Metallicities of Pristine stars : J/MNRAS/472/2963


Authors : Youakim K. orcid , Starkenburg E., Aguado D.S. (hide) , Starkenburg E., Aguado D.S. et..al

Bibcode : 2017MNRAS.472.2963Y (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Stars, metal-deficient; Abundances, [Fe/H]; Photometry, SDSS
UAT : Chemically peculiar stars, Metallicity, Optical astronomy, Sloan photometry

Observation (OC)

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Inserted into VizieR : 11-Aug-2020
Last modification : 17-Aug-2024

The Pristine survey. III. Spectroscopic confirmation of an efficient search for extremely metal-poor stars. (2017)

Keywords : stars abundances - Galaxy: evolution - Galaxy: formation - Local Group - dark ages, reionization, first stars - early Universe

Abstract:The Pristine survey is a narrow-band, photometric survey focused around the wavelength region of the CaII H&K absorption lines, designed to efficiently search for extremely metal-poor stars. In this work, we use the first results of a medium-resolution spectroscopic follow-up to refine the selection criteria for finding extremely metal-poor stars ([Fe/H]<=-3.0) in the Pristine survey. We consider methods by which stars can be selected from available broad-band and infrared photometry plus the additional Pristine narrow-band photometry. The sample consists of 205 stars in the magnitude range 14<V<18. Applying the photometric selection criteria cuts the sample down to 149 stars, and from these we report a success rate of 70 per ...(more)
Abstract: (hide)
In conjunction with the photometric component of Pristine, a spectroscopic follow-up programme has been observing the most promising, bright (V<18) metal-poor candidates on 2-4m class telescopes with medium- and high-resolution spectrographs. In this paper, we focus on the homogeneous follow-up sample of 205 candidate stars observed with the Intermediate Dispersion Spectrograph (IDS) on the 2.5m Isaac Newton Telescope (INT) over the period of 2016 March 18-27, May 15-23, July 20-24 and September 2-6, and with the Intermediate dispersion Spectrograph and Imaging System (ISIS) on the 4.2m William Herschel Telescope (WHT) over the period of 2016 May 1-2 and July 29-31 (Programs C71 and N5). Both telescopes are located at the Roque de Los Muchachos Observatory in La Palma, Canary Islands.

  • J/AN/338/686 : Pristine survey II. Bright stars abundances (Caffau+, 2017)

                
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