Bibcode
de C. Milone, A.; Sansom, A.; Vazdekis, A.; Sánchez-Blázquez, P.; Allende Prieto, C.; Falcón-Barroso, J.
Referencia bibliográfica
International Workshop on Stellar Spectral Libraries ASI Conference Series, 2014, Vol. 11, pp 117-124 Edited by H. P. Singh, P. Prugniel and I. Vauglin
Advertised on:
2014
Número de citas
0
Número de citas referidas
0
Descripción
In order to build more realistic single stellar population (SSP) models
with variable α-enhancement, we have recently determined [Mg/Fe]
in a uniform scale with a precision of about 0.1 dex for 752 stars in
the MILES empirical library. The [α/Fe] abundance ratio is
commonly used as a good temporal scale indicator of star formation,
taking Mg as a template for α elements. Calcium is another element
whose abundance is currently being investigated for the MILES stars. The
MILES library is also being expanded by around 20% by including stars
with known T_eff, log g, [Fe/H] and [Mg/Fe]. The transformation of their
photospheric parameters to the MILES system has been carried out, but
the calibration of their [Mg/Fe] is still in progress. In parallel, C, N
and O abundances are also being compiled from literature for the library
stars because they play an important role in the photospheric opacity,
particularly influencing the blue spectral region. The Galactic
kinematic classification of MILES stars with compiled [Mg/Fe] has been
just computed such that this information can be considered in the SSP
modelling. Comparisons of theoretical stellar predictions of the Lick
line-strength indices against the MILES data have revealed the good
behaviour of Fe-sensitive indices predictions, while highlighting areas
for improvement in some models for the higher order H-Balmer features.