Bibcode
Koleva, M.; Vazdekis, A.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 538, id.A143
Advertised on:
2
2012
Revista
Número de citas
90
Número de citas referidas
82
Descripción
Context. The spectral predictions of stellar population models are not
as accurate in the ultra-violet (UV) as in the optical wavelength
domain. One of the reasons is the lack of high-quality stellar
libraries. The New Generation Stellar Library (NGSL), recently released,
represents a significant step towards the improvement of this situation.
Aims: To prepare NGSL for population synthesis, we determined the
atmospheric parameters of its stars, we assessed the precision of the
wavelength calibration and characterised its intrinsic resolution. We
also measured the Galactic extinction for each of the NGSL stars.
Methods: For our analyses we used ULySS, a full spectrum fitting
package, fitting the NGSL spectra against the MILES interpolator.
Results: We find that the wavelength calibration is precise up to 0.1
px, after correcting a systematic effect in the optical range. The
spectral resolution varies from 3 Å in the UV to 10 Å in the
near-infrared (NIR), corresponding to a roughly constant reciprocal
resolution R = λ/δλ ≈ 1000 and an instrumental
velocity dispersion σins ≈ 130 km s-1. We
derived the atmospheric parameters homogeneously. The precision for the
FGK stars is 42 K, 0.24 and 0.09 dex for Teff, log g and
[Fe/H], respectively. The corresponding mean errors are 29 K, 0.50 and
0.48 dex for the M stars, and for the OBA stars they are 4.5 percent,
0.44 and 0.18 dex. The comparison with the literature shows that our
results are not biased.
Table A1 is only available at CDS via anonymous ftp to
cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/538/A143
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