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High-resolution spectral line indices useful for the analysis of stellar populations



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Rodríguez Merino, Lino H. and Mayya, Y.D. and Coelho, Paula R.T. and Bruzual, Gustavo and Charlot, Stéphane and Carrasco, Esperanza and Gil de Paz, Armando (2020) High-resolution spectral line indices useful for the analysis of stellar populations. Astrophysical journal letters, 889 (2). ISSN 2041-8205

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Official URL: http://dx.doi.org/10.3847/2041-8213/ab6d64


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.

Item Type:Article
Additional Information:

© 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. YB. A.G.d.P. acknowledges financial support from the Spanish MCIUN under grant No. RTI2018-096188-B-I00.

Uncontrolled Keywords:Age; Metallicity; Abundance; Mg
Subjects:Sciences > Physics > Astrophysics
ID Code:60224
Deposited On:30 Apr 2020 11:48
Last Modified:30 Apr 2020 18:28

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