KOLEVA, Mina; PRUGNIEL, Philippe; OCVIRK, Pierre; LE BORGNE, Damien; SOUBIRAN, Caroline

doi:10.1111/j.1365-2966.2008.12908.x

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KOLEVA, Mina
Centre de Recherche Astrophysique de Lyon [CRAL]
Sofia University "St. Kliment Ohridski"

PRUGNIEL, Philippe
Centre de Recherche Astrophysique de Lyon [CRAL]
Galaxies, Etoiles, Physique, Instrumentation [GEPI]
Physique des Galaxies et Cosmologie

OCVIRK, Pierre
Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
Astrophysikalisches Institut Potsdam [AIP]

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Monthly Notices of the Royal Astronomical Society. 2008, vol. 385, p. 1998-2010

Oxford University Press (OUP): Policy P - Oxford Open Option A

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Fitting whole spectra at intermediate spectral resolution (R = 1000-3000), to derive physical properties of stellar populations, appears as an optimized alternative to methods based on spectrophotometric indices: it uses all the redundant information contained in the signal. This paper addresses the validation of the method and it investigates the quality of the population models together with the reliability of the fitting procedures. Our method compares observed optical spectra with models to derive the age, metallicity and line broadening due to the internal kinematics. It is insensitive to the shape of the continuum and the results are consistent with Lick indices but three times more precise. We are using two algorithms: STECKMAP, a non-parametric regularized program and NBURSTS a parametric non-linear minimization.< Réduire

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Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting

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