Deep SDSS optical spectroscopy of distant halo stars - I. Atmospheric parameters and stellar metallicity distribution

@article{Prieto2014DeepSO,
  title={Deep SDSS optical spectroscopy of distant halo stars - I. Atmospheric parameters and stellar metallicity distribution},
  author={Carlos Allende Prieto and Emma Fern{\'a}ndez-Alvar and Katharine J. Schlesinger and Y. S. Lee and Heather L. Morrison and Donald P. Schneider and Timothy C. Beers and Dmitry Bizyaev and Garrett L. Ebelke and Elena Malanushenko and Viktor Malanushenko and Daniel J. Oravetz and K. Pan and Audrey Simmons and Jennifer A. Simmerer and Jennifer S. Sobeck and Annie C. Robin},
  journal={Astronomy and Astrophysics},
  year={2014},
  volume={568}
}
Aims. We analyze a sample of tens of thousands of spectra of halo turnoff stars, obtained with the optical spectrographs of the Sloan Digital Sky Survey (SDSS), to characterize the stellar halo population "in situ" out to a distance of a few tens of kpc from the Sun. In this paper we describe the derivation of atmospheric parameters. We also derive the overall stellar metallicity distribution based on F-type stars observed as flux calibrators for the Baryonic Oscillations Spectroscopic Survey… 

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