2016A&A...593A..36C


Query : 2016A&A...593A..36C

2016A&A...593A..36C - Astronomy and Astrophysics, volume 593A, 36-36 (2016/9-1)

Constraints on CEMP-no progenitors from nuclear astrophysics.

CHOPLIN A., MAEDER A., MEYNET G. and CHIAPPINI C.

Abstract (from CDS):

Context. The CEMP-no stars are long-lived small mass stars presenting a very low iron content and overabundances of carbon with no sign or only very weak signs of s- or r-elements. Although the origin of this abundance pattern is still a matter of debate, it was very likely inherited from a previous massive star, which we call the source star.
Aims. We rely on a recent classification of CEMP-no stars arguing that some of them are made of a material processed by hydrogen burning that was enriched in products of helium burning during the nuclear life of the source star. We examine the possibility of forming CEMP-no stars with this material.
Methods. We study the nucleosynthesis of the CNO cycle and the Ne-Na Mg-Al chains in a hydrogen burning single zone while injecting the helium burning products 12C, 16O, 22Ne, and 26Mg. We investigate the impact of changing density, temperature and the injection rate. The nuclear reaction rates involving the creation and destruction of 27Al are also examined.
Results. 14N, 23Na, 24Mg, and 27Al are formed when injecting 12C, 16O, 22Ne, and 26Mg in the hydrogen burning zone. The 12C/13C ratio is constant under various conditions in the hydrogen burning zone. The predicted [Al/Fe] ratio varies up to ∼2dex depending on the prescription used for the reaction rates involving 27Al.
Conclusions. The experiments we carried out support the view that some CEMP-no stars are made of a material processed by hydrogen burning that comes from a massive star experiencing mild to strong rotational mixing. During its burning, this material was likely enriched in helium burning products. No material coming from the carbon-oxygen rich core of the source star should be added to form the daughter star, otherwise the 12C/13C ratio would be largely above the observed range of values.

Abstract Copyright: © ESO, 2016

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

Simbad objects: 14

goto Full paper

goto View the references in ADS

Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HE 0057-5959 Pe* 00 59 53.9858308128 -59 43 29.745940196   16.4       CEMP-no 29 0
2 HE 0107-5240 Pe* 01 09 29.1554552993 -52 24 34.203535506   15.89 15.07 15.10 14.283 CEMP-no 232 0
3 BPS CS 22958-0042 Pe* 02 01 07.4296353198 -57 16 58.851945318   14.037 14.52 14.222 13.902 CEMP-no 35 0
4 SMSS J031300.36-670839.3 Pe* 03 13 00.3747490864 -67 08 39.336567558           CEMP-no 93 0
5 HE 1300+0157 Pe* 13 02 56.2444113387 +01 41 52.080881619   14.536 14.11 13.678 13.261 CEMP-no 40 0
6 HE 1310-0536 Pe* 13 13 31.1856625664 -05 52 12.533547463   15.055 14.347 13.829   CEMP-no 24 0
7 HE 1327-2326 Pe* 13 30 05.9395582011 -23 41 49.699027289 13.761 14.01 13.55 13.50 12.803 CEMP-no 223 0
8 HE 1410+0213 Pe* 14 13 06.5623968167 +01 59 21.912907907   14.29 13.25 12.734 12.297 CEMP-no 22 0
9 2MASS J14215106-1338135 * 14 21 51.0678047673 -13 38 13.410092314   14.802 14.708 14.176 13.713 ~ 9 0
10 BPS CS 29498-0043 Pe* 21 03 52.1197489072 -29 42 50.344264361   14.8 13.72 13.013 12.406 CEMP-no 89 0
11 UCAC4 219-185099 Pe* 21 30 32.1818570433 -46 16 24.615679322   13.447 12.167 11.902 10.908 ~ 52 0
12 BPS CS 22945-0017 Pe* 23 20 55.6263860111 -63 15 36.787084717   14.83 14.44 14.50   ~ 21 0
13 HE 2323-0256 Pe* 23 26 29.8073543039 -02 39 58.037206596   15.12 14.36   13.358 CEMP-no 173 0
14 HE 2331-7155 Pe* 23 34 36.1726538219 -71 38 50.939940188   14.73   13.82   CEMP-no 8 0

To bookmark this query, right click on this link: simbad:objects in 2016A&A...593A..36C and select 'bookmark this link' or equivalent in the popup menu


2021.11.27-16:32:03

© Université de Strasbourg/CNRS

    • Contact