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

Timothy C. Beers; Daniela Carollo

doi:10.1063/1.2905513

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

Timothy C. Beers, Daniela Carollo

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

4 Citations (Scopus)

Abstract

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 language	English
Title of host publication	First Stars III
Editors	Brian W. O-Shea, Alexander Heger, Tom Abel
Pages	104-108
Number of pages	5
Volume	990
DOIs	https://doi.org/10.1063/1.2905513
Publication status	Published - 2008
Event	First Stars III - Santa Fe, NM, United States Duration: 15 Jul 2007 → 20 Jul 2007

Other

Other	First Stars III
Country/Territory	United States
City	Santa Fe, NM
Period	15/07/07 → 20/07/07

Keywords

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

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10.1063/1.2905513

Cite this

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title = "Searches for the most metal-poor candidates from SDSS and SEGUE",

abstract = "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.",

keywords = "Galactic halo, Metal-poor stars, Milky Way, Wide-angle spectroscopic surveys",

author = "Beers, {Timothy C.} and Daniela Carollo",

year = "2008",

doi = "10.1063/1.2905513",

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editor = "O-Shea, {Brian W.} and Alexander Heger and Tom Abel",

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AU - Beers, Timothy C.

AU - Carollo, Daniela

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - Galactic halo

KW - Metal-poor stars

KW - Milky Way

KW - Wide-angle spectroscopic surveys

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U2 - 10.1063/1.2905513

DO - 10.1063/1.2905513

M3 - Conference proceeding contribution

AN - SCOPUS:42449094548

SN - 9780735405097

VL - 990

SP - 104

EP - 108

BT - First Stars III

A2 - O-Shea, Brian W.

A2 - Heger, Alexander

A2 - Abel, Tom

T2 - First Stars III

Y2 - 15 July 2007 through 20 July 2007

ER -

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

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