J/A+A/552/A128 Stellar abundances of neutron-capture elements (Mishenina+, 2013)
Abundances of neutron-capture elements in stars of the Galactic disk
substructures.
Mishenina T.V., Pignatari M., Korotin S.A., Soubiran C., Charbonnel C.,
Thielemann F.-K., Gorbaneva T.I., Basak N.Yu.
<Astron. Astrophys. 552, A128 (2013)>
=2013A&A...552A.128M 2013A&A...552A.128M
ADC_Keywords: Stars, dwarfs ; Abundances ; Spectroscopy
Keywords: nuclear reactions, nucleosynthesis, abundances - stars: abundances -
stars: late-type - Galaxy: evolution
Abstract:
The aim of this work is to present and discuss the observations of the
iron peak (Fe, Ni) and neutron-capture element (Y, Zr, Ba, La, Ce, Nd,
Sm, and Eu) abundances for 276 FGK dwarfs, located in the galactic
disk with metallicity -1<[Fe/H]<+0.3.
Atmospheric parameters and chemical composition of the studied stars
were determined from an high resolution, high signal-to-noise echelle
spectra obtained with the echelle spectrograph ELODIE at the
Observatoire de Haute-Provence (France). Effective temperatures were
estimated by the line depth ratio method and from the Hα
line-wing fitting. Surface gravities (logg) were determined by
parallaxes and the ionization balance of iron. Abundance
determinations were carried out using the LTE approach, taking the
hyperfine structure for Eu into account, and the abundance of Ba was
computed under the NLTE approximation.
We are able to assign most of the stars in our sample to the
substructures of the Galaxy thick disk, thin disk, or Hercules stream
according to their kinematics. The classification of 27 stars is
uncertain. For most of the stars in the sample, the abundances of
neutron-capture elements have not been measured earlier. For all of
them, we provide the chemical composition and discuss the contribution
from different nucleosynthesis processes.
Description:
Tables with abundances for 276 stars of the thick disk, thin disk, and
Hercules stream.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 64 276 The stellar parameters and α-element and
Ni abundances in studied stars
table5.dat 60 276 n-capture element abundances in studied stars
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See also:
J/A+A/287/927 : Abundances for lines of n-capture in 19 stars (Gratton+ 1994)
J/AZh/81/209 : Neutron capture in stars: neodymium (Mashonkina+ 2004)
J/A+A/525/A63 : Abundances in Ba stars (Allen+, 2011)
J/A+A/547/A106 : Li abundances in the FGK dwarfs (Mishenina+, 2012)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 15 I4 K Teff Effective temperature
17- 20 F4.2 [cm/s2] logg Log surface gravity
22- 26 F5.2 [Sun] [Fe/H] Value of [Fe/H]
28- 32 F5.2 --- Prob ?=99.99 Probability that the star belongs to
substructure
34- 38 F5.2 [Sun] [O/Fe] ?=99.99 Oxygen (Z=8) abundance [O/Fe]
40- 44 F5.2 [Sun] [Mg/Fe] ?=99.99 Magnesium (Z=12) abundance [Mg/Fe]
46- 50 F5.2 [Sun] [Si/Fe] ?=99.99 Silicium (Z=14) abundance [Si/Fe]
52- 56 F5.2 [Sun] [Ca/Fe] ?=99.99 Calcium (Z=20) abundance [Ca/Fe]
58- 62 F5.2 [Sun] [Ni/Fe] ?=99.99 Nickel (Z=28) abundance [Ni/Fe]
64 A1 --- Type [ABCD] Population type code (G1)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 16 F5.2 [Sun] [Y/Fe] ?=99.99 Yttrium (Z=39) abundance [Y/Fe]
18- 22 F5.2 [Sun] [Zr/Fe] ?=99.99 Zirconium (Z=40) abundance [Zr/Fe]
24- 28 F5.2 [Sun] [Ba/Fe] ?=99.99 Barium (Z=56) abundance [Ba/Fe]
30- 34 F5.2 [Sun] [La/Fe] ?=99.99 Lanthanum (Z=57) abundance [La/Fe]
36- 40 F5.2 [Sun] [Ce/Fe] ?=99.99 Cerium (Z=57) abundance [Ce/Fe]
42- 46 F5.2 [Sun] [Nd/Fe] ?=99.99 Neodymium (Z=60) abundance [Nd/Fe]
48- 52 F5.2 [Sun] [Sm/Fe] ?=99.99 Samarium (Z=62) abundance [Sm/Fe]
54- 58 F5.2 [Sun] [Eu/Fe] ?=99.99 Europium (Z=63) abundance [Eu/Fe]
60 A1 --- Type [ABCD] Population type code (G1)
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Global notes:
Note (G1): Type as follows:
A = thin disk
B = thick disk
C = Hercules stream
D = unknown
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Acknowledgements:
T.V. Mishenina, tamar (at)deneb1.odessa.ua
(End) T.V. Mishenina [Odessa Nat. Univ., Ukraine], P. Vannier [CDS] 08-Mar-2013