Bibcode
Cenarro, A. J.; Cardiel, N.; Vazdekis, A.; Gorgas, J.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 396, Issue 4, pp. 1895-1914.
Advertised on:
7
2009
Número de citas
21
Número de citas referidas
20
Descripción
Using the near-infrared spectral stellar library of Cenarro et al., the
behaviour of the MgI line at 8807 Å and nearby TiO bands is
analyzed in terms of the effective temperature, surface gravity and
metallicity of the library stars. New spectroscopic indices for both
spectral features - namely MgI and sTiO - are defined, and their
sensitivities to different signal-to-noise ratios, spectral resolutions,
flux calibrations and sky emission-line residuals are characterized. The
two new indices exhibit interesting properties. In particular, MgI is a
good indicator of the Mg abundance, whereas sTiO is a powerful
dwarf-to-giant discriminator for cold spectral types. Empirical fitting
polynomials that reproduce the strength of the new indices as a function
of the stellar atmospheric parameters are computed, and a FORTRAN
routine with the fitting function predictions is made available. A
thorough study of several error sources, non-solar [Mg/Fe] ratios and
their influence on the fitting function residuals is also presented.
From this analysis, an [Mg/Fe] underabundance of ~ -0.04 is derived for
the Galactic open cluster M67.
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