2022A&A...657A..28Y


Query : 2022A&A...657A..28Y

2022A&A...657A..28Y - Astronomy and Astrophysics, volume 657A, 28-28 (2022/1-1)

First models of the s process in AGB stars of solar metallicity for the stellar evolutionary code ATON with a novel stable explicit numerical solver.

YAGUE LOPEZ A., GARCIA-HERNANDEZ D.A., VENTURA P., DOHERTY C.L., DEN HARTOGH J.W., JONES S.W. and LUGARO M.

Abstract (from CDS):

Aims. We describe the first s-process post-processing models for asymptotic giant branch (AGB) stars of masses 3, 4, and 5 M at solar metallicity (Z = 0.018) computed using the input from the stellar evolutionary code ATON. Methods. The models are computed with the new code SNUPPAT (S-process NUcleosynthesis Post-Processing code for ATON), which includes an advective scheme for the convective overshoot that leads to the formation of the main neutron source, 13C. Each model is post-processed with three different values of the free overshoot parameter. Included in the code SNUPPAT is the novel Patankar-Euler-Deflhard explicit numerical solver, which we use to solve the nuclear network system of differential equations. Results. The results are compared to those from other s-process nucleosynthesis codes (Monash, FRUITY, and NuGrid), as well as observations of s-process enhancement in AGB stars, planetary nebulae, and barium stars. This comparison shows that the relatively high abundance of 12C in the He-rich intershell in ATON results in an s-process abundance pattern that favours the second over the first s-process peak for all the masses explored. Also, our choice of an advective as opposed to a diffusive numerical scheme for the convective overshoot results in significant s-process nucleosynthesis for the 5 M models as well, which may be in contradiction with observations.

Abstract Copyright: © ESO 2021

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - methods: numerical - nuclear reactions, nucleosynthesis, abundances

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* Z Psc C* 01 16 05.0304050160 +25 46 09.689905056 12.85 9.46 6.84     C-N5 172 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16509 1
3 NGC 2440 PN 07 41 54.91 -18 12 29.7   18.9       ~ 644 2
4 BD-14 2678 SB* 08 51 55.5620549304 -14 39 09.388237284   10.781 9.849     K5 33 0
5 V* U Hya C* 10 37 33.2729535 -13 23 04.352923 13.29 7.51 4.82 3.05 1.78 C-N5 293 0
6 NGC 3918 PN 11 50 17.7709504944 -57 10 57.017302428   10.0 8.5     ~ 375 0
7 V* SS Vir C* 12 25 14.3948245008 +00 46 10.946740368 15.84 10.79 6.60     C-N4.5: 201 1
8 V* SZ Sgr C* 17 44 56.4759363195 -18 39 26.321230341 15.08 11.27 8.52 8.631 7.90 C-N5.5 82 0
9 V* S Sct C* 18 50 20.0367791256 -07 54 27.429169356 13.93 9.89 6.80     C-N5 205 0
10 V* AW Cyg C* 19 28 47.5684705704 +46 02 38.140787184   12.07 11.00     C4,5 82 0
11 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2416 1
12 V* V460 Cyg C* 21 42 01.0830893088 +35 30 36.719916552 12.97 8.32 5.84 4.10 2.71 C-N5 207 1

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2023.01.30-21:33:04

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