VI/113 Evolutionary models of Population II stars (Cariulo+, 2004)
Stellar evolutionary models of Population II stars.
Cariulo P., Castellani V., Degl'Innocenti S.
<Astron. Astrophys. 421, 1121 (2004)>
=2004A&A...421.1121C 2004A&A...421.1121C
ADC_Keywords: Models, evolutionary ; Stars, population II
Keywords: stars: evolution - globular clusters: general -
open clusters and associations: general
Description:
The models are calculated for different chemical compositions both
without overshooting (standard models, including microscopic diffusion
of He and heavy elements) and with different overshooting efficiency.
Each set of models can be found in a different sub-directory. It is
possible to get all the content for each chemical composition, the
content of each selected sub-directory or just a given file. In each
directory there are evolutionary tracks (TRACKS), isochrones
(ISOCHRONES), horizontal branch models together with a table of the
ZAHB characteristics (HB) and files with some relevant physical values
of selected models (STRUCTURES).
Models with overshooting are calculated for masses higher than
1M☉ to avoid the unobserved presence of the overall contraction
feature in 1M☉ stars. Thus isochrones for ages higher than about
5Gyr are the same as in the standard case and thus are not included
in the overshooting directories. Models with overshooting does not
include microscopic diffusion because for masses higher than about
1M☉ the effect of this mechanism is almost negligible.
Models with overshooting are calculated for masses higher than
1M☉ to avoid the unobserved presence of the overall contraction
feature in 1M☉ stars. Thus isochrones for ages higher than about
5Gyr are the same as in the standard case and thus are not included in
the overshooting directories. Models with overshooting does not
include microscopic diffusion because for masses higher than about
1M☉ the effect of this mechanism is almost negligible.
All the tracks and isochrones have been transformed in the observation
plane by adopting the model atmospheres by Castelli
(1999A&A...346..564C 1999A&A...346..564C), see also Castelli, Gratton & Kurucz
(1997A&A...318..841C 1997A&A...318..841C).
For convenience, all tracks and isochrones have been grouped in
4 tables tracks.dat, struct.dat, hb.dat and isochron.dat
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
strfiles.dat 81 30 List of files with structure parameters
trkfiles.dat 81 194 List of files with evolutionary tracks
isofiles.dat 81 457 List of files with isochrones
hbfiles.dat 82 91 List of files with evolutionary tracks in
Horizontal Branch (He-burning)
models/* . 8 Subdirectory tree containing the sets of models
struct.dat 164 129789 *Structure (physical) parameters
tracks.dat 136 191618 *Evolutionary tracks
hb.dat 136 111706 *Evolutionary tracks in Horizontal Branch stage
isochron.dat 136 463086 *Isochrone parameters
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Note on struct.dat, tracks.dat, hb.dat, isochron.dat:
the files include blank lines which separate the results
concerning one set of parameters.
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See also:
http://astro.df.unipi.it/SAA/PEL/Z0.html : Pisa Evolutionary Library
VI/96 : Evolutionary Sequences (Fagotto+ 1993-96)
J/A+AS/96/269 : Grids of stellar models I (Schaller+, 1992)
J/A+AS/98/523 : Grids of stellar models II (Schaerer+ 1993)
J/A+AS/101/415 : Grids of stellar models III (Charbonnel+ 1993)
J/A+AS/102/339 : Grids of stellar models IV (Schaerer+, 1993)
J/A+AS/103/97 : Grids of stellar models V (Meynet+ 1994)
J/A+AS/115/339 : Grids of stellar models VI (Charbonnel+, 1996)
J/A+AS/128/471 : Grids of stellar models VII (Mowlavi+ 1998)
J/A+AS/135/405 : Grids of stellar models VIII (Charbonnel+ 1999)
Byte-by-byte Description of file: trkfiles.dat strfiles.dat
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Bytes Format Units Label Explanations
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1- 44 A44 --- File Name of model file, in "models" subdirectory
47- 52 F6.4 --- Z Initial metallicity
56- 60 F5.3 --- Y Initial He abundance
64- 66 F3.1 --- alpha Ratio mixing length / pressure scale height
70- 74 F5.2 solMass Mo Initial mass (mass of progenitor)
76 A1 --- Diff [d] Model with diffusion
78- 81 F4.2 --- beta ? Ratio overshooting length / pressure height
(in models with overshooting)
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Byte-by-byte Description of file: hbfiles.dat
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Bytes Format Units Label Explanations
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1- 44 A44 --- File Name of model file, in "models" subdirectory
47- 52 F6.4 --- Z Initial metallicity
56- 60 F5.3 --- Y Initial He abundance
64- 66 F3.1 --- alpha Ratio mixing length / pressure scale height
70- 74 F5.2 solMass Mo Initial mass (mass of progenitor)
76 A1 --- Diff [d] Model with diffusion
78- 82 F5.3 --- Mass ? Mass on the horizontal branch
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Byte-by-byte Description of file: isofiles.dat
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Bytes Format Units Label Explanations
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1- 44 A44 --- File Name of model file, in "models" subdirectory
47- 52 F6.4 --- Z Initial metallicity
56- 60 F5.3 --- Y Initial He abundance
64- 66 F3.1 --- alpha Ratio mixing length / pressure scale height
69- 74 F6.3 Gyr Age Isochrone's age
76 A1 --- Diff [d] Model with diffusion
78- 81 F4.2 --- beta ? Ratio overshooting length / pressure height
(in models with overshooting)
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Byte-by-byte Description of file: tracks.dat hb.dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 --- Z Initial metallicity
10- 14 F5.3 --- Y Initial He abundance
18- 20 F3.1 --- alpha Ratio mixing length / local pressure scale
height
24- 28 F5.2 solMass Mo Initial mass (mass of progenitor)
30 A1 --- Diff [d] Model with diffusion
32- 35 F4.2 --- beta ? Ratio overshooting length / pressure height
(in models with overshooting)
36 A1 --- PHS [PH] Pre-main-sequence/Horizontal-branch stage.
38- 48 F11.8 [yr] logt ? Age (does not always exist)
50- 57 F8.5 solMass Mass Mass
59- 66 F8.5 [solLum] logL Luminosity
70- 76 F7.5 [K] logTe Effective temperature
79- 86 F8.5 mag VMAG Absolute V magnitude
89- 96 F8.5 mag B-V B-V colour index
99-106 F8.5 mag U-B U-B colour index
109-116 F8.5 mag V-I V-I colour index
119-126 F8.5 mag V-R V-R colour index
129-136 F8.5 mag R-I R-I colour index
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Byte-by-byte Description of file: isochron.dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 --- Z Initial metallicity
10- 14 F5.3 --- Y Initial He abundance
18- 20 F3.1 --- alpha Ratio mixing length / pressure scale height
23- 28 F6.3 Gyr Age Age of isochrone
30 A1 --- Diff [d] Model with diffusion
32- 35 F4.2 --- beta ? Ratio overshooting length / pressure height
(in models with overshooting)
50- 57 F8.5 solMass Mass Mass
59- 66 F8.5 [solLum] logL Luminosity
70- 76 F7.5 [K] logTe Effective temperature
79- 86 F8.5 mag VMAG Absolute V magnitude
89- 96 F8.5 mag B-V B-V colour index
99-106 F8.5 mag U-B U-B colour index
109-116 F8.5 mag V-I V-I colour index
119-126 F8.5 mag V-R V-R colour index
129-136 F8.5 mag R-I R-I colour index
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Byte-by-byte Description of file: struct.dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 --- Z Initial metallicity
10- 14 F5.3 --- Y Initial He abundance
18- 20 F3.1 --- alpha Ratio mixing length / local pressure scale
height
24- 28 F5.2 solMass Mo Initial mass (mass of progenitor)
30 A1 --- Diff [d] Model with diffusion
32- 35 F4.2 --- beta ? Ratio overshooting length / pressure height
(in models with overshooting)
38- 48 F11.8 [yr] logt Age
50- 54 F5.3 --- H/He Central abundance of H/He
56- 63 F8.5 [solLum] logL Luminosity
66- 72 F7.5 [K] logTe Effective temperature
75- 81 F7.5 [K] logTc Central temperature
83- 90 F8.5 [g/cm3] logrhoc Central density
93- 99 F7.5 [K] logTmax Central maximum temperature
102-108 F7.5 --- MassTm Mass coordinate of the maximum in temperature
(M/Mtot)
111-117 F7.5 solMass MassCC Mass extension of the central convective
region
120-126 F7.5 solMass MassHeC Mass extension of the helium core
128-132 F5.3 --- MassCE Mass coordinate of the bottom of the
convective envelope (M/Mtot)
134-138 F5.3 --- L-pp Fraction of the luminosity of the
proton-proton chain over the total luminosity
140-144 F5.3 --- L-CNO Fraction of the luminosity of the CNO cycle
over the total luminosity
147-154 E8.3 --- L-He Fraction of the luminosity of the He burning
over the total luminosity
156-164 E9.3 --- L-Gra Fraction of the luminosity of the gravothermal
energy over the total luminosity
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Acknowledgements: Scilla Degl'Innocenti
References:
Castellani et al., Paper I 2003A&A...404..645C 2003A&A...404..645C
(End) Patricia Bauer [CDS] 23-Feb-2004