SIMBAD references

2011MNRAS.415.2093K - Mon. Not. R. Astron. Soc., 415, 2093-2100 (2011/August-2)

The non-local thermodynamic equilibrium barium abundance in dwarf stars in the metallicity range of -1 <[Fe/H] < +0.3.

KOROTIN S., MISHENINA T., GORBANEVA T. and SOUBIRAN C.

Abstract (from CDS):

We present the results of determination of the barium abundance considering the non-local thermodynamic equilibrium (NLTE) effects in 172 dwarf stars in the metallicity range of -1 < [Fe/H] < +0.3, assigned to different Galactic substructures by kinematic criteria. We used a model of the Ba atom with 31 levels of Ba I and 101 levels of Ba II. The atmosphere models for the investigated stars were computed using the ATLAS9 code modified by new opacity distribution functions by Castelli & Kurucz. The NLTE profiles of the unblended Ba II (4554, 5853, 6496 Å) were computed and then compared to those observed. The line 6141 Å was also used, but with an allowance for its correlation with the iron line. The average barium abundances in the thin and thick discs are 0.01±0.08 and -0.03±0.07, respectively. The comparison to the calculations of the Galactic chemical evolution by Serminato et al. was conducted. The trend obtained for the Ba abundance versus [Fe/H] suggests a complex barium production process in the thin and thick discs.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: abundances - stars: late-type - Galaxy: disc - Galaxy: evolution

Simbad objects: 172

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2019.09.21-14:00:59

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