Bibcode
Asa'd, R. S.; Vazdekis, A.; Zeinelabdin, Sami
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 457, Issue 2, p.2151-2163
Fecha de publicación:
4
2016
Número de citas
15
Número de citas referidas
12
Descripción
We use ASAD2, the new version of ASAD (Analyzer of Spectra
for Age Determination), to obtain the age and reddening of 27 Large
Magellanic Cloud (LMC) clusters from full fitting of integrated spectra
using different statistical methods [χ2 and
Kolmogorov-Smirnov (KS) test] and a set of stellar population models
including GALAXEV and MILES. We show that our results are in good
agreement with the colour-magnitude diagram (CMD) ages for both models,
and that metallicity does not affect the age determination for the full
spectrum fitting method regardless of the model used for ages with log
(age/year) < 9. We discuss the results obtained by the two
statistical results for both GALAXEV and MILES versus three factors:
age, signal-to-noise ratio and resolution (full width at half maximum).
The predicted reddening values when using the χ2
minimization method are within the range found in the literature for
resolved clusters (i.e. <0.35); however the KS test can predict E(B -
V) higher values. The sharp spectrum transition originated at ages
around the supergiants contribution, at either side of the AGB peak
around log (age/year) 9.0 and log (age/year) 7.8 are limiting our
ability to provide values in agreement with the CMD estimates and as a
result the reddening determination is not accurate. We provide the
detailed results of four clusters spanning a wide range of ages.
ASAD2 is a user-friendly program available for download on
the Web and can be immediately used at
http://randaasad.wordpress.com/asad-package/.