2016A&A...593A..62M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST16:51:56

2016A&A...593A..62M - Astronomy and Astrophysics, volume 593A, 62-62 (2016/9-1)

The odd-isotope fractions of barium in CEMP-r/s star HE 0338-3945 and r-II star CS 31082-001.

MENG X.Y., CUI W.Y., SHI J.R., JIANG X.H., ZHAO G., ZHANG B. and LI J.

Abstract (from CDS):

We report the first measurement of the odd-isotope fractions for barium, fodd,Ba in two extremely metal-poor stars: a CEMP-r/s star HE 0338-3945 ([Fe/H]=-2.42±0.11) and an r-II star CS 31082-001 ([Fe/H]=-2.90±0.13). The measured fodd,Ba values are 0.23±0.12 corresponding to 34.3±34.3% of the r-process contributions for HE 0338-3945 and 0.43±0.09 corresponding to 91.4±25.7% of the r-process contribution to Ba production for CS 31082-001. The high r-process signature of barium in CS 31082-001 (91.4±25.7%) suggests that the majority of the heavy elements in this star were synthesised via an r-process path, while the lower r-process value (34.3±34.3%) found in HE 0338-3945 indicates that the heavy elements in this star formed through a mix of s-process and r-process synthesis. These conclusions are consistent with studies based on asymptotic giant branch star model calculations to fit their abundance distributions.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: Population II

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BPS CS 31062-0050 Pe* 00 30 31.0633474070 -12 05 10.873150611   13.7 13.05 12.681 12.309 CEMP-r/s 60 0
2 CD-24 266 BS* 00 40 47.9313778053 -24 07 34.183052519   12.955 12.656 12.441 12.216 CEMP-s 90 0
3 SKB 2 Pe* 00 41 39.8197261334 -26 18 54.463949137   13.338 12.221 11.704 11.321 CEMP-s 84 0
4 BPS CS 31082-0001 Pe* 01 29 31.1311330115 -16 00 45.496485322 12.527 12.427 11.642 11.189 10.713 CEMP 251 0
5 BPS CS 29526-0110 Pe* 03 27 43.6395462631 -23 00 29.931204041   13.71 13.35 13.116 12.834 CEMP-r/s 48 0
6 HE 0338-3945 Pe* 03 39 55.0065616032 -39 35 42.904334997   15.753 15.333 15.098 14.787 CEMP-r/s 34 0
7 EPIC 212685903 Pe* 14 07 42.9726133296 -08 36 14.381851613   14.770 13.998 13.591 13.171 CEMP-s 11 0
8 HD 140283 Pe* 15 43 03.0967798658 -10 56 00.595803430 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 873 0
9 LP 625-44 Pe* 16 43 14.0364804654 -01 55 30.408914037   12.84 11.68     CEMP-s 102 0
10 HE 2134-3940 Pe* 21 37 45.7673672486 -39 27 22.314122762   13.790 12.660 12.160 11.760 KIIvw 82 0
11 HE 2148-1247 Pe* 21 51 17.9099257554 -12 33 41.560711332   15.2 14.79     CEMP-r/s 43 0
12 HD 209621 Pe* 22 04 25.1407342403 +21 03 09.003434369   10.41 8.86     C-H3III: 101 0
13 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 419 0

    Equat.    Gal    SGal    Ecl

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