GTC Follow-up Observations of Very Metal-poor Star Candidates from DESI

Allende Prieto, Carlos; Aguado, David S.; González Hernández, Jonay I.; Rebolo, Rafael; Najita, Joan; Manser, Christopher J.; Rockosi, Constance; Slepian, Zachary; Mezcua, Mar; Valluri, Monica; Ezzeddine, Rana; Koposov, Sergey E.; Cooper, Andrew P.; Dey, Arjun; Gänsicke, Boris T.; Li, Ting S.; Cunha, Katia; Zou, Siwei; Aguilar, Jessica Nicole; Ahlen, Steven; Brooks, David; Claybaugh, Todd; Cole, Shaun; Eftekharzadeh, Sarah; Fanning, Kevin; Forero-Romero, Jaime; Gontcho a Gontcho, Satya; Honscheid, Klaus; Jablonka, Pascale; Kehoe, Robert; Kisner, Theodore; Landriau, Martin; de la Macorra, Axel; Meisner, Aaron; Miquel, Ramón; Moustakas, John; Nie, Jundan; Poppett, Claire; Prada, Francisco; Rezaie, Mehdi; Rossi, Graziano; Sánchez, Eusebio; Schubnell, Michael; Sharples, Ray; Siudek, Malgorzata; Smith, Verne V.; Tarlé, Gregory; Vincenzo, Fiorenzo; Weaver, Benjamin Alan; Zhou, Zhimin; Zou, Hu
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The Astrophysical Journal

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The observations from the Dark Energy Spectroscopic Instrument (DESI) will significantly increase the numbers of known extremely metal-poor stars by a factor of ~10, improving the sample statistics to study the early chemical evolution of the Milky Way and the nature of the first stars. In this paper we report follow-up observations with high signal-to-noise ratio of nine metal-poor stars identified during the DESI commissioning with the Optical System for Imaging and Low-Resolution Integrated Spectroscopy (OSIRIS) instrument on the 10.4 m Gran Telescopio Canarias. The analysis of the data using a well-vetted methodology confirms the quality of the DESI spectra and the performance of the pipelines developed for the data reduction and analysis of DESI data.
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