2015A&A...581A..70K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST00:16:36

2015A&A...581A..70K - Astronomy and Astrophysics, volume 581A, 70-70 (2015/9-1)

Grid of theoretical NLTE equivalent widths of four Ba II lines and barium abundance in cool stars.

KOROTIN S.A., ANDRIEVSKY S.M., HANSEN C.J., CAFFAU E., BONIFACIO P., SPITE M., SPITE F. and FRANCOIS P.

Abstract (from CDS):

We present a grid of computed non-local thermodynamic equilibrium (NLTE) equivalent widths (EW) and NLTE abundance corrections for four BaII lines: 4554, 5853, 6141, and 6496Å. The grid can be useful in deriving the NLTE barium abundance in stars having parameters in the following ranges: effective temperature from 4000 K to 6500K, surface gravity logg from 0 to 5, microturbulent velocity 0km/s to 3km/s, metallicity [Fe/H] from -2 to +0.5, and [Ba/Fe] from -0.4 to +0.6. The NLTE abundance can be either derived by EW interpolation (using the observed BaII line EW) or by using the NLTE correction applied to a previously determined LTE abundance. BaII line equivalent widths and the NLTE corrections were calculated using the updated MULTI code and the BaII atomic model that was previously applied to determine the NLTE barium abundance in different types of stars. The grid is available on-line through the web, and we find that the grid Ba NLTE corrections are almost as accurate as direct NLTE profile fitting (to within 0.05-0.08dex). For the weakest BaII line (5853Å) the LTE abundances almost agree with the NLTE abundances, whereas the other three BaII lines, 4554, 6141, and 6496Å, need NLTE corrections even at the highest metallicities tested here. The 4554Å line is extremely strong and should not be used for abundance analysis above [Fe/H]=-1. Furthermore, we tested the impact of different model atmospheres and spectrum synthesis codes and found average differences of 0.06dex and 0.09dex, respectively, for all four lines. At these metallicities we find an average ΔNLTE of ±0.1dex for the three useful Ba lines for subsolar cool dwarfs.

Abstract Copyright:

Journal keyword(s): line: profiles - stars: abundances - stars: late-type

VizieR on-line data: <Available at CDS (J/A+A/581/A70): table4.dat table5.dat>

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * tau Cet PM* 01 44 04.0834226 -15 56 14.926552 4.43 4.22 3.50 2.88 2.41 G8V 1091 1
2 * eps For PM* 03 01 37.6304831834 -28 05 29.376723799   6.68 5.85     G9:V 157 0
3 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1697 1
4 * ksi Hya ** 11 33 00.1150559 -31 51 27.443449 5.17 4.47 3.54 2.84 2.36 G7IIIb 231 0
5 * c Vir PM* 12 20 20.9813348 +03 18 45.260365 7.27 6.12 4.96 4.07 3.46 K0.5IIIbFe-0.5 335 0
6 * eps Vir PM* 13 02 10.5978496 +10 57 32.941443 4.45 3.71 2.79 2.16 1.71 G8III-IIIb 514 0
7 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 683 0
8 V* VW Dra LP* 17 16 29.3992591484 +60 40 14.205431854   7.411 6.318     K1.5IIIb 30 0
9 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1806 0
10 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1024 0
11 * 7 Psc PM* 23 20 20.5830620142 +05 22 52.700020565   6.262 5.069     K1IV 107 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-00:16:36

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