Abundances in Near-Turnoff Stars in the Globular Cluster M 71

✍ Scribed by Jeremy R. King; Ann M. Boesgaard; Constantine P. Deliyannis

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 130 KB
• Volume: 758
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2005.05.053

✦ Synopsis

We have obtained high-resolution, moderate S/N spectroscopy of 5 near-turnoff stars in the intermediate metallicity ([Fe/H]∼ -0.8) globular cluster M 71. These data are used to derive the abundances of 10 elements. For the particular elements examined here, no evidence of star-to-star scatter is seen, and our results, by and large, confirm previous results based on evolved stars in the cluster. A notable exception, however, is that our unremarkable near-solar [Ba/Y] ratio is considerably smaller than that inferred from the cluster giants. Whether this is a signature of post-cluster-formation pollution, surprising in situ processing, or systematic analysis errors is unclear. Additional work on the light-s elements (Rb, Sr, Zr) in our near-turnoff objects might clarify the issue.