J/A+A/524/A45 Overproduction factors of s-nuclei in massive stars (Pumo+, 2010)
Convective overshooting and production of s-nuclei in massive stars during their
core He-burning phase.
Pumo M.L., Contino G., Bonanno A., Zappala R.A.
<Astron. Astrophys. 524, A45 (2010)>
=2010A&A...524A..45P 2010A&A...524A..45P
ADC_Keywords: Models, evolutionary ; Stars, normal ; Stars, metal-deficient ;
Abundances
Keywords: nuclear reactions, nucleosynthesis, abundances - convection -
stars: evolution - stars: interiors
Abstract:
Using the "post-processing" technique, we explore the role of the
convective overshooting on the production of s-nuclei in stellar
models of different initial mass and metallicity (MZAMS in the range
15-25M☉ Z in the range 10-4-0.02), considering a range of
values for the parameter f, which determines the overall efficiency of
convective overshooting. We find enhancements in the production of
s-nuclei until a factor ∼6 (measured as the average overproduction
factor of the 6 s-only nuclear species with 60<A<90) in all our models
of different initial mass and metallicity having f in the range
0.01-0.035 (i.e. models with overshooting), compared to the production
obtained with "no-overshooting" models (i.e. models having the same
initial mass and metallicity but f=10-5). Moreover the results
indicate that the link between the overshooting parameter f and the
s-process efficiency is essentially monotonic in all our models of
different initial mass and metallicity. Also evident is the higher
s-process efficiency when, for a given f value, we progressively
increase both the mass of the models from 15 to 25M☉ and the Z
value from 10-4 to 0.02.
Description:
We present the overproduction factors of the 49 s-nuclei having mass
number A in the range 69-209, for all our models of different initial
mass, initial metallicity and f value.
The values obtained by The, El Eid & Meyer (2007ApJ...655.1058T 2007ApJ...655.1058T) for
their Z=0.02 stellar models with a similar mass and input physics are
also reported in tablea4.dat for comparison.
All the data refer to the end of the core He-burning phase.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea4.dat 135 49 Overproduction factors for all the models with
initial metallicity Z=0.02
tablea5.dat 125 49 Overproduction factors for all the M=20M☉
models with initial metallicity Z<0.02
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See also:
VI/109 : Population Synthesis Models at very low metallicities (Schaerer, 2003)
VI/118 : Stellar Models until He burning (Claret+ 1995-1998)
Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- A [69/209] Mass number
4- 5 A2 --- El Nuclide (chemical) symbol
8- 15 E8.3 --- M15T07 ? Overproduction factors obtained by The,
El Eid & Meyer (2007ApJ...655.1058T 2007ApJ...655.1058T) for
their Z=0.02, M=15M☉ stellar model (G1)
18- 25 E8.3 --- M15f.001 Overproduction factors for our Z=0.02,
M=15M☉ stellar model with overshooting
parameter f=0.00001 (G1)
28- 35 E8.3 --- M15f1 Overproduction factors for our Z=0.02,
M=15M☉ stellar model with overshooting
parameter f=0.01 (G1)
38- 45 E8.3 --- M15f2 Overproduction factors for our Z=0.02,
M=15M☉ stellar model with overshooting
parameter f=0.02 (G1)
48- 55 E8.3 --- M15f3.5 Overproduction factors for our Z=0.02,
M=15M☉ stellar model with overshooting
parameter f=0.035 (G1)
58- 65 E8.3 --- M20T07 ? Overproduction factors obtained by The,
El Eid & Meyer (2007ApJ...655.1058T 2007ApJ...655.1058T) for
their Z=0.02, M=20M☉ stellar model (G1)
68- 75 E8.3 --- M20f0001 Overproduction factors for our Z=0.02,
M=20M☉ stellar model with overshooting
parameter f=0.00001 (G1)
78- 85 E8.3 --- M20f1 Overproduction factors for our Z=0.02,
M=20M☉ stellar model with overshooting
parameter f=0.01 (G1)
88- 95 E8.3 --- M20f2 Overproduction factors for our Z=0.02,
M=20M☉ stellar model with overshooting
parameter f=0.02 (G1)
98-105 E8.3 --- M20f3.5 Overproduction factors for our Z=0.02,
M=20M☉ stellar model with overshooting
parameter f=0.035 (G1)
108-115 E8.3 --- M25T07 ? Overproduction factors obtained by The,
El Eid & Meyer (2007ApJ...655.1058T 2007ApJ...655.1058T) for
their Z=0.02, M=25M☉ stellar model (G1)
118-125 E8.3 --- M25f.001 Overproduction factors for our Z=0.02,
M=25M☉ stellar model with overshooting
parameter f=0.00001 (G1)
128-135 E8.3 --- M25f1 Overproduction factors for our Z=0.02,
M=25M☉ stellar model with overshooting
parameter f=0.01 (G1)
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Byte-by-byte Description of file: tablea5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- A [69/209] Mass number
4- 5 A2 --- El Nuclide (chemical) symbol
8- 15 E8.3 --- M20Z.01f.001 Overproduction factors for our
Z=0.0001, M=20M☉ stellar model with
overshooting parameter f=0.00001 (G1)
18- 25 E8.3 --- M20Z.01f1 Overproduction factors for our
Z=0.0001, M=20M☉ stellar model with
overshooting parameter f=0.01 (G1)
28- 35 E8.3 --- M20Z.01f2 Overproduction factors for our
Z=0.0001, M=20M☉ stellar model with
overshooting parameter f=0.02 (G1)
38- 45 E8.3 --- M20Z.01f3.5 Overproduction factors for our
Z=0.0001, M=20M☉ stellar model with
overshooting parameter f=0.035 (G1)
48- 55 E8.3 --- M20Z.5f.001 Overproduction factors for our
Z=0.005, M=20M☉ stellar model with
overshooting parameter f=0.00001 (G1)
58- 65 E8.3 --- M20Z.5f1 Overproduction factors for our
Z=0.005, M=20M☉ stellar model with
overshooting parameter f=0.01 (G1)
68- 75 E8.3 --- M20Z.5f2 Overproduction factors for our
Z=0.005, M=20M☉ stellar model with
overshooting parameter f=0.02 (G1)
78- 85 E8.3 --- M20Z.5f3.5 Overproduction factors for our
Z=0.005, M=20M☉ stellar model with
overshooting parameter f=0.035 (G1)
88- 95 E8.3 --- M20Z1f.001 Overproduction factors for our
Z=0.01, M=20M☉ stellar model with
overshooting parameter f=0.00001 (G1)
98-105 E8.3 --- M20Z1f1 Overproduction factors for our
Z=0.01, M=20M☉ stellar model with
overshooting parameter f=0.01 (G1)
108-115 E8.3 --- M20Z1f2 Overproduction factors for our
Z=0.01, M=20M☉ stellar model with
overshooting parameter f=0.02 (G1)
118-125 E8.3 --- M20Z1f3.5 Overproduction factors for our
Z=0.01, M=20M☉ stellar model with
overshooting parameter f=0.035 (G1)
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Global Notes:
Note (G1): the overproduction factor of a nuclid is the ratio of mass
fractions of s-only nucleus at the end of s-process, to the initial
mass fraction of the same nucleus (see section 4 of the paper for
details)
Acknowledgements:
Maria Letizia Pumo, mlpumo(at)oact.inaf.it
(End) Maria Letizia Pumo [INAF-OACt, Italy], Patricia Vannier [CDS] 26-Oct-2010