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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
ULySS: A full spectrum fitting package
Astronomy and Astrophysics, Volume 501, No. 3, Year 2009
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Description
Aims. We provide an easy-to-use full-spectrum fitting package and explore its applications to (i) the determination of the stellar atmospheric parameters and (ii) the study of the history of stellar populations. Methods. We developed ULySS, a package to fit spectroscopic observations against a linear combination of non-linear model components convolved with a parametric line-of-sight velocity distribution. The minimization can be either local or global, and determines all the parameters in a single fit. We use χ 2 maps, convergence maps and Monte-Carlo simulations to study the degeneracies, local minima and to estimate the errors. Results. We show the importance of determining the shape of the continuum simultaneously to the other parameters by including a multiplicative polynomial in the model (without prior pseudo-continuum determination, or rectification of the spectrum). We also stress the usefulness of using an accurate line-spread function, depending on the wavelength, so that the line-shape of the models properly matches the observation. For simple models, i.e., to measure the atmospheric parameters or the age/metallicity of a single-age stellar population, there is often a unique minimum, or when local minima exist they can be recognized unambiguously. For more complex models, Monte-Carlo simulations are required to assess the validity of the solution. Conclusions. The ULySS package is public, simple to use and flexible. The full spectrum fitting makes optimal use of the signal. © 2009 ESO.
Authors & Co-Authors
Koleva, M.
France, Lyon
Université de Lyon
France, Villeurbanne
Université Claude Bernard Lyon 1
France, Saint-genis-laval
Centre de Recherche Astrophysique de Lyon
France, Lyon
École Normale Supérieure de Lyon
Bulgaria, Sofia
Sofia University St. Kliment Ohridski
Prugniel, P.
France, Lyon
Université de Lyon
Bouchard, Antoine
France, Lyon
Université de Lyon
South Africa, Cape Town
University of Cape Town
Wu, Y.
France, Lyon
Université de Lyon
China, Beijing
National Astronomical Observatories Chinese Academy of Sciences
Statistics
Citations: 340
Authors: 4
Affiliations: 7
Identifiers
Doi:
10.1051/0004-6361/200811467
ISSN:
00046361
e-ISSN:
14320746
Study Design
Cross Sectional Study