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The kinematics and chemistry of the Sagittarius streams

Published online by Cambridge University Press:  26 February 2013

Weibin Shi ,
Yuqin Chen ,
Kenneth Carrell  and
Gang Zhao
Weibin Shi
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: [email protected] Shandong Provincial Key Laboratory of Optical Astronomy and the Solar–Terrestrial Environment, School of Space Science and Physics, Shandong University at Weihai, Weihai 264209, China
Yuqin Chen
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: [email protected]
Kenneth Carrell
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: [email protected]
Gang Zhao
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: [email protected] Shandong Provincial Key Laboratory of Optical Astronomy and the Solar–Terrestrial Environment, School of Space Science and Physics, Shandong University at Weihai, Weihai 264209, China
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Abstract

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We selected red horizontal-branch stars along the streams of the Sagittarius dwarf galaxy (Sgr) from sdss DR7 spectroscopic data using a theoretical model. We investigate the metallicity distribution of stars in the Sgr streams. The metallicity gradient is (−1.8 ± 0.3) × 10⊃3 dex deg−1 in the first wrap of the trailing arm and (−1.5 ± 0.4) × 10−3 dex deg−1 in the first wrap of the leading arm.

Keywords

Galaxy: halostars: horizontal-branch
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 422 - 424
Copyright
Copyright © International Astronomical Union 2013

References

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Law, D. & Majewski, S. 2010, ApJ, 714, 229CrossRefGoogle Scholar
Zhao, G., Chen, Y. Q., Shi, J. R., et al. 2006, ChJAA, 6, 265Google Scholar