A new stellar library in the region of the CO index at 2.3 μm. New index definition and empirical fitting functions

Bibcode
2008A&A...489..885M
DOI
10.1051/0004-6361:200810044
Mármol-Queraltó, E.; Cardiel, N.; Cenarro, A. J.; Vazdekis, A.; Gorgas, J.; Pedraz, S.; Peletier, R. F.; Sánchez-Blázquez, P.
Referencia bibliográfica

Astronomy and Astrophysics, Volume 489, Issue 2, 2008, pp.885-909

Fecha de publicación:
10
2008
Revista
Astronomy and Astrophysics
Número de autores
8
Número de autores del IAC
2
Número de citas
47
Número de citas referidas
40
Descripción
Context: The analysis of unresolved stellar populations demands evolutionary synthesis models with realistic physical ingredients and extended wavelength coverage. Aims: We quantitatively describe the first CO bandhead at 2.3 μm to allow stellar population models to provide improved predictions in this wavelength range. Methods: We observed a new stellar library with a better coverage of the stellar atmospheric parameter space than in earlier works. We performed a detailed analysis of the robustness of previous CO index definitions with spectral resolution, wavelength calibration, signal-to-noise ratio, and flux calibration. Results: We define a new line-strength index for the first CO bandhead at 2.3 μm, D_CO, better suited for stellar population studies than previous index definitions. We derive empirical fitting functions for the CO feature as a function of the stellar parameters (T_eff, log g and [Fe/H]), showing a detailed quantitative metallicity dependence.
Proyectos relacionados
Miembros del grupo
Huellas de la Formación de las Galaxias: Poblaciones estelares, Dinámica y Morfología

Bienvenida a la página web del g rupo de investigación Traces of Galaxy Formation. Somos un grupo de investigación amplio, diverso y muy activo cuyo objetivo principal es entender la formación de galaxias en el Universo de una manera lo más completa posible. Con el estudio detellado de las poblaciones estelares como bandera, estamos constantemente

Ignacio
Martín Navarro
En ejecución
Tipo
Con árbitro
Galaxias

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