Exploring the Milky Way stellar disk - A detailed elemental abundance study of 714 F and G dwarf stars in the solar neighbourhood
作者： T. Bensby , S. Feltzing , M. S. Oey
DOI: 10.1051/0004-6361/201322631
关键词:
摘要: Aims. The aim of this paper is to explore and map the age abundance structure stars in nearby Galactic disk. Methods. We have conducted a high-resolution spectroscopic study 714 F G dwarf subgiant Solar neighbourhood. star sample has been kinematically selected trace thin thick disks their extremes, metal-rich stellar halo, sub-structures velocity space such as Hercules stream Arcturus moving group, well that cannot (kinematically) be associated with either disk or determination parameters elemental abundances based on standard analysis using equivalent widths one-dimensional, plane-parallel model atmospheres calculated under assumption local thermodynamical equilibrium (LTE). spectra high resolution (R = 40 000-110 000) signal-to-noise)S/V 150-300) were obtained FEROS spectrograph ESO 1.5 2.2 telescopes, SOFIN PIES spectrographs Nordic Optical Telescope, LIVES E50 Very Large HARPS 3.6 m telescope, MIKE Magellan Clay telescope. from individual Fe I lines corrected for non-LTE effects every step analysis. Results. present parameters, ages, kinematical orbital detailed 0, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Zn, Y. Ba 12 stars. Our data show there an old a-enhanced population, younger less population. While they overlap greatly metallicity between 0.7 < [Fe/HI] than similar +0.1, bimodal distribution [alpha/Fe]. This bimodality becomes even clearer if where larger uncertainties (T-eff 5400 K) are discarded, showing it important constrain set narrow range small differences populations revealed. In addition, we find population placing birthplaces inner while loss-alpha mainly come outer disk, fully consistent recent claims short scale-length alpha-enhanced also investigated properties group neither them presents chemical signatures could suggest disrupted clusters extragalactic accretion remnants ancient merger events. Instead, most likely dynamical features originating within Galaxy. discovered 1D. LTE analysis, utilising ionisation excitation balance Fen produces flat lower main sequence. As exact cause effect unclear chose apply empirical correction. Turn-off more evolved appear unaffected. (Less)
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