Zinc abundances in Galactic bulge field red giants: Implications for damped Lyman-αsystems
作者： B. Barbuy , A. C. S. Friaça , C. R. da Silveira , V. Hill , M. Zoccali
DOI: 10.1051/0004-6361/201525694
关键词: Bulge 、 Astrophysics 、 Nucleosynthesis 、 Physics 、 Halo 、 Zinc 、 Spectral line 、 Stars 、 Astronomy 、 Metallicity 、 Very Large Telescope
摘要: Zinc in stars is an important reference element because it a proxy to Fe studies of damped Lyman-alpha systems, permitting comparison chemical evolution histories bulge stellar populations and DLAs. In terms nucleosynthesis, behaves as alpha enhanced metal-poor stars. The aim this work derive the iron-peak Zn abundances 56 giants from high resolution spectra. These results are compared with data other samples, well disk halo stars, order better understand these environments. High-resolution spectra were obtained using FLAMES+UVES on Very Large Telescope. We find [Zn/Fe]=+0.24+-0.02 range -1.3 -0.1, shows spread -0.60 < [Zn/Fe] +0.15, most having low [Zn/Fe]<0.0. zinc at metallicity end define decreasing trend increasing metallicities. A DLA systems presented, where dust-depletion correction was applied for both Fe. Finally, we present model enrichment massive spheroids, representing typical classical bulge.
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