Chemical composition of giants from two moving groups

Abstract

We present stellar parameters of 19 K-type giants and their abundances of 13 chemical elements (Al, Ba, Ca, Fe, K, Mg, Mn, Na, Ni, Sc, Si, Ti and V), selected from two moving groups, covering the metallicity range of -0.6 < [Fe/H] < 0.2, based on high resolution spectra. Most elemental abundances show similar trends with previous studies except for Al, Na and Ba, which are affected by evolution seriously. The abundance ratios of [Na/Mg] increase smoothly with higher [Mg/H] and [Al/Mg] decrease slightly with increasing [Mg/H]. [Mg/Ba] show distinction between these two moving groups which is mainly induced by chemical evolution and partly by kinematic effects. The inhomogeneous metallicity of each star from the moving groups demonstrate that these stars have different chemical origins before they were kinematically aggregated and favor the dynamical resonant theory.

11 pages, 11 figures, accepted for publication in MNRAS

References in corpus (9)

• Population Synthesis in the Blue IV: Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations
• Elemental abundances in the atmosphere of clump giants
• Origin and evolution of moving groups I. Characterization in the observational kinematic-age-metallicity space
• Chemically Tagging the HR1614 Moving Group
• The BOES spectropolarimeter for Zeeman measurements of stellar magnetic fields
• The Hyades stream: evaporated cluster or intrusion from the inner disk?
• On the age heterogeneity of the Pleiades, Hyades and Sirius moving groups
• Analysis of 26 Barium Stars I. Abundances
• A Catalog of Moving Group Candidates in The Solar Neighborhood