Chemical composition of giants from two moving groups

Details Chemical composition of giants from two moving groups Chemical composition of giants from two moving groups

2012-03-07

arxiv.org/abs/1203.1452v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, 11 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2012.20773.x

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.

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