J/MNRAS/298/525 Stellar evolution models for Z = 0.0001 to 0.03 (Pols+ 1998)
Stellar evolution models for Z = 0.0001 to 0.03.
Pols O.R., Schroeder K.-P., Hurley J.R., Tout C.A., Eggleton P.P.
<Mon. Not. R. Astron. Soc., 298, 525-536 (1998)>
=1998MNRAS.298..525P 1998MNRAS.298..525P
ADC_Keywords: Models, evolutionary
Keywords: convection - stars: evolution - Hertzsprung-Russell (HR) diagram -
stars: population II - open clusters and associations: general -
galaxies: stellar content
Abstract:
We have calculated a grid of empirically well tested evolutionary
tracks with masses M between 0.5 and 50M☉, spaced by
approximately 0.1 in log M, and with metallicities Z=0.0001, 0.0003,
0.001, 0.004, 0.01, 0.02 and 0.03. We use a robust and fast evolution
code with a self-adaptive non-Lagrangian mesh, which employs the
mixing-length theory but treats convective mixing as a diffusion
process, solving simultaneously for the structure and the chemical
composition. The hydrogen and helium abundances are chosen as
functions of the metallicity: X=0.76-3.0Z and Y=0.24+2.0Z. Two sets of
models were computed, one without and one with a certain amount of
enhanced mixing or 'overshooting'.
Description:
The results of the models studied in the paper are stored in the
"evgrid" subdirectory, which includes for the metallicities/masses
studied the ZAMS parameters and the evolutionary tracks computed with
or without overshooting. A set of Fortran programs is also included
which computes luminosities, radiuses, absolute magnitudes, and colors
in the UBVRI Johnson-Cousins as a function of stellar age for any
interpolation in the grid of models; a README file in this "evgrid"
subdirectory gives details for an extended usage of the models.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
evgrid/* . 38 The grid of models and interpolation programs
summary.dat 173 2827 Summary of critical turning points
ubvri_k.dat 52 6041 *Synthetic Johnson-Cousins BVRI colors (Kurucz)
ubvri_c.dat 52 6041 *Synthetic Johnson-Cousins BVRI colors (corrected)
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Note on ubvri_k.dat, ubvri_c.dat: synthetic bolometric correction and UBVRI
colours from Kurucz model atmospheres (1992IAUS..149..225K 1992IAUS..149..225K) are in the
file "ubvri_k.dat", while the file "ubvri_c.dat" contains an
empirically corrected version from Lejeune, Cuisinier & Buser
(1997A&AS..125..229L 1997A&AS..125..229L)
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See also:
J/A+AS/125/229 : A standard stellar library (Lejeune+ 1997)
J/A+AS/130/65 : A standard stellar library. II. (Lejeune+ 1998)
VI/102 : Geneva stellar evolution tracks and isochrones (Lejeune+, 2001)
VI/54 : Horizontal Branch Stellar Model Calculations (Dorman 1992)
VI/65 : Evolutionary models of evolved stars (Dorman+ 1993)
VI/96 : Evolutionary Sequences (Fagotto+ 1993-96)
VI/113 : Evolutionary models of Population II stars (Cariulo+, 2004)
VI/118 : Stellar Models until He burning (Claret+ 1995-1998)
Byte-by-byte Description (# are comments) of file: ubvri_*.dat
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Bytes Format Units Label Explanations
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1- 5 F5.2 [Sun] [Fe/H] Metallicity
7- 11 I5 K Teff Effective temperature
13- 17 F5.2 [cm/s2] log.g Surface gravity
19- 24 F6.3 mag BC(V) Bolometric correction
26- 31 F6.3 mag U-B Johnson color index U-B
33- 38 F6.3 mag B-V Johnson color index B-V
40- 45 F6.3 mag V-R Johnson-Cousins color index V-R
47- 52 F6.3 mag R-I Cousins color index R-I
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Byte-by-byte Description (6 heading lines) of file: evgrid/ZAMS*
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Bytes Format Units Label Explanations
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1- 3 I3 --- Mod Model number (see paper)
6- 12 F7.4 solMass M Star mass
15- 20 F6.4 [K] log.Te Effective temperature
22- 28 F7.4 [solLum] log.L Star Luminosity
30- 36 F7.4 [solRad] log.R Star radius
38- 43 F6.4 --- k2 Dimensionless moment of inertia I/(MR2)
45- 50 F6.4 [T] Tc Core temperature
52- 57 F6.4 [g/cm3] Dc Core density
59- 64 F6.5 --- H1.c Core mass fraction of Hydrogen (1H)
66- 71 F6.5 --- He4.c Core mass fraction of Helium (4He)
73- 78 F6.5 --- C12.c Core mass fraction of Carbon (12C)
80- 85 F6.5 --- N14.c Core mass fraction of Nitrogen (14N)
87- 92 F6.5 --- O16.c Core mass fraction of Oxygen (16O)
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Byte-by-byte Description of file: summary.dat
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Bytes Format Units Label Explanations
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1 A1 --- O [OS] Standard or Overshooting model
2- 7 F6.4 --- Z Initial metallicity (1)
9- 15 F7.4 solMass Mass Star mass (no mass loss taken into account)
17- 19 I3 --- Mod "Model" (evolution) number (see paper)
21 A1 --- n_Mod [A-Z] Critical phase of evolution (2)
23- 26 I4 --- fMod Final model number
28- 42 E15.9 yr Age Star age
45- 50 F6.4 [K] log.Te Effective temperature at Age
52- 58 F7.4 [solLum] log.L Star Luminosity at Age
60- 66 F7.4 [solRad] log.R Star radius at Age
68- 74 F7.4 [solMass] Mc.He Helium core mass
76- 82 F7.4 [solMass] Mc.CO Carbon/Oxygen core mass
84- 89 F6.4 --- k2 Dimensionless moment of inertia I/(MR2)
91- 96 F6.4 [T] Tc Core temperature
98-103 F6.4 [g/cm3] Dc Core density
105-110 F6.5 --- H1.c Core mass fraction of Hydrogen (1H)
112-117 F6.5 --- He4.c Core mass fraction of Helium (4He)
119-124 F6.5 --- C12.c Core mass fraction of Carbon (12C)
126-131 F6.5 --- N14.c Core mass fraction of Nitrogen (14N)
133-138 F6.5 --- O16.c Core mass fraction of Oxygen (16O)
140-145 F6.5 --- H1.s Shell mass fraction of Hydrogen (1H)
147-152 F6.5 --- He4.s Shell mass fraction of Helium (4He)
154-159 F6.5 --- C12.s Shell mass fraction of Carbon (12C)
161-166 F6.5 --- N14.s Shell mass fraction of Nitrogen (14N)
168-173 F6.5 --- O16.s Shell mass fraction of Oxygen (16O)
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Note (1): values are 0.0001, 0.0003, 0.001, 0.004, 0.01, 0.02 or 0.03
Note (2): 19 phases are defined, from A (Zero-age main sequence) to Z
(final: e.g. C is the terminal age main sequence, H is the He
ignition, W is the C ignition (see paper, table2)
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(End) Francois Ochsenbein [CDS] 24-Mar-2009