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Title:
SDSS spectroscopic survey of stars.
Authors:
Ivezić, Ž.; Schlegel, D.; Uomoto, A.; Bond, N.; Beers, T.; Allende Prieto, C.; Wilhelm, R.; Lee, Y. Sun; Sivarani, T.; Jurić, 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.; the SDSS Collaboration
Affiliation:
AA(), AB(University of Washington,), AC(Lawrence Berkeley National Laboratory,), AD(Johns Hopkins University,), AE(Princeton University,), AF(Michigan State University (JILA),), AG(University of Texas,), AH(Princeton University,), AI(Princeton University,), AJ(Johns Hopkins University,), AK(Johns Hopkins University,), AL(Texas Tech University), AM(Johns Hopkins University,), AN(Johns Hopkins University,), AO(University of California at Santa Cruz,), AP(University of California at Santa Cruz,), AQ(University of California at Santa Cruz,), AR(Fermi National Accelerator Laboratory,), AS(Fermi National Accelerator Laboratory,), AT(U.S. Naval Observatory,), AU(Drexel University,), AV(Rensselaer Polytechnic Institute,), AW(New York University,), AX(), AY(), AZ(Fermi National Accelerator Laboratory,), BA(), BB(), BC(), BD(), BE(), BF(), BG(University of Arizona,), BH(University of Arizona,), BI(University of Arizona,), BJ(University of Arizona,), BK(University of Arizona,), BL(University of Arizona,), BM(University of Arizona,), BN(University of Arizona,)
Publication:
Memorie della Societa Astronomica Italiana, v.77, p.1057 (2006)
Publication Date:
00/2006
Origin:
MmSAI
Bibliographic Code:
2006MmSAI..77.1057I

Abstract

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_ȯ] ˜ -1.3. The median metallicity for the low-metallicity [Z/Z_ȯ]< -1.3 subsample is nearly independent of Galactic cylindrical coordinates R and z, while it decreases with z for the high-metallicity [Z/Z_ȯ]> -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.
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