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SDSS spectroscopic survey of stars | | Z. Ivezic
; D. Schlegel
; A. Uomoto
; N. Bond
; T. Beers
; C. Allende Prieto
; R. Wilhelm
; Y. Sun Lee
; T. Sivarani
; M. Juric
; R. Lupton
; C. Rockosi
; G. Knapp
; J. Gunn
; B. Yanny
; S. Jester
; S. Kent
; J. Pier
; J. Munn
; G. Richards
; H. Newberg
; M. Blanton
; D. Eisenstein
; S. Hawley
; S. Anderson
; H. Harris
; F. Kiuchi
; A. Chen
; J. Bushong
; H. Sohi
; D. Haggard
; A. Kimball
; J. Barentine
; H. Brewington
; M. Harvanek
; S. Kleinman
; J. Krzesinski
; D. Long
; A. Nitta
; S. Snedden
; SDSS Collaboration
; | | Date: |
17 Jan 2007 | | Journal: | 2006, MmSAI, 77, 1057 | | 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/Zo]~ -1.3. The median metallicity for the low-metallicity [Z/Zo]<-1.3 subsample is nearly independent of Galactic cylindrical coordinates R and z, while it decreases with z for the high-metallicity [Z/Zo]> -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. | | Source: | arXiv, astro-ph/0701509 | | Services: | Forum | Review | PDF | Favorites | |
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