The Pristine survey VI. The first three years of medium-resolution follow-up spectroscopy of Pristine EMP star candidates

Autor: Carmela Lardo, K. Youakim, Nicolas F. Martin, Rafael Garcia-Dias, Thomas G. Wilson, Luis Peralta de Arriba, Julio F. Navarro, Vanessa Hill, Pascale Jablonca, Pedro A. Palicio, Georges Kordopatis, Nicholas J. Fantin, Federico Sestito, Carlos Allende Prieto, Else Starkenburg, R. Lucchesi, Jonay I. González Hernández, Yeisson Osorio, Farbod Jahandar, Kim A. Venn, Rubén Sánchez-Janssen, David Aguado, Nicolas Longeard, Anke Arentsen, Collin Kielty, Elisabetta Caffau, Guillaume F. Thomas, Patrick Côté, Eline Tolstoy, Piercarlo Bonifacio
Přispěvatelé: Institute of Astronomy, University of Cambridge, Universidad de La Laguna [Tenerife - SP] (ULL), Leibniz Institute for Astrophysics Potsdam (AIP), Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Cosmological Impact of the First Stars (CIFIST), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Peralta de Arriba, Luis [0000-0002-3084-084X], Apollo - University of Cambridge Repository, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Astronomy, Aguado D.S., Youakim K., Gonzalez Hernandez J.I., Prieto C.A., Starkenburg E., Martin N., Bonifacio P., Arentsen A., Caffau E., de Arriba L.P., Sestito F., Garcia-Dias R., Fantin N., Hill V., Jablonca P., Jahandar F., Kielty C., Longeard N., Lucchesi R., Sanchez-Janssen R., Osorio Y., Palicio P.A., Tolstoy E., Wilson T.G., Cote P., Kordopatis G., Lardo C., Navarro J.F., Thomas G.F., Venn K.
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2019, 490 (2), pp.2241-2253. ⟨10.1093/mnras/stz2643⟩
Monthly Notices of the Royal Astronomical Society, 490(2), 2241-2253. Oxford University Press
ISSN: 0035-8711
1365-2966
Popis: We present the results of a 3-year long, medium-resolution spectroscopic campaign aimed at identifying very metal-poor stars from candidates selected with the CaHK, metallicity-sensitive Pristine survey. The catalogue consists of a total of 1007 stars, and includes 146 rediscoveries of metal-poor stars already presented in previous surveys, 707 new very metal-poor stars with [Fe/H] < -2.0, and 95 new extremely metal-poor stars with [Fe/H] < -3.0. We provide a spectroscopic [Fe/H] for every star in the catalogue, and [C/Fe] measurements for a subset of the stars (10% with [Fe/H] < -3 and 24% with -3 < [Fe/H] < -2) for which a carbon determination is possible, contingent mainly on the carbon abundance, effective temperature and S/N of the stellar spectra. We find an average carbon enhancement fraction ([C/Fe] >= +0.7) of 41 +- 4% for stars with -3 < [Fe/H] < -2 and 58 +- 14% for stars with [Fe/H] < -3, and report updated success rates for the Pristine survey of 56 % and 23 % to recover stars with [Fe/H] < -2.5 and [Fe/H] < -3, respectively. Finally, we discuss the current status of the survey and its preparation for providing targets to upcoming multi-object spectroscopic surveys such as WEAVE.
13 pages 6 figures, accepted for publication in MNRAS
Databáze: OpenAIRE
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