Welcome to Journal of University of Chinese Academy of Sciences,Today is

›› 2016, Vol. 33 ›› Issue (2): 150-154.DOI: 10.7523/j.issn.2095-6134.2016.02.002

• Research Articles • Previous Articles     Next Articles

Photometric metallicity calibration based on SCUSS and metallicity estimates of Sagittarius stream in south Galactic cap

GU Jiayin, DU Cuihua   

  1. School of Physics, University of Chinese Academy of Sciences, Beijing 101408, China
  • Received:2015-05-11 Revised:2015-05-27 Online:2016-03-15

Abstract:

Based on SDSS g,SDSS r,and SCUSS u photometry, we develop a photometric calibration for estimating the stellar metallicity from u-g and g-r colors by using the spectra of F- and G-type main-sequence stars. The rms scatter of the photometric metallicity residuals relative to spectrum-based metallicity is 0.14 dex when g-r<0.4, and 0.16 dex when g-r>0.4. Due to the deeper and more accurate magnitude of SCUSS u, we set the application of photometric metallicity estimation in the range of g<21. We select the Sagittarius (Sgr) stream stars in south Galactic cap to study metallicity distribution. We find that the Sgr stream at the cylindrical Galactocentric coordinates of R~19 kpc and |Z|~14 kpc exhibits a more metal-rich distribution than the halo.

Key words: metallicity, substructure, stellar content

CLC Number: