Shells of dust around AGB stars: Effects
on the integrated spectrum
 of Single Stellar Populations

Piovan, L.; Tantalo, R.; Chiosi, C.

doi:10.1051/0004-6361:20030937

Cited by 71 publications

(185 citation statements)

References 71 publications

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“…Although the task is a complicate issue requiring a careful analysis (Piovan et al 2003(Piovan et al , 2006a, for the purposes of the present study, the effect of extinction can be evaluated using the relation proposed long ago by Guiderdoni & Rocca-Volmerange (1987):…”

Section: Extinctionmentioning

confidence: 99%

Formation and evolution of early-type galaxies: spectro-photometry from cosmo-chemo-dynamical simulations

Tantalo

Chinellato²,

Merlin

et al. 2010

A&A

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Context. One of the major challenges in modern astrophysics is to understand the origin and the evolution of galaxies, the bright, massive early type galaxies (ETGs) in particular. There is strong observational evidence that massive ETGs are already in place at redshift z ∼ 2−3 and that they formed most of their stars well before z = 1. Therefore, these galaxies are likely to be good probes of galaxy evolution, star formation and, metal enrichment in the early Universe. Aims. In this context it is very important to set up a diagnostic tool able to combine results from chemo-dynamical N-Body-TSPH (NB-TSPH) simulations of ETGs with those of spectro-photometric population synthesis and evolution so that all key properties of galaxies can be investigated. These go from the integrated spectrum and magnitudes in any photometry, both in the rest-frame and as a function of the redshift, to present-day structural properties. The main goal of this paper is to provide a preliminary validation of the software package before applying it to the analysis of observational data. Methods. The galaxy models in use where calculated by the Padova group in two different cosmological scenarios: the standard cold dark matter cosmology (SCDM), and the so-called Concordance cosmology (ΛCDM, with Ω Λ = 0.762). For these template galaxies, we recover their spectro-photometric evolution through the entire history of the Universe. This is done in particular for two important photometric systems, the Bessell-Brett and the Sloan Digital Sky Survey (SDSS) passbands. Results. We computed magnitudes and colors and their evolution with the redshift along with the evolutionary and cosmological corrections for the model galaxies at our disposal, and compared them with data for ETGs taken from the COSMOS and the GOODS databases. Finally, starting from the dynamical simulations and photometric models at our disposal, we created synthetic images in a given photometric system, from which we derived the structural and morphological parameters. In addition to this, we address the question of the scaling relations, and in particular we examine the one by Kormendy. The theoretical results are compared with observational data of ETGs selected form the SDSS database. Conclusions. The simulated colors for the different cosmological scenarios follow the general trend shown by galaxies of the COSMOS and GOODS surveys at lower redshifts and are in good agreement with the data up to z ∼ 1, where the number of early-type galaxies observed falls abruptly. In conclusion, within the redshift range considered, all the simulated colors reproduce the observational data quite well. Looking at the structural parameters derived from the surface imaging, the luminosities and effective radii (Kormendy relation) measured for our model galaxies are consistent with the archival data from the SDSS.

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Section: Extinctionmentioning

confidence: 99%

Formation and evolution of early-type galaxies: spectro-photometry from cosmo-chemo-dynamical simulations

Tantalo

Chinellato²,

Merlin

et al. 2010

A&A

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“…NO http://pleiadi.pd.astro.it Mouhcine (2002) YES solar scaled comp. YES upon request Piovan et al (2003) NO solar scaled comp. YES upon request Marigo et al (2003a) Y E S O -/C-rich comp.…”

Section: Introductionmentioning

confidence: 99%

Evolution of asymptotic giant branch stars

Marigo¹,

Girardi

Bressan

et al. 2008

A&A

1,581

2,465

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We present a large set of theoretical isochrones, whose distinctive features mostly reside on the greatly-improved treatment of the thermally-pulsing asymptotic giant branch (TP-AGB) phase. Essentially, we have coupled the TP-AGB tracks described in Paper I, at their stages of pre-flash quiescent H-shell burning, with the evolutionary tracks for the previous evolutionary phases from Girardi et al. (2000, A&AS, 141, 371). Theoretical isochrones for any intermediate value of age and metallicity are then derived by interpolation in the grids. We take care that the isochrones keep, to a good level of detail, the several peculiarities present in these TP-AGB trackse.g., the cool tails of C-type stars owing to the use of proper molecular opacities as convective dredge-up occurs along the TP-AGB; the bell-shaped sequences in the Hertzsprung-Russell (HR) diagram for stars with hot-bottom burning; the changes of pulsation mode between fundamental and first overtone; the sudden changes of mean mass-loss rates as the surface chemistry changes from M-to C-type; etc. Theoretical isochrones are then converted to about 20 different photometric systems -including traditional ground-based systems, and those of recent major wide-field surveys such as SDSS, OGLE, DENIS, 2MASS, UKIDSS, etc., − by means of synthetic photometry applied to an updated library of stellar spectra, suitably extended to include C-type stars. Finally, we correct the predicted photometry for the effect of circumstellar dust during the mass-losing stages of the AGB evolution, which allows us to improve the results for the optical-to-infrared systems, and to simulate mid-and far-IR systems such as those of Spitzer and AKARI. We illustrate the most striking properties of these isochrones by means of basic comparisons with observational data for the Milky Way disc and the Magellanic Clouds. Access to the data is provided both via a web repository of static tables (http://stev.oapd.inaf.it/ dustyAGB07 and CDS), and via an interactive web interface (http://stev.oapd.inaf.it/cmd), which provides tables for any intermediate value of age and metallicity, for several photometric systems, and for different choices of dust properties.

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“…In doing so, we could investigate the role of dust in models of population synthesis for intermediate age populations (see, e.g, Piovan et al 2003;Marigo et al 2008, for earlier works on this subject). Paper I was the first attempt, to date, to include fully evolutionary AGB calculations in the predictions of integrated spectra of stellar populations.…”

Section: Introductionmentioning

confidence: 99%

Detailed AGB evolutionary models and near-infrared colours of intermediate-age stellar populations: tests on star clusters

Salaris

Weiß

Cassarà

et al. 2014

A&A

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We investigate the influence of asymptotic giant branch (AGB) stars on integrated colours of star clusters of ages between ∼100 Myr and a few gigayears, and composition typical for the Magellanic Clouds. We use state-of-the-art stellar evolution models that cover the full thermal pulse phase, and take the influence of dusty envelopes on the emerging spectra into account. We present an alternative approach to the usual isochrone method, and compute integrated fluxes and colours using a Monte Carlo technique that enables us to take into account statistical fluctuations due to the typical small number of cluster stars. We demonstrate how the statistical variations in the number of AGB stars and the temperature and luminosity variations during thermal pulses fundamentally limit the accuracy of the comparison (and calibration, for population synthesis models that require a calibration of the AGB contribution to the total luminosity) with star cluster integrated photometries. When compared to observed integrated colours of individual and stacked clusters in the Magellanic Clouds, our predictions match most of the observations well, when statistical fluctuations are taken into account, although there are discrepancies in narrow age ranges with some (but not all) sets of observations.

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Shells of dust around AGB stars: Effects on the integrated spectrum of Single Stellar Populations

Cited by 71 publications

References 71 publications

Formation and evolution of early-type galaxies: spectro-photometry from cosmo-chemo-dynamical simulations

Formation and evolution of early-type galaxies: spectro-photometry from cosmo-chemo-dynamical simulations

Evolution of asymptotic giant branch stars

Detailed AGB evolutionary models and near-infrared colours of intermediate-age stellar populations: tests on star clusters

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