = NPN/Lgal, and its relationship with age and metallicity of the parent stellar population.
Our analysis relies on population synthesis models for SSPs and more
elaborated galaxy models along the full star-formation range of the Hubble morphological sequence.
This theoretical framework is compared with the updated census of the PN population in Local Group galaxies
and external ellipticals in the Leo group, and the Virgo and Fornax clusters.
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Buzzoni, A.:
"Photometric entropy of stellar populations and related diagnostic tools", 2005, Proc. of "Resolved Stellar Populations", eds. D. Valls-Gabaud & M. Chavez, ASP Conf. Ser. (ASP: San Francisco), in press. |
A confident assessment of the effective number and luminosity of stellar contributors
in fully or partially unresolved aggregates, like globular clusters and
distant galaxies can provide a very useful interpretative tool to properly assess the observational
bias coming from crowding conditions or surface brightness fluctuations.
These arguments have led us to introduce a new concept of "photometric entropy"
of a stellar population, whose impact on different astrophysical aspects of cluster diagnostic
has been reviewed here.
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Fusi Pecci, F., Bellazzini, M., Buzzoni, A., De Simone, E., Federici, L., Galleti, S.:
"Massive young clusters in the disk of M31", 2005, Astron. Journal, 130, 554. |
We have studied the properties of a sample of 67 very blue and likely young massive clusters in M31, extracted from
the Bologna Revised Catalog of globular clusters. These Blue Luminous Compact Clusters (BLCCs)
are a significant fraction (> 15%) of the whole globular cluster system of M31. Their typical age turns out to be
less than ~2 Gyr, while they probably are not so metal-poor as previously considered. The cluster sample distributes
onto the outskirts of M31, sharing the kinematical properties of the thin, rapidly rotating disc component.
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Buson, L.M., Buzzoni, A., Carraro, G., Bertone, E.:
"EHB stars in the Galactic open cluster NGC 6791: a Rosetta Stone to probe the UV-upturn phenomenon in giant ellipticals", 2006, Baltic Astronomy 15, 49. |
A new set of 13 UV-bright post-HB candidate stars in the field of the Galactic open cluster NGC 6791 have been discovered
from TNG U,B imagery. Owing to its high metal content ([Fe/H]~0.4) and
estimated age (t > 8 Gyr), this cluster represents the nearest ideal aggregate to reproduce the evolved stellar
population giving rise to the UV-upturn phenomenon in Ellipticals and Spiral bulges.
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Buzzoni, A.:
"Broad-band colors and overall photometric properties of template galaxy models from stellar population synthesis", 2005, MNRAS, 361, 725 |
We present here a new set of evolutionary population synthesis models for template galaxies along the Hubble
morphological sequence. The models, that account for the individual evolution of the bulge, disk, and halo components,
provide basic morphological features, along with bolometric luminosity and color evolution (including Johnson/Cousins
"UBVRcIcJHK", Gunn "gri", and Washington "CMT1T2" photometric systems) between 1 and 15 Gyr. Luminosity contribution
from residual gas is also evaluated, both in terms of nebular continuum and Balmer-line enhancement.
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Bertone, E., Chavez, M., Rodriguez-Merino, L., Buzzoni, A.:
"On age and metallicity of evolved stellar populations", 2005, proc. of "Resolved Stellar Populations", ASP Conf. Series., eds. M. Chavez and D. Valls-Gabaud, (ASP: San Francisco) in press. |
We analyze the applicability of updated stellar libraries and synthesis codes in determining the age and chemical
composition of evolved stellar populations from their integrated UV spectra. Here we discuss
the relevant case of two fundamental calibrators, namely the Sun and the galaxy M32.
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Chavez, M., Bertone, E., Rodriguez-Merino, L., Buzzoni, A., Bressan, A.:
"Synthetic mid-UV indices of stars and Simple Stellar Populations", 2005, proc. of "Resolved Stellar Populations", ASP Conf. Series., eds. M. Chavez and D. Valls-Gabaud, (ASP: San Francisco) in press. |
Using the UVBLUE library we have computed all mid-UV spectroscopic indices as defined by Fanelli et al. (1990).
We explore their behaviour in terms of the leading stellar parameters (Teff, log g, [Fe/H]) and also
and quantify the effect of instrumental resolution. We also implemented the UVBLUE grid in two population synthesis
codes (Buzzoni 1989; Bressan et al. 1994), producing a grid of integrated mid-UV spectra for SSPs over a wide
range of age and metallicity.
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Kinman, T.D., Bragaglia, A., Cacciari, A., Buzzoni, A., Spagna, A.:
"The Galactic halo towards the North Galactic Pole", 2005, proc. of "The Three Dimensional Universe with GAIA", ESA SP-576, eds. C. Turon, K.S. O'Flaherty and M.A.C. Perryman (ESA: Paris) p. 175 |
We have used RR Lyrae and Blue HB stars as tracers of the old Galactic halo,
in order to study the halo structure and the galactic rotation as a function
of height above the plane. From the whole sample the motion appears to be significantly more retrograde
than the samples in the solar neighborhood. However, the better statistics has now
revealed the likely existence of two
components, whose characteristics need an accurate analysis of systematic
errors on the proper motions in order to be assessed in detail.
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Cellone, S.A., Buzzoni, A.:
"The low-luminosity galaxy population in the NGC 5044 group", 2005, MNRAS, 356, 41. |
We present multicolour imaging for a sample of 33 dwarf and intermediate-luminosity galaxies in the field of the NGC 5044
Group, complemented with mid-resolution spectroscopy for a subsample of 13 objects. A revised membership and morphological
classification is made for the galaxies in the sample and six new dSph candidates were also found. Kinematical data show
no luminosity segregation for early-type galaxies and a much broader distribution of spirals.
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Solano, E. et al. (with Buzzoni, A.):
"Gaudi: a preparatory archive for the COROT mission", 2005, Astron. Journal, 129, 547. |
The GAUDI database is a preparatory archive for the COROT space mission developed at LAEFF. It contains spectroscopic
and photometric data together with inferred physical parameters for more than 1500 stars gathered since Jan 1998 in 6
years of observational campaign. In this paper, the main functionalities and characteristics of the system are described.
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Buzzoni, A., Bertone, E., Rodriguez-Merino, L., Chavez, M.:
"Beyond the Lick Indices: the High-resolution Spectral Synthesis of Stellar Populations", 2005, proc. of the ESO workshop on "Multiwavelength Mapping of Galaxy Formation and Evolution", eds. R. Bender and A. Renzini, ESO Conf. Series (Springer: Heidelberg) p. 361 |
Up-to-date theoretical SED of stellar populations at 2 Å FWHM resolution is obtained by coupling a new
library of synthetic spectra from the ATLAS and NextGen atmosphere database with the Buzzoni population synthesis
code. We briefly outline the current status of the project, aimed at settling a new theoretical framework of
narrow-band spectrophotometric indices to study stellar populations of galaxies.
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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. |
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.
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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. |
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.
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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 |
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.
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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 |
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.
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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) |
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.
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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 |
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.
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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 |
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.
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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 |
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.
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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 |
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.
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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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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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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.:
"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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AB/Apr 2023 |
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