2025ApJ...984....8W

Query : 2025ApJ...984....8W

2025ApJ...984....8W - Astrophys. J., 984, 8 (2025/May-1)

Stellar β–-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive Stars.

WANG X.-X., SUN B.-H., KAJINO T., HE Z.-Y., SUZUKI T., FANG D.-L. and NIU Z.-M.

Abstract (from CDS):

The β–-decay rate of 63Ni, an important branching point, affects the subsequent nucleosynthesis in the weak component of the slow-neutron capture process (weak s-process). To evaluate the impact of the uncertainties of stellar lifetime of 63Ni on abundances, we calculate the contribution to β–-decay rates from its excited states using the large-scale shell model with various interactions and also explore the atomic effects in the highly ionized plasma. In the core He burning stage and the shell C burning stage of massive stars, our new rates can be larger than those from K. Takahashi & K. Yokoi by up to a factor of 4 and 6, respectively. We evaluate the impact of the stellar decay rates of 63Ni on the nucleosynthesis of A = 60 ∼ 90 in a star with an initial mass of 25 M⊙ and solar metallicity. We find that the new rates can lead to abundance changes of 64Ni, 63Cu, 65Cu, 64Zn, 66Zn, 67Zn, and 68Zn by up to 18%, 14%, 7%, 98%, 16%, 15%, and 13%, respectively, after the shell C burning stage at the Lagrangian mass coordinate Mr = 2M⊙. The enhancement of the decay rate of 63Ni increases the weak s-process efficiency of nuclei after 65Cu.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Nucleosynthesis - Helium burning - Carbon burning - Massive stars - S-process

Errata: erratum vol. 985, art. 267 (2025)

Simbad objects: 1

goto Full paper

goto View the references in ADS

Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.125 14.321 14.289 13.358 CEMP-no 184 0

Query : 2025ApJ...984....8W

Basic data :
HE 2323-0256 -- Chemically Peculiar Star
Other object types: otypes_help 		Pe* (2013ApJ), * (UCAC4,BPS,...), NIR (2MASS)
ICRS coord. (ep=J2000) : 		23 26 29.8073738880 -02 39 58.036383180 (Optical) [ 0.0187 0.0184 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		23 23 55.5398909686 -02 56 28.711874667 [ 0.0187 0.0184 90 ]
Gal coord. (ep=J2000) : 		079.5741090443119 -58.1976658471521 [ 0.0187 0.0184 90 ]
Proper motions mas/yr : 		1.726 -1.883 [0.024 0.022 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -125.800000 [0.300000] / z(spectroscopic) -0.000420 [0.000001] / cz -125.77 [0.30]
   (Opt) A 2021MNRAS.503.2539C
Parallaxes (mas): 		0.0919 [0.0242] A 2020yCat.1350....0G
Spectral type: 		CEMP-no C 2019A&A...623A.128H
Fluxes (11) :
B 15.125 [0.03] D 2012yCat.1322....0Z
V 14.321 [0.01] D 2012yCat.1322....0Z
R 14.289 [0.12] E 2012yCat.1322....0Z
G 14.096192 [0.002772] C 2020yCat.1350....0G
I 13.358 [0.005] D 2007ApJS..168..128B
J 12.650 [0.024] C 2003yCat.2246....0C
H 12.159 [0.023] C 2003yCat.2246....0C
K 12.075 [0.024] C 2003yCat.2246....0C
g 14.729 [0.01] D 2012yCat.1322....0Z
r 14.082 [0.01] D 2012yCat.1322....0Z
i 13.758 [0.01] D 2012yCat.1322....0Z
SIMBAD within arcmin
Overlay Simbad points in this preview
Back
All CDSPortal (CDSPortal)
Send to sendBySAMP sendBySAMP
sedIcon
within arcsec sed-help-icon

Identifiers (7) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

UCAC4 437-118029 HE 2323-0256 TIC 301287861 Gaia DR3 2634585342263017984
BPS CS 22949-0037 2MASS J23262980-0239579 Gaia DR2 2634585342263017984

References (184 between 1850 and 2026) (Total 184)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

                from: to:

                 or select by : (not exhaustive, explanation here)

Collections of Measurements Description of Measurements

Velocities : 8    Fe/H : 15    Plx : 2    PM : 2    SpT : 2   

   

External archives :

Link by name to the catalogue in VizieR :

UCAC4 437-118029 2MASS J23262980-0239579 Gaia DR2 2634585342263017984 Gaia DR3 2634585342263017984

Search by coordinates in Vizier (radius: 5 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

The annotation server is currently not available. Sorry for any inconvenience

To bookmark this query, right click on this link: simbad:objects in 2025ApJ...984....8W and select 'bookmark this link' or equivalent in the popup menu