2009A&A...501.1269K


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.15CET03:48:42

2009A&A...501.1269K - Astronomy and Astrophysics, volume 501, 1269-1279 (2009/7-3)

ULySS: a full spectrum fitting package.

KOLEVA M., PRUGNIEL P., BOUCHARD A. and WU Y.

Abstract (from CDS):

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. 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 χ2 maps, convergence maps and Monte-Carlo simulations to study the degeneracies, local minima and to estimate the errors. 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. The ULySS package is public, simple to use and flexible. The full spectrum fitting makes optimal use of the signal.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - methods: data analysis - galaxies: stellar content - stars: fundamental parameters

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 110 GiG 00 40 22.0544552438 +41 41 07.496294862   8.92 8.07     ~ 1186 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10616 1
3 HD 10780 BY* 01 47 44.8336250528 +63 51 09.007331430 6.84 6.44 5.63 4.99 4.60 K0V 310 0
4 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 634 1
5 V* TV Gem s*r 06 11 51.4146886962 +21 52 05.662130069 10.58 8.81 6.56 4.65 3.17 M0-M1.5Iab 160 0
6 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1991 0
7 HD 76151 PM* 08 54 17.9469808897 -05 26 04.046487788 6.89 6.67 6.00     G2V 463 0
8 * 53 Vir PM* 13 12 03.5439044831 -16 11 54.977342934   5.50 5.04     F5.5V 124 0
9 * gam Sge PM* 19 58 45.4286265 +19 29 31.728079 6.97 5.04 3.47 2.27 1.35 M0-III 239 0
10 * 42 Cyg pA* 20 29 20.3899981108 +36 27 17.011345364   6.291 5.899     A2Iab-Ib 78 0

    Equat.    Gal    SGal    Ecl

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2019.12.15-03:48:42

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