Non-standard s-process in low metallicity massive rotating stars

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Table 1

Parameters of the 25 M_⊙ models calculated.

Model^a

B2^b

B4^b

C4^b

10^-3

10^-5

10^-7

[Fe/H]

−1.8

−3.8

−5.8

υ_ini/υ_crit

0.4

0.5

0.4

0.6

⟨ υ ⟩ _MS^c

285

333

428

383

588

ΔX(²²Ne)^d

7.52(−4)

4.08(−3)

7.21(−6)

1.23(−3)

1.27(−3)

3.83(−3)

3.75(−3)

1.05(−4)

4.57(−3)

4.44(−3)

X(²²Ne)

4.16(−4)

6.22(−4)

4.14(−6)

1.69(−4)

1.82(−4)

4.94(−4)

4.85(−4)

3.81(−5)

2.68(−4)

3.11(−4)

n_c^e

1.64

12.7

0.08

5.77

23.1

16.5

31.8

14.0

33.5

48.5

pre-SN yields [M_⊙]

1.66(−8)

1.13(−5)

2.60(−11)

8.70(−9)

3.82(−7)

2.05(−7)

4.36(−7)

1.08(−9)

3.66(−9)

3.02(−9)

f(Sr)

1.75

501.4

1.12

28.86

1724

944.7

1968

489.1

1650

1361

2.13(−9)

2.29(−8)

3.56(−12)

7.41(−11)

6.49(−9)

4.89(−10)

4.73(−8)

3.80(−10)

9.86(−10)

2.95(−9)

f(Ba)

1.34

3.87

1.06

2.10

106.1

9.07

767.0

615.6

1598

4771

Notes.

^(a)

Model names (1st line) include a letter and a number. The letter refers to the initial metallicity, Z (2nd line) and the number to the initial rotation/17O(α,γ) rate used. 0 is for non-rotating models, 1 for models with constant υ_ini/υ_crit = 0.4, 3 for increasing υ_ini/υ_crit:0.5 − 0.6 with decreasing Z and 2 and 4 for lower 17O(α,γ) rates (CF88/10).

^(b)

Model with the 17O(α,γ) reaction rate of CF88 divided by 10.

^(c)

in km s^-1.

^(d)

Since ²²Ne is produced and destroyed at the same time in rotating stars, we derived this value from the sum of the ²⁵Mg and ²⁶Mg produced during central He-burning.

^(e)

Number of neutron captures per initial seed.

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