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Paper: The Pistol Star and Unstable Massive Stars at the Galactic Center
Volume: 332, The Fate of the Most Massive Stars
Page: 58
Authors: Najarro, F.
Abstract: We present recent results on quantitative spectroscopic studies of the Pistol Star and other massive stars in the Quintuplet and Arches clusters. Thanks to the impressive evolution of IR detectors and the new generation of line blanketed models for the extended atmospheres of hot stars we are able to accurately derive the physical properties of the massive stars in these clusters. Our analysis of the LBVs in the Quintuplet cluster provides, for the first time, a direct estimate of ff-elements and Fe chemical abundances in these objects. Preliminary results point to a slightly enhanced enrichment of ff-elements compared to Fe and suggest an initial mass function dominated by massive stars, as found for the Arches cluster. On the other hand, from our analysis of the Arches cluster, we introduce a new method to estimate metallicity in very young clusters based on the N abundance of WNL stars and the theory of evolution of massive stars. Results indicating solar metallicity are presented.
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