2014A&A...566A..16C


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.06CEST08:29:50

2014A&A...566A..16C - Astronomy and Astrophysics, volume 566A, 16-16 (2014/6-1)

Possible discovery of the r-process characteristics in the abundances of metal-rich barium stars.

CUI W.Y., ZHANG B., SHI J.R., ZHAO G., WANG W.J. and NIU P.

Abstract (from CDS):

We study the abundance distributions of a sample of metal-rich barium stars provided by Pereira et al. (2011A&A...533A..51P) to investigate the s- and r-process nucleosynthesis in the metal-rich environment. We compared the theoretical results predicted by a parametric model with the observed abundances of the metal-rich barium stars. We found that six barium stars have a significant r-process characteristic, and we divided the barium stars into two groups: r-rich barium stars (Cr>5.0, [La/Nd]<0) and normal barium stars. The behavior of the r-rich barium stars seems more like that of the metal-poor r-rich and CEMP-r/s stars. We suggest that the most possible formation mechanism for these stars is the s-process pollution, although their abundance patterns can be fitted very well when the pre-enrichment hypothesis is included. That we cannot explain them well using the s-process nucleosynthesis alone may be due to our incomplete knowledge on the production of Nd, Eu, and other relevant elements by the s-process in metal-rich and super metal-rich environments (see details in Pereira et al., 2011A&A...533A..51P).

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: AGB and post-AGB - binaries: general

Status at CDS:  

Simbad objects: 17

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Number of rows : 17

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 5424 SB* 00 55 43.9269897905 -27 53 37.267085541   10.558 9.517 9.690   G8II 43 1
3 HD 46040 * 06 29 12.1053902060 -40 22 48.956169472 10.27 9.13 7.88     K0pBa 23 0
4 HD 49841 SB* 06 50 38.9706616265 +05 39 46.373836016   9.60 8.60     G5 25 0
5 CD-25 6606 Pe* 08 49 20.7223246704 -26 12 55.862586464   10.24 9.28     K0Ba0.8 8 0
6 HD 82765 Pe* 09 31 01.4079754081 -66 02 03.433103164   9.50 8.42     G8III 13 0
7 HD 84734 Pe* 09 43 57.3887135736 -68 35 16.924127125   9.16 8.10     G8II 8 0
8 HD 85205 Pe* 09 49 18.7896003171 -35 57 39.879216812   9.41 8.36     G6II 14 0
9 HD 100012 Pe* 11 30 20.6691965652 -25 47 54.977037912 8.51 7.64 6.59     G9III 34 0
10 HD 101079 SB* 11 37 54.2555151149 -01 09 03.907639772   9.20 8.18     K1Ba1 18 0
11 HD 123396 Pe* 14 17 31.5591919267 -83 32 52.136247808   10.14 8.96     G8/K0II/IIIp 31 0
12 HD 130386 Pe* 14 48 02.2723824046 -05 30 23.829443815   8.92 7.78     K0II 32 0
13 HD 139660 * 15 39 43.7925618253 -09 37 09.802925249   9.54 8.38     K0II/III 12 0
14 HD 198590 Pe* 20 52 43.1263023396 -39 06 31.070890770   7.85 6.88     G8II 20 0
15 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 405 0
16 HD 212209 Pe* 22 24 12.6917474014 -60 41 07.061637812   10.07 8.91     K1II/IIICNIb 11 0
17 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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2020.04.06-08:29:50

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