2006A&A...454..917A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST19:12:56

2006A&A...454..917A - Astronomy and Astrophysics, volume 454, 917-931 (2006/8-2)

Analysis of 26 barium stars. II. Contributions of s-, r-, and p-processes in the production of heavy elements.

ALLEN D.M. and BARBUY B.

Abstract (from CDS):

Barium stars show enhanced abundances for the slow neutron capture (s-process) heavy elements, so they are suitable objects for studying s-process elements. The aim of this work is to quantify the contributions of the s-, r-, and p-processes for the total abundance of heavy elements from abundances derived for a sample of 26 barium stars. The abundance ratios between these processes and neutron exposures were studied. The abundances of the sample stars were compared to those of normal stars, thus identifying the fraction relative to the main component of the s-process. The fittings of the σN curves (neutron-capture cross-section times abundance, plotted against atomic mass number) for the sample stars suggest that the material from the companion asymptotic giant branch star had approximately the solar isotopic composition as concerns fractions of abundances relative to the s-process main component. The abundance ratios of heavy elements, hs, ls, and s and the computed neutron exposure are similar to those of post-AGB stars. For some sample stars, an exponential neutron exposure fits the observed data well, whereas a single neutron exposure provides a better fit for others. The comparison of barium and AGB stars supports the hypothesis of binarity for the barium star formation. Abundances of r-elements that are part of the s-process path in barium stars are usually higher than those in normal stars, so barium stars also seemed to be enriched in r-elements, although to a lower degree than s-elements. No dependence on luminosity classes was found in the abundance-ratio behaviour among the dwarfs and giants of the sample of barium stars.

Abstract Copyright:

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/454/917): stars.dat table2.dat table6.dat>

Simbad objects: 26

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Number of rows : 26

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 HD 749 PM* 00 11 38.0949181329 -49 39 21.729950461   9.03 7.88     K0pBa 33 0
2 HD 2454 PM* 00 28 20.0441170647 +10 11 23.308682092   6.47   5.8   F5VSr 162 0
3 HD 5424 SB* 00 55 43.9269897905 -27 53 37.267085541   10.558 9.517 9.690   G8II 44 1
4 HD 8270 Pe* 01 21 09.9840484336 -47 31 51.727592766   9.34 8.82     F8IV 24 0
5 HD 12392 * 02 01 22.7641698509 -04 48 11.767132553   9.56 8.48     G8II 16 0
6 HD 13551 Pe* 02 10 08.2931328892 -60 45 29.341963274   9.86 9.30     F7wF3 30 0
7 HD 22589 SB* 03 37 55.2476467353 -06 58 28.329379028   9.72 9.00     G5II 24 0
8 HD 27271 SB* 04 18 33.8263595544 +02 28 13.914564523   8.53 7.52     G8II 46 0
9 HD 48565 SB* 06 44 54.9136936802 +20 51 38.350227797   7.746 7.183     hF8gF8mF3 63 0
10 HD 76225 ** 08 54 00.8616289930 -26 54 56.385901380   9.73 9.20     F7/G+A(pSr) 32 0
11 HD 87080 SB* 10 02 00.8598789132 -33 41 06.508653916   10.15 9.37     G6III_Ba5.5_CH 45 0
12 HD 89948 SB* 10 22 21.8602764847 -29 33 21.560135988 8.12 8.11 7.55     G2IIIBa1 70 0
13 HD 92545 Pe* 10 40 57.7072314402 -12 11 44.223424837   9.07 9.149 8.25 9.047 F7IV 39 0
14 HD 106191 SB* 12 13 11.3755973322 -15 13 56.425254721   10.73 10.08     F8/G1V 24 0
15 HD 107574 SB* 12 21 51.8580902959 -18 24 00.255862910   8.99 8.54     F3IV/V 45 0
16 HD 116869 Pe* 13 26 37.9602151552 -04 26 44.933514767   10.47 9.50     G8III:Fe-0.5CH1Ba1 22 0
17 HD 123585 SB* 14 09 35.7952107527 -44 22 01.195989267   9.75 9.23     G0III_Ba3_CH 56 0
18 HD 123396 Pe* 14 17 31.5591919267 -83 32 52.136247808   10.14 8.96     G8/K0II/IIIp 31 0
19 HD 147609 SB* 16 21 51.9861832532 +27 22 27.191800307   9.69 9.18     G5 24 0
20 HD 150862 ** 16 44 44.0888580876 -25 12 59.338279935   9.72 9.19     F7V+A(pSr) 27 0
21 HD 188985 Pe* 19 59 58.2969528328 -48 58 31.180568493   9.07 8.56     G2III_Ba1 41 0
22 HD 210709 Pe* 22 12 53.8133886718 -35 25 50.993928886   10.29 9.23     G8II/III 24 0
23 HD 210910 * 22 13 42.2192665496 -03 46 32.860771560   9.57 8.49     G8III 14 0
24 HD 222349 PM* 23 40 00.9452477085 -56 44 26.199316436   9.70 9.22     G5/K0+A/F(Sr) 31 0
25 BD+18 5215 SB* 23 46 56.0386405439 +19 28 22.131367910   10.18 9.68     F/Gp 22 0
26 HD 223938 Pe* 23 53 49.8958215728 -49 59 57.975704922   9.51 8.60     G6pBa 20 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-19:12:56

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