Selection of Metal‐poor Giant Stars Using the Sloan Digital Sky Survey Photometric System
Open accessAbstract
We present a method for the photometric selection of metal-poor halo giants from the imaging data of the Sloan Digital Sky Survey (SDSS). These stars are offset from the stellar locus in the g-r versus u-g color-color diagram. Based on a sample of 29 candidates for which spectra were taken, we derive a selection efficiency of the order of 50% for stars brighter than r ~ 17 mag. The candidates selected in 400 deg 2 of sky from the SDSS Early Data Release trace the known halo structures (tidal streams from the Sagittarius dwarf galaxy and the Draco dwarf spheroidal galaxy), indicating that such a color-selected sample can be used to study the halo structure even without spectroscopic information. This method, and supplemental techniques for selecting halo stars, such as RR Lyrae stars and other blue horizontal-branch stars, can produce an unprecedented three-dimensional map of the Galactic halo based on the SDSS imaging survey.
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Mapping the Galaxy requires large-area coverage, excellent image quality to maximize photometric and astrometric accuracy, photometric precision of at least 1%, and systematic astrometric errors not exceeding about 10 mas per observation.
“Mapping the Galaxy requires large-area coverage; excellent image quality to maximize photometric and astrometric accuracy, especially in crowded fi elds; photometric precision of at least 1% to separate main-sequence and giant stars ( e.g., Helmi et al. 2003 ) , as well as to identify variable stars such as RR Lyrae ( Sesar et al. 2010; Sharma et al. 2011 ) ; and systematic astrometric errors not”
From LSST: From Science Drivers to Reference Design and Anticipated Data Products (2019) · cites this paper as Helmi et al. 2003
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References 38 · Cited by 57
Research works printed but not linked: 3
- Helmi, A., White, S. D. M., & Springel, V. 2003, MNRAS, in press (astro-ph/0208041) · arXiv
- Lupton, R. H., et al. 2001, in ASP Conf. Proc. 238, Astronomical Data Analysis Software and Systems X, ed. F. R. Harnden, Jr., F. A. Primini, & H. E. Payne (San Francisco: ASP), 269
- Pier, J. R., et al. 2003, AJ, in press
- Authors
- Helmi, A., Ivezić, Ž., Prada, F., Pentericci, L., Rockosi, C. M., Schneider, D. P., Grebel, E. K., Harbeck, D., Lupton, R. H., Gunn, J. E., Knapp, G. R., Strauss, M. A., & Brinkmann, J.
- Affiliations
- Max Planck Society (DE)
- Princeton University (US)
- Calar Alto Observatory (ES)
- Max Planck Institute for Astronomy (DE)
- University of Washington (US)
- Pennsylvania State University (US)
- ORCID
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2003-03-20
- Volume
- 586
- Issue
- 1
- Pages
- 195-200
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2098596302
- Cited by
- 57
- References
- 38
- Citations by year
- 2025: 1 · 2022: 2 · 2020: 2 · 2019: 2 · 2018: 6 · 2017: 2 · 2016: 4 · 2014: 3 · 2012: 3
- FWCI
- 1.93
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
- Max Planck Institute for Plasma Physics (submittedVersion)
- Max Planck Digital Library (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation (9900703)
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Alfred P. Sloan Foundation
- Princeton University
- University of Washington
- Johns Hopkins University
- New Mexico State University
- Max-Planck-Gesellschaft
- Max-Planck-Institut für Astronomie
- U.S. Naval Observatory
- Fermilab
- Los Alamos National Laboratory
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Keywords
- Galactic halo, photometric selection, color-color diagrams, Sagittarius dwarf galaxy, Draco dwarf spheroidal galaxy, tidal currents
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