期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 490, 期 2, 页码 2241-2253出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz2643
关键词
stars: abundances; Galaxy: evolution; Galaxy: formation; Local Group; dark ages, reionization, first stars; early Universe
资金
- Leverhulme Trust
- Spanish Ministry of Economy and Competitiveness (MINECO)
- Severo-Ochoa Ph.D. fellowship, within the Severo-Ochoa International
- Spanish ministry project [MINECOAYA2017-86389-P]
- Spanish Ministry of Science, Innovation and Universities (MICIU)
- Ramon y Cajal program MICIU [RYC-2013-14875]
- Spanish ministry project MICIU [AYA2017-86389-P]
- Emmy Noether program from the Deutsche Forschungsgemeinschaft (DFG)
- IdEx Unistra
- NFM, RI, NL
- EC
- French National Research Agency (ANR) [ANR-18-CE31-0017]
- CNRS/INSU through the Programme National Galaxies et Cosmologie
- CNRS [PICS07708]
- International Space Science Institute (ISSI) in Bern
- Agence National de la Recherche (ANR) [183787]
- Swiss National Science Foundation [PZ00P2_168065]
- ESO Telescopes at the La Silla Paranal Observatory [097.B-0764(A), 0102]
- INT telescopes at the Observatorio Roque de los Muchachos [C71, C54, C75, C123, C175]
- Swiss National Science Foundation (SNF) [PZ00P2_168065] Funding Source: Swiss National Science Foundation (SNF)
- STFC [ST/P00556X/1, ST/M002047/1, ST/L005077/1] Funding Source: UKRI
We present the results of a 3-yr long, medium-resolution spectroscopic campaign aimed at identifying very metal -poor stars from candidates selected with the CaHK, metallicitysensitive 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 per cent with [Fe/H] < -3 and 24 per cent with -3 < [Fe/H] < -2) for which a carbon determination is possible, contingent mainly on the carbon abundance, effective temperature and signal-to-noise ratio of the stellar spectra. We find an average carbon enhancement fraction ([C/Fe] >= +0.7) of 41 +/- 4 per cent for stars with -3 < [Fe/H] < -2 and 58 +/- 14 per cent for stars with [Fe/H] < -3, and report updated success rates for the Pristine survey of 56 per cent and 23 per cent to recover stars with [Fe/H] < -2.5 and < -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 William Herschel Telescope Enhanced Area Velocity Explorer.
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