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J/A+A/512/A10      Evolution of massive AGB stars. III.           (Siess, 2010)

Evolution of massive AGB stars. III. The thermally pulsing super-AGB phase. Siess L. <Astron. Astrophys. 512, A10 (2010)> =2010A&A...512A..10S
ADC_Keywords: Models, evolutionary ; Clusters, globular Keywords: stars: AGB and post-AGB - stars: evolution - nuclear reactions, nucleosynthesis, abundances - stars: abundances Abstract: We present the first simulations of the full evolution of super-AGB stars through the entire thermally pulsing AGB phase. We analyse their structural and evolutionary properties and determine the first SAGB yields. Stellar models of various initial masses and metallicities were computed using standard physical assumptions which prevents the third dredge-up. A postprocessing nucleosynthesis code was used to compute the SAGB yields, to quantify the effect of the third dredge-up (3DUP) and to assess the uncertainties associated with the treatment of convection. Owing to their massive oxygen-neon core, SAGB stars suffer weak thermal pulses, have very short interpulse periods and develop very high temperatures at the base of their convective envelope (up to 140x108K), leading to very efficient hot bottom burning. SAGB stars are consequently heavy manufacturers of 4He, 13C, and 14N. They are also able to inject significant amounts of 7Li, 17O, 25Mg, and 26,27Al in the interstellar medium. The 3DUP mainly affects the CNO yields, especially in the lower metallicity models. Our post-processing simulations also indicate that changes in the temperature at the base of the convective envelope, which would result from a change in the efficiency of convective energy transport, have a dramatic impact on the yields and represent another major source of uncertainty. Description: The tables contains the stellar yields of 36 nuclei from H to 37Cl for 20 super-AGB stars of various initial masses between 7.5 and 10.5M and for metallicities ranging between Z=1e-4 and 0.04. The yields are given in solar mass and were computed using the postprocessing code considering the full coupling between the nuclear burning and the diffusive mixing. Table 2 provides the reference yields which do no experience third dredge-ups. Tables 3 and 4 simulate the effect of a high (lambda=0.8) and low (lambda=0.3) 3DUP efficiency. The intershell composition is set to 4He:12C:16O=0.66:0.31:0.02. Tables 5 and 6 simulate the yields which would result from an increase/decrease of the envelope temperature (Tenv) by±10%, respectively. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 247 36 Standard yields (no 3rd dredge-up, λ=0) table3.dat 247 36 High 3rd dredge-up efficiency yields (λ=0.8) table4.dat 247 36 Low 3rd dredge-up efficiency yields (λ=0.3) table5.dat 247 36 High envelope temperature yields (1.1*Tenv) table6.dat 247 36 Low envelope temperature yields (0.9*Tenv)
Byte-by-byte Description of file (# headlines): table?.dat
Bytes Format Units Label Explanations
1- 2 I2 --- A Nucleon number 5- 6 A2 --- El Chemical Species name 8- 19 E12.4 solMass M07.5Z1e-4 Yields from 7.5Msun, Z=1e-4 for species 20- 31 E12.4 solMass M08.0Z1e-4 Yields from 8.0Msun, Z=1e-4 for species 32- 43 E12.4 solMass M08.5Z1e-4 Yields from 8.5Msun, Z=1e-4 for species 44- 55 E12.4 solMass M09.0Z1e-4 Yields from 9.0Msun, Z=1e-4 for species 56- 67 E12.4 solMass M08.0Z1e-3 Yields from 8.0Msun, Z=1e-3 for species 68- 79 E12.4 solMass M08.5Z1e-3 Yields from 8.5Msun, Z=1e-3 for species 80- 91 E12.4 solMass M09.0Z1e-3 Yields from 9.0Msun, Z=1e-3 for species 92-103 E12.4 solMass M08.5Z4e-3 Yields from 8.5Msun, Z=4e-3 for species 104-115 E12.4 solMass M09.0Z4e-3 Yields from 9.0Msun, Z=1e-3 for species 116-127 E12.4 solMass M09.5Z4e-3 Yields from 9.5Msun, Z=4e-3 for species 128-139 E12.4 solMass M10.0Z4e-3 Yields from 10.0Msun, Z=4e-3 for species 140-151 E12.4 solMass M09.0Z8e-3 Yields from 9.0Msun, Z=8e-3 for species 152-163 E12.4 solMass M09.5Z8e-3 Yields from 9.5Msun, Z=8e-3 for species 164-175 E12.4 solMass M10.0Z8e-3 Yields from 10.0Msun, Z=8e-3 for species 176-187 E12.4 solMass M09.0Z2e-2 Yields from 9.0Msun, Z=2e-2 for species 188-199 E12.4 solMass M09.5Z2e-2 Yields from 9.5Msun, Z=2e-2 for species 200-211 E12.4 solMass M10.0Z2e-2 Yields from 10.0Msun, Z=2e-2 for species 212-223 E12.4 solMass M10.5Z2e-2 Yields from 10.5Msun, Z=2e-2 for species 224-235 E12.4 solMass M09.0Z4e-2 Yields from 9.0Msun, Z=4e-2 for species 236-247 E12.4 solMass M09.5Z4e-2 Yields from 9.5Msun, Z=4e-2 for species
Acknowledgements: Lionel Siess, Lionel.Siess(at)astro.ulb.ac.be References: Siess, Paper I 2006A&A...448..717S Siess, Paper II 2007A&A...476..893S
(End) Patricia Vannier [CDS] 11-Jan-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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