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Astron. Astrophys. 327, 121-124

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Research Note

Metallicity of the young halo globular cluster Ruprecht 106*

P. François1,2, J. Danziger2,3, R. Buonanno4, and M.N. Perrin1

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

Received 23 January 1997 / Accepted 9 May 1997


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 FORMULA which, although not formally at variance with the estimate of metallicity based on the slope of the RGB (FORMULA) 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

© European Southern Observatory (ESO) 1997

Online publication: October 1, 1997
Last change: April 8, 1998