Astron. Astrophys. 327, 121-124 (1997)

Research Note

Metallicity of the young halo globular cluster Ruprecht 106 ^*

P. François ^{1, 2}, J. Danziger ^{2, 3}, R. Buonanno ⁴ and M.N. Perrin <sup>1

1</sup> Observatoire de Paris, DASGAL, URA 335 du CNRS, 61 Av. de l'Observatoire, F-75014 Paris, France
² ESO Karl Schwarzschild Straße 2, D-85748 Garching bei München, Germany
³ Osservatorio Astronomico di Trieste, Via Tiepolo 11, I-34131 Trieste, Italy
⁴ Osservatorio Astronomico di Roma, Via del Parco Mellini 84, I-00136 Rome, Italy

Received 23 January 1997 / Accepted 9 May 1997

Abstract

Medium resolution spectra of 3 stars have been used to determine the metallicity of the globular cluster Ruprecht 106. On the basis of a code developed by Cayrel et al. (1991), we computed a grid of synthetic spectra in order to derive the metallicity of these stars. We found an abundance of which, although not formally at variance with the estimate of metallicity based on the slope of the RGB ( ) raises some puzzling questions concerning the true metallicity of this cluster.

Key words: globular clusters - Ruprecht 106 - stars: abundances

* Based on observations collected at ESO, La Silla

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations and data reduction
  • 2.1. Atmospheric parameters
• 3. Analysis and results
  • 3.1. The code for spectrum synthesis
  • 3.2. Fitting procedure
  • 3.3. The reference stars
  • 3.4. Metallicity of Ruprecht 106
• 4. Discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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