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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308721.0, MPI für Astronomie / Publikationen_mpia
SDSS spectroscopic survey of stars
Authors:Ivezic, Z.; Schlegel, D.; Uomoto, A.; Bond, N.; Beers, T.; Allende Prieto, C.; Wilhelm, R.; Lee, Y. S.; Sivarani, T.; Juric, M.; Lupton, R.; Rockosi, C.; Knapp, G.; Gunn, J.; Yanny, B.; Jester, S.; Kent, S.; Pier, J.; Munn, J.; Richards, G.; Newberg, H.; Blanton, M.; Eisenstein, D.; Hawley, S.; Anderson, S.; Harris, H.; Kiuchi, F.; Chen, A.; Bushong, J.; Sohi, H.; Haggard, D.; Kimball, A.; Barentine, J.; Brewington, H.; Harvanek, M.; Kleinman, S.; Krzesinski, J.; Long, D.; Nitta, A.; Snedden, S.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:Memorie della Societa Astronomica Italiana
Start Page:1057
Audience:Not Specified
Abstract / Description:In addition to optical photometry of unprecedented quality, the Sloan Digital Sky Survey (SDSS) is also producing a massive spectroscopic database. We discuss determination of stellar parameters, such as effective temperature, gravity and metallicity from SDSS spectra, describe correlations between kinematics and metallicity, and study their variation as a function of the position in the Galaxy. We show that stellar parameter estimates by Beers et al. show a good correlation with the position of a star in the g-r vs. u-g color-color diagram, thereby demonstrating their robustness as well as a potential for photometric parameter estimation methods. Using Beers et al. parameters, we find that the metallicity distribution of the Milky Way stars at a few kpc from the galactic plane is bimodal with a local minimum at [Z/Z_o] ˜ -1.3. The median metallicity for the low-metallicity [Z/Z_o]< -1.3 subsample is nearly independent of Galactic cylindrical coordinates R and z, while it decreases with z for the high-metallicity [Z/Z_o]> -1.3 sample. We also find that the low-metallicity sample has ˜2.5 times larger velocity dispersion and that it does not rotate (at the ˜10 km/s level), while the rotational velocity of the high-metallicity sample decreases smoothly with the height above the galactic plane.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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