Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-26
Astrophys.J. 586 (2003) 195
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, 1 table. Accepted by ApJ
Scientific paper
10.1086/367536
We present a method for 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) vs. (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 $r \sim 17^m$. 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, 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.
Brinkmann John
Grebel Eva Katharina
Gunn James E.
Harbeck Daniel
Helmi Amina
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