J/ApJS/155/651 Evolution of extremely metal-poor stars (Herwig+, 2004)
Evolution and yields of extremely metal-poor intermediate-mass stars.
Herwig F.
<Astrophys. J. Suppl. Ser., 155, 651-666 (2004)>
=2004ApJS..155..651H 2004ApJS..155..651H
ADC_Keywords: Models, evolutionary ; Abundances
Keywords: nuclear reactions, nucleosynthesis, abundances -
stars: AGB and post-AGB - stars: evolution - stars: interiors
Abstract:
Intermediate-mass stellar evolution tracks from the main sequence to
the tip of the AGB for five initial masses (2-6M☉) and
metallicity Z=0.0001 have been computed. The detailed one-dimensional
structure and evolution models include exponential overshooting, mass
loss, and a detailed nucleosynthesis network with updated nuclear
reaction rates. The network includes a two-particle heavy neutron sink
for approximating neutron density in the He-shell flash. It is shown
how the neutron-capture nucleosynthesis is important in models of very
low metallicity for the formation of light neutron-heavy species, like
sodium or the heavy neon and magnesium isotopes. The models have high
resolution, as required for modeling the third dredge-up. All
sequences have been followed from the pre-main sequence to the end of
the AGB when all envelope mass is lost. Detailed structural and
chemical model properties as well as yields are presented. This set
of stellar models is based on standard assumptions and updated input
physics. It can be confronted with observations of extremely
metal-poor stars and may be used to assess the role of AGB stars in
the origin of abundance anomalies of some globular cluster members of
correspondingly low metallicity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 81 101 Reaction network
table5.dat 63 23 Yields
table6.dat 299 504 Structure and abundance evolution of computed
tracks
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See also:
VI/65 : Evolutionary models of evolved stars (Dorman+ 1993)
VI/96 : Evolutionary Sequences (Fagotto+ 1993-96)
VI/109 : Population Synthesis Models at very low metallicities
(Schaerer, 2003)
VI/118 : Stellar Models until He burning (Claret+ 1995-1998)
J/A+A/299/755 : Stellar evolution. II. Post-AGB (Bloecker+, 1995)
J/A+A/401/1063 : Evolutionary synthesis models. III. (Anders+, 2003)
J/A+A/424/919 : Stellar models grids. Z=0.02, M=0.8 to 125 (Claret, 2004)
J/A+A/440/647 : New grids of stellar models. II. (Claret, 2005)
J/A+A/453/769 : New grids of stellar models. III. (Claret+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 37 A37 --- Type Type of reaction
39- 41 I3 --- ID Identification number of the reaction
43- 79 A37 --- React Reaction description
81 A1 --- r_React Reference for React (1)
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Note (1): References as follows:
1 = NACRE adopted;
2 = Horiguchi et al. (1996, Chart of the Nuclides (Tokai: Japan
Atomic Energy Research Inst.)
3 = Caughlan & Fowler (1988, At. Data Nucl. Data Tables, 40, 283)
4 = Iliadis et al. (2001ApJS..134..151I 2001ApJS..134..151I)
5 = Bao et al. (2000, At. Data Nucl. Data Tables, 76, 70)
6 = Beer et al. (2001, Nucl. Phys. A, 705, 239)
7 = Bao et al. (2000, At. Data Nucl. Data Tables, 75, 1)
8 = Hauser-Feshbach (Jorissen & Gorely, 2001, Nucl. Phys. A, 688, 508)
9 = see Jorissen & Goriely (2001, Nucl. Phys. A, 688, 508)
a = Wiescher et al. (1990ApJ...363..340W 1990ApJ...363..340W)
b = Koehler & O'Brien (1989, Phys. Rev. C, 39, 1655)
c = Takahashi Yokoi (1987, At. Data Nucl. Data Tables, 36, 375)
d = Goriely (1999, Cat. J/A+A/342/881)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Num Sequential number of the species
4- 8 A5 --- Species Species name (as in table6)
10- 19 E10.4 solMass E82 The 2 solar mass (E82) model yield (1)
21- 30 E10.4 solMass E84 The 3 solar mass (E84) model yield (1)
32- 41 E10.4 solMass E85 The 4 solar mass (E85) model yield (1)
43- 52 E10.4 solMass E79 The 5 solar mass (E79) model yield (1)
54- 63 E10.4 solMass E86 The 6 solar mass (E86) model yield (1)
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Note (1): Normalized formed and ejected mass of element integrated
over the stellar lifetime
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Name Sequence name (E79, E82, E84, E85, E86)
5- 9 I5 --- Model Model number
11- 16 F6.4 solMass Mass Stellar mass
18- 32 E15.8 yr Age Age (Zero at first TP (thermal-pulse))
34- 39 F6.4 [K] logTeff Log of the effective temperature
41- 46 F6.4 [solLum] logL Log of the luminosity in solar units
48- 57 E10.4 --- H H surface abundance
59- 68 E10.4 --- He4 He4 surface abundance
70- 79 E10.4 --- C12 C12 surface abundance
81- 90 E10.4 --- C13 C13 surface abundance
92-101 E10.4 --- N14 N14 surface abundance
103-112 E10.4 --- N15 N15 surface abundance
114-123 E10.4 --- O16 O16 surface abundance
125-134 E10.4 --- O17 O17 surface abundance
136-145 E10.4 --- O18 O18 surface abundance
147-156 E10.4 --- Ne20 Ne20 surface abundance
158-167 E10.4 --- Ne21 Ne21 surface abundance
169-178 E10.4 --- Ne22 Ne22 surface abundance
180-189 E10.4 --- Na23 Na23 surface abundance
191-200 E10.4 --- Mg24 Mg24 surface abundance
202-211 E10.4 --- Mg25 Mg25 surface abundance
213-222 E10.4 --- Mg26 Mg26 surface abundance
224-233 E10.4 --- Al26G Al26G surface abundance
235-244 E10.4 --- Al27 Al27 surface abundance
246-255 E10.4 --- Si28 Si28 surface abundance
257-266 E10.4 --- Si29 Si29 surface abundance
268-277 E10.4 --- Si30 Si30 surface abundance
279-288 E10.4 --- G63 G63 surface abundance
290-299 E10.4 --- L1 L1 surface abundance
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 26-Jan-2007