Chemical composition of giants from two moving groups
| Autor: | Liu, F., Chen, Y. Q., Zhao, G., Han, I., Lee, B. C., Kim, K. M., Zhao, Z. S. |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, Volume 422, Issue 4, pages 2969-2979, 2012 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2012.20773.x |
| Popis: | 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. Comment: 11 pages, 11 figures, accepted for publication in MNRAS |
| Databáze: | arXiv |
| Externí odkaz: |
|