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VLT spectrosocpy of RR Lyrae stars in the Sagittarius northern tidal stream

  • S. Duffau (a1), M. T. Ruiz (a1), R. Zinn (a2) and A. K. Vivas (a3)

Abstract

We present VLT spectroscopy of 13 RR Lyrae variables from the QUEST survey that lie in the leading arm of the tidal stream from Sagittarius dSph galaxy. We observed these stars to measure their radial velocities and metal abundances and to complete a sample of stars from the overdensity detected by QUEST in this area of the sky. The full sample contains 42 stars, 29 observed with VLT and 13 observed with GEMINI, we report here the results from the VLT observations so far. We conclude that the new stars and stars reported before by Vivas, Zinn and Gallart (2005) are consistent with belonging to Sgr. We discuss the importance of the final third of the sample, the GEMINI targets, which will provide important constrains on models of the Sgr streams that assume different dark matter halo shapes.

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References

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Vivas, A. K., Zinn, R. & Gallart, C. 2005, Astrophysical Journal 129, 189
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Keywords

VLT spectrosocpy of RR Lyrae stars in the Sagittarius northern tidal stream

  • S. Duffau (a1), M. T. Ruiz (a1), R. Zinn (a2) and A. K. Vivas (a3)

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