2015A&A...583A..77L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:32:58

2015A&A...583A..77L - Astronomy and Astrophysics, volume 583A, 77-77 (2015/11-1)

Post-AGB stars in the Magellanic Clouds and neutron-capture processes in AGB stars.

LUGARO M., CAMPBELL S.W., VAN WINCKEL H., DE SMEDT K., KARAKAS A.I. and KAEPPELER F.

Abstract (from CDS):

We explore modifications to the current scenario for the slow neutron-capture process (the s-process) in asymptotic giant branch (AGB) stars to account for the Pb deficiency observed in post-AGB stars of low metallicity ([Fe/H]≃-1.2) and low initial mass (≃1-1.5M) in the Large and Small Magellanic Clouds. We calculated the stellar evolution and nucleosynthesis for a 1.3M star with [Fe/H]=-1.3 and tested different amounts and distributions of protons leading to the production of the main neutron source within the 13C-pocket and proton ingestion scenarios. No s-process models can fully reproduce the abundance patterns observed in the post-AGB stars. When the Pb production is lowered, the abundances of the elements between Eu and Pb, such as Er, Yb, W, and Hf, are also lowered to below those observed. Neutron-capture processes with neutron densities intermediate between the s and the rapid neutron-capture processes may provide a solution to this problem and be a common occurrence in low-mass, low-metallicity AGB stars.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: AGB and post-AGB

Simbad objects: 24

goto Full paper

goto View the reference in ADS

Number of rows : 24

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 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 OGLE SMC-LPV-4910 pA* 00 44 41.1033737346 -73 21 36.127700113   17.06 15.61 15.44 14.515 G:I 19 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
5 CD-26 304 Pe* 00 57 18.1376089543 -25 26 09.699477820   13.57 12.69 12.198 11.759 CEMP-s 61 1
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
7 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
8 2MASS J05063210-7142298 pA? 05 06 32.1298124432 -71 42 29.926032757 14.801 14.717 14.298 13.950 13.780 A3Iab/F0Ibpe 12 0
9 IRAS S05211-6926 LP* 05 20 43.858 -69 23 40.31 17.618 16.515 15.075 13.92 13.887 F5Ib(e) 17 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
11 2MASS J05325071-7139257 LP* 05 32 50.7148448136 -71 39 25.725291413 17.985 16.533 15.069 14.029 13.803 F6Ia 14 0
12 2MASS J05325347-6959152 pA? 05 32 53.480 -69 59 15.20 18.481 17.369 16.056 15.130 15.114 G5 7 0
13 SDSS J091243.72+021623.6 Pe* 09 12 43.7230744402 +02 16 23.718454537           CEMP-s 20 0
14 NAME SDSS J1349-0229 Pe* 13 49 13.5415939676 -02 29 42.784321366           CEMP-s 20 0
15 BPS CS 30301-0015 Pe* 15 08 56.8433023195 +02 30 18.628172611   14.04 13.04   12.063 CEMP-s 43 0
16 LP 625-44 Pe* 16 43 14.0364804654 -01 55 30.408914037   12.84 11.68     CEMP-s 101 0
17 BPS CS 22964-0161 SB* 20 03 25.5362187973 -38 38 35.324239028   14.9 14.41 14.63   CEMP-s 42 0
18 HD 196944 Pe* 20 40 46.0790261041 -06 47 50.650812411   9.01 8.40 8.08   CEMP-s 86 0
19 BPS CS 22880-0074 Pe* 20 46 03.2162078511 -20 59 14.111093923   13.84 13.27 12.770 12.382 CEMP-s 45 0
20 BPS CS 22898-0027 Pe* 21 05 45.0995574992 -18 36 57.505496795   13.26 12.76 12.476 12.094 CEMP-r/s 80 0
21 BPS CS 30322-0023 * 21 30 32.1818570433 -46 16 24.615679322   13.473 12.166 11.498 10.908 ~ 46 0
22 HE 2148-1247 Pe* 21 51 17.9099257554 -12 33 41.560711332   15.2 14.79     CEMP-r/s 43 0
23 HD 209621 Pe* 22 04 25.1407342403 +21 03 09.003434369   10.41 8.86     C-H3III: 98 0
24 BPS CS 29513-0032 Pe* 23 22 19.0938680077 -39 44 24.310494318 14.757 14.97 14.47     ~ 14 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2015A&A...583A..77L and select 'bookmark this link' or equivalent in the popup menu


2020.07.08-04:32:58

© Université de Strasbourg/CNRS

    • Contact