Searches for the most metal-poor candidates from SDSS and SEGUE

Timothy C. Beers, Daniela Carollo

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

3 Citations (Scopus)


We report on efforts to identify large samples of very and extremely metal-poor stars based on medium-resolution spectroscopy and ugriz photometry obtained during the course of the Sloan Digital Sky Survey (SDSS), and its extension, SDSS-II, which includes the program SEGUE: Sloan Extension for Galactic Understanding and Exploration. To date, over 8000 stars with [Fe/H]≤-2.0 and effective temperatures in the range 4500K<T eff<7000K have been found, with the expected numbers in this temperature range to be well over 10,000 once SEGUE is completed. The numbers roughly double when one includes warmer blue stragglers and Blue Horizontal-Branch (BHB) stars in these counts. We show the observed low-metallicity tails of the Metallicity Distribution Functions for the cooler SDSS/SEGUE stars obtained thus far. We also comment on the confirmation of an inner/outer halo dichotomy in the Milky Way, and on how this realization may be used to direct searches for even more metal-poor stars in the near future.

Original languageEnglish
Title of host publicationFirst Stars III
EditorsBrian W. O-Shea, Alexander Heger, Tom Abel
Number of pages5
Publication statusPublished - 2008
EventFirst Stars III - Santa Fe, NM, United States
Duration: 15 Jul 200720 Jul 2007


OtherFirst Stars III
CountryUnited States
CitySanta Fe, NM


  • Galactic halo
  • Metal-poor stars
  • Milky Way
  • Wide-angle spectroscopic surveys

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