期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 496, 期 4, 页码 4964-4978出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa1661
关键词
techniques: photometric; techniques: spectroscopic; stars: fundamental parameters; stars: Population II; Galaxy: bulge; Galaxy: stellar content
资金
- Chilean National Telescope Allocation Committee [CN2017B-37, CN2018A-20, CN2018B-46, CN2019A-98, CN2019B-31]
- Emmy Noether program from the Deutsche Forschungsgemeinschaft (DFG)
- French National Research Agency (ANR) funded project 'Pristine' [ANR18-CE31-0017]
- INSU
- CNRS through the Programme National Galaxies et Cosmologie
- CNRS [PICS07708]
- Leverhulme Trust
- Natural Sciences and Engineering Research Council
- Natural Sciences and Engineering Research Council through CREATE training program on New Technologies for Canadian Observatories
- Australian Research Council [DP180101791]
- Spanish Min-istry of Science and Innovation (MICIIN) [MICIIN AYA2017-86389-P]
- Spanish MICIIN under 2013 Ramon y Cajal program [MICIIN RYC-2013-14875]
- Chilean Centro de Excelencia en Astrofisicay Tecnologias Afines (CATA) BASAL grant [AFB-170002]
- Direccion de Investigacion y Desarrollo de la Universidad de La Serena through the Programa de Incentivo a la Investigacion de Academicos (PIA-DIDULS)
- European Union's Horizon 2020 research and innovation programme [730890]
- International Space Science Institute, Bern, Switzerland
- Max Planck Institute for Astronomy, Heidelberg
- Max Planck Institute for Extraterrestrial Physics, Garching
- Johns Hopkins University
- Durham University
- University of Edinburgh
- Queen's University Belfast
- Harvard-Smithsonian Center for Astrophysics
- Las Cumbres Observatory Global Telescope Network Incorporated
- National Central University of Taiwan
- Space Telescope Science Institute
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST-1238877]
- University of Maryland
- Eotvos Lorand University (ELTE)
- Los Alamos National Laboratory
- Gordon and Betty Moore Foundation
- National Aeronautics and Space Administration
- National Science Foundation
Metal-poor stars are important tools for tracing the early history of the Milky Way, and for learning about the first generations of stars. Simulations suggest that the oldest metal-poor stars are to be found in the inner Galaxy. Typical bulge surveys, however, lack low metallicity ([Fe/H] < -1.0) stars because the inner Galaxy is predominantly metal-rich. The aim of the Pristine Inner Galaxy Survey (PIGS) is to study the metal-poor and very metal-poor (VMP, [Fe/H] < -2.0) stars in this region. In PIGS, metal-poor targets for spectroscopic follow-up are selected from metallicity-sensitive CaHK photometry from the CFHT. This work presents the similar to 250 deg(2) photometric survey as well as intermediate-resolution spectroscopic follow-up observations for similar to 8000 stars using AAOmega on the AAT. The spectra are analysed using two independent tools: ULySS with an empirical spectral library, and FERRE with a library of synthetic spectra. The comparison between the two methods enables a robust determination of the stellar parameters and their uncertainties. We present a sample of 1300 VMP stars - the largest sample of VMP stars in the inner Galaxy to date. Additionally, our spectroscopic data set includes similar to 1700 horizontal branch stars, which are useful metal-poor standard candles. We furthermore show that PIGS photometry selects VMP stars with unprecedented efficiency: 86 per cent/80 per cent (lower/higher extinction) of the best candidates satisfy [Fe/H] < -2.0, as do 80 per cent/63 per cent of a larger, less strictly selected sample. We discuss future applications of this unique data set that will further our understanding of the chemical and dynamical evolution of the innermost regions of our Galaxy.
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