Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-13
Astrophys.J. 641 (2006) L117-L120
Astronomy and Astrophysics
Astrophysics
Accepted to ApJL
Scientific paper
10.1086/504106
We report on observations of six giants in the globular cluster M15 (NGC 7078) using the Subaru Telescope to measure neutron-capture elemental abundances. Our abundance analyses based on high-quality blue spectra confirm the star-to-star scatter in the abundances of heavy neutron-capture elements (e.g., Eu), and no significant s-process contribution to them, as was found in previous studies. We have found, for the first time, that there are anti-correlations between the abundance ratios of light to heavy neutron-capture elements ([Y/Eu] and [Zr/Eu]) and heavy ones (e.g., Eu). This indicates that light neutron-capture elements in these stars cannot be explained by only a single r-process. Another process that has significantly contributed to the light neutron-capture elements is required to have occurred in M15. Our results suggest a complicated enrichment history for M15 and its progenitor.
Aoki Wako
Honda Satoshi
Kajino Toshitaka
Mathews Grant J.
Otsuki Kaori
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