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中国科学院大学学报 ›› 2016, Vol. 33 ›› Issue (2): 150-154.DOI: 10.7523/j.issn.2095-6134.2016.02.002

• 数学与物理学 • 上一篇    下一篇

SCUSS测光金属丰度定标及南银冠人马座星流的金属丰度估计

顾加银, 杜翠花   

  1. 中国科学院大学物理学院, 北京 101408
  • 收稿日期:2015-05-11 修回日期:2015-05-27 发布日期:2016-03-15
  • 通讯作者: 杜翠花
  • 基金资助:

    国家自然科学基金委员会-中国科学院天文联合基金(U1231113)资助

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 Published:2016-03-15

摘要:

基于SDSS g,SDSS r和SCUSS u测光数据,利用F/G型主序星的光谱,从u-gg-r色指数中进行测光金属丰度定标.定标过程中,当g-r<0.4时,测光金属丰度与基于光谱的金属丰度之间的方均根误差为0.14,当g-r>0.4时为0.16.由于SCUSS u更深更精确的星等,能够将测光金属丰度估计的应用范围设置在g<21内.选择南银冠人马座星流来研究金属丰度分布,发现大约在以银心为中心的柱坐标R~19 kpc和|Z|~14 kpc处的人马座星流呈现出比背景晕星更富的金属丰度分布.

关键词: 金属丰度, 子结构, 恒星成分

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

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