Publication: High-resolution spectral line indices useful for the analysis of stellar populations
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2020-01-29
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IOP Publishing
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Abstract
The well-known age–metallicity-attenuation degeneracy does not permit unique and good estimates of basic parameters of stars and stellar populations. The effects of dust can be avoided using spectral line indices, but current methods have not been able to break the age–metallicity degeneracy. Here we show that using at least two new spectral line indices defined and measured on high-resolution (R = 6000) spectra of a signal-to-noise ratio (S/N) >/= 10, one gets unambiguous estimates of the age and metallicity of intermediate to old stellar populations. Spectroscopic data retrieved with new astronomical facilities, e.g., X-shooter, MEGARA, and MOSAIC, can be employed to infer the physical parameters of the emitting source by means of spectral line index and index–index diagram analysis.
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© 2020. The American Astronomical Society. We thank the anonymous referee for a quick review of this manuscript. Y.D.M. thanks CONACyT for the research grant CB-A1-S-25070. G.B. acknowledges financial support from the National Autonomous University of Mexico (UNAM) through grant DGAPA/PAPIIT IG100319 and from CONACyT through grant CB2015-252364. P.C. acknowledges support from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq 310041/2018-0). P.C. and G.B. acknowledge support from Fundação de Amparo à Pesquisa do Estado de São Paulo through projects FAPESP 2017/02375-2 and 2018/05392-8. P.C. and S.C. acknowledge support from USP-COFECUB 2018.1.241.1.8-40449 YB. A.G.d.P. acknowledges financial support from the Spanish MCIUN under grant No. RTI2018-096188-B-I00.