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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742815.0, MPI für Astronomie / Publikationen_mpia
The Pristine survey II: A sample of bright stars observed with FEROS
Authors:Caffau, E.; Bonifacio, P.; Starkenburg, E.; Martin, N.; Youakim, K.; Henden, A. A.; González Hernández, J. I.; Aguado, D. S.; Prieto, C. A.; Venn, K.; Jablonka, P.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Astronomische Nachrichten
Issue / Number:6
Start Page:686
End Page:695
Audience:Not Specified
Abstract / Description:Extremely metal-poor (EMP) stars are old objects formed in the first Gyr of the Universe. They are rare and, to select them, the most successful strategy has been to build on large and low-resolution spectroscopic surveys. The combination of narrow- and broad band photometry provides a powerful and cheaper alternative to select metal-poor stars. The on-going Pristine Survey is adopting this strategy, conducting photometry with the CFHT MegaCam wide field imager and a narrow-band filter centred at 395.2 nm on the CaII-H and -K lines. In this paper we present the results of the spectroscopic follow-up conducted on a sample of 26 stars at the bright end of the magnitude range of the Survey (g<=15), using FEROS at the MPG/ESO 2.2 m telescope. From our chemical investigation on the sample, we conclude that this magnitude range is too bright to use the SDSS gri bands, which are typically saturated. Instead the Pristine photometry can be usefully combined with the APASS gri photometry to provide reliable metallicity estimates.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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