J/A+AS/141/371 Low-mass stars evolutionary tracks & isochrones (Girardi+, 2000)
Evolutionary tracks and isochrones for low- and intermediate-mass stars:
From 0.15 to 7 M☉, and from Z=0.0004 to 0.03.
Girardi L., Bressan A., Bertelli G., Chiosi C.
<Astron. Astrophys. Suppl. Ser. 141, 371 (2000)>
=2000A&AS..141..371G 2000A&AS..141..371G
ADC_Keywords: Models, evolutionary ; Photometry, UBVRIJKLMNH ; Abundances ;
Effective temperatures
Mission_Name:
Keywords: stars: evolution - stars: interiors -
stars: Hertzsprung-Russell (HR) diagram - stars: low-mass
Description:
These files contain a large database of stellar models that are
suitable to modelling star clusters and galaxies by means of
population synthesis. They are based on a large grid of stellar
evolutionary tracks for the initial chemical compositions [Z=0.0004,
Y=0.23], [Z=0.001, Y=0.23], [Z=0.004, Y=0.24], [Z=0.008, Y=0.25],
[Z=0.019, Y=0.273] (solar composition), and [Z=0.03, Y=0.30]. Tracks
are computed with updated opacities and equation of state, and a
moderate amount of convective overshoot. The range of initial masses
goes from 0.15M☉ to 7M☉, and the evolutionary phases
extend from the zero age main sequence (ZAMS) till either the
thermally pulsing AGB regime or carbon ignition. We also present an
additional set of models with solar composition, computed using the
classical Schwarzschild's criterion for convective boundaries. From
all these models, we derive: (1) Tables with the main quantities that
characterize the stellar structure along the evolutionary tracks; (2)
tables of surface chemical composition after the first and second
dredge-up events; (3) extended theoretical isochrones in the
Johnson-Cousins UBVRIJHK broad-band photometric system, together with
summary tables; (4) integrated colours of single-burst stellar
populations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
mstracks.dat 173 13723 Evolutionary tracks main sequence from ZAMS on
hbtracks.dat 173 4311 Evolutionary tracks horizontal branch from ZAHB
surfcomp.dat 105 208 Surface chemical compositions
isochron.dat 142 64381 Isochrones
isochsum.dat 94 4251 Isochrones, summary table
sspcolor.dat 80 350 Integrated Jonhson-Cousins broad-band colours
of single-burst stellar populations (SSP)
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See also:
http://pleiadi.pd.astro.it : Padova database of stellar evolutionary tracks
and isochrones
J/A+AS/100/647 : Evolutionary Sequences II. (Bressan+ 1993)
J/A+AS/104/365 : Evolutionary sequences III. (Fagotto+ 1994)
J/A+AS/105/29 : Evolutionary sequences IV. (Fagotto+ 1994)
J/A+AS/105/39 : Evolutionary sequences V. (Fagotto+ 1994)
J/A+AS/117/113 : Evolutionary sequences VI. (Girardi+ 1996)
J/A+AS/106/275 : Theoretical isochrones (Bertelli+ 1994)
J/A+A/361/1023 : α-enhanced stars evolutionary
tracks & isochrones (Salasnich+, 2000)
Byte-by-byte Description of file: mstracks.dat hbtracks.dat
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Bytes Format Units Label Explanations
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1 I1 --- Overshoot [0/1] 0: models without overshooting
1: models with overshooting
3- 6 F4.2 solMass Mass Initial star mass
8- 13 F6.4 --- Z Initial metallicity
15- 19 F5.3 --- Y Initial helium abundance
21- 31 E11.5 yr Age Stellar age
33- 38 F6.3 [solLum] logL logarithm of surface luminosity
41- 45 F5.3 [K] logTeff logarithm of effective temperature
47- 52 F6.3 [cm/s2] logg logarithm of surface gravity (in cgs units)
55- 59 F5.3 [K] logTc logarithm of central temperature
62- 66 F5.3 [g/cm3] logrho logarithm of central density (in cgs units)
69- 73 F5.3 --- XcYc Mass fraction of either hydrogen (up to the
central H-exhaustion) or helium (later
stages) in the stellar centre
75- 81 E7.2 --- XcC Mass fraction of carbon in the stellar centre
83- 89 E7.2 --- XcO Mass fraction of oxygen in the stellar centre
91- 96 F6.4 --- Qconv Fractional mass of the convective core
98-103 F6.4 --- Qdisc Fractional mass of the first mesh point where
the chemical composition differs from the
surface value
105-110 F6.3 [solLum] logLH logarithm of the total luminosity provided by
H-burning reactions
112-117 F6.4 --- Q1H Fractionary mass of the inner boundary of the
H-rich region
119-124 F6.4 --- Q2H Fractionary mass of the outer boundary of the
H-burning region
126-131 F6.3 [solLum] logLHe logarithm of the total luminosity provided by
He-burning reactions (2)
133-138 F6.4 --- Q1He Fractionary mass of the inner boundary of the
He-burning region
140-145 F6.4 --- Q2He Fractionary mass of the outer boundary of the
He-burning region
148-152 F5.3 [solLum] logLC logarithm of the total luminosity provided by
C-burning reactions (2)
154-159 F6.3 [solLum] logLnu logarithm of the total luminosity lost by
neutrinos (2)
162-167 F6.4 --- QTmax Fractionary mass of the point with the highest
temperature inside the star
170-173 A4 --- Stage Label indicating particular evolutionary
stages (see the paper for details) (G1)
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Note (2): a null value indicates negligible energy generation by those reactions
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Byte-by-byte Description of file: surfcomp.dat
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Bytes Format Units Label Explanations
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1 I1 --- Overshoot [0/1] 0: models without overshooting
1: models with overshooting
3- 8 F6.4 --- Zini Initial metallicity
10- 14 F5.3 --- Yini Initial helium abundance
16 A1 --- Stage [1a2] Stage : a: all
1: first dredge-up
2: second dredge-up
18- 21 F4.2 solMass Mass ? Mass (undefined for all stage)
23- 27 F5.3 --- H Mass fraction of H
29- 36 E8.2 --- 3He Mass fraction of 3He
38- 42 F5.3 --- 4He Mass fraction of 4He
44- 51 E8.2 --- 12C Mass fraction of 12C
53- 60 E8.2 --- 13C Mass fraction of 13C
62- 69 E8.2 --- 14N Mass fraction of 14N
71- 78 E8.2 --- 15N Mass fraction of 15N
80- 87 E8.2 --- 16O Mass fraction of 16O
89- 96 E8.2 --- 17O Mass fraction of 17O
98-105 E8.2 --- 18O Mass fraction of 18O
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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 I1 --- Overshoot [0/1] 0: models without overshooting
1: models with overshooting
3- 9 F7.5 --- Z Exact metallicity value of the isochrone
11- 19 E9.3 yr age Exact age value of the isochrone
21- 25 F5.2 [yr] log(age) logarithm of age
27- 36 F10.8 solMass Mini Initial mass of the star
38- 43 F6.4 solMass Mact Actual mass of the star, i.e., the mass
obtained considering the previous history of
mass-loss
45- 51 F7.4 [solLum] logL logarithm of surface luminosity
53- 58 F6.4 [K] logTeff logarithm of effective temperature
60- 66 F7.4 [cm/s2] logg logarithm of surface gravity
68- 73 F6.3 mag Mbol Absolute bolometric magnitude
75- 80 F6.3 mag UMAG Absolute magnitude in Johnson U pass-band
82- 87 F6.3 mag BMAG Absolute magnitude in Johnson B pass-band
89- 94 F6.3 mag VMAG Absolute magnitude in Johnson V pass-band
96-101 F6.3 mag RMAG Absolute magnitude in Cousins R pass-band
103-108 F6.3 mag IMAG Absolute magnitude in Cousins I pass-band
110-115 F6.3 mag JMAG Absolute magnitude in Johnson J pass-band
117-122 F6.3 mag HMAG Absolute magnitude in Johnson H pass-band
124-130 F7.3 mag KMAG Absolute magnitude in Johnson K pass-band
132-142 F11.8 --- FLUM Indefinite integral of the Salpeter IMF
by number (1)
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Note (1): For the case of the Salpeter IMF, φ(M)=AM^-α, with
α=2.35. When we assume a normalization constant of A=1, FLUM is
simply given by FLUM = M^1-α/(1-α.
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Byte-by-byte Description of file: isochsum.dat
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Bytes Format Units Label Explanations
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1 I1 --- Overshoot [0-1] 0: models without overshooting
1: models with overshooting
3- 9 F7.5 --- Z Exact metallicity value of the isochrone
11- 19 E9.3 yr age Exact age value of the isochrone
21- 25 F5.2 [yr] log(age) logarithm of age
27- 32 F6.4 solMass Mini Initial mass of the star
34- 38 F5.3 solMass Mact Actual mass of the star, i.e., the mass
obtained considering the previous history of
mass-loss
40- 44 F5.3 [solLum] logL logarithm of surface luminosity
46- 50 F5.3 [K] logTeff logarithm of effective temperature
52- 56 F5.2 [cm/s2] logg logarithm of surface gravity
58- 63 F6.3 mag VMAG Absolute magnitude in the V pass-band
65- 70 F6.3 mag U-B U-B colour index (Johnson)
72- 77 F6.3 mag B-V B-V colour index (Johnson)
79- 84 F6.3 mag V-I V-I colour index (Cousins)
86- 89 A4 --- Stage Stage along the isochrone (G1)
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Byte-by-byte Description of file: sspcolor.dat
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Bytes Format Units Label Explanations
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1 I1 --- Overshoot [0/1] 0: models without overshooting
1: models with overshooting
3- 8 F6.4 --- Zini Initial metalicity
10- 14 F5.3 --- Yini Helium initial abundance
16- 23 E8.2 yr Age Age
25- 29 F5.3 mag VMAG Absolute V magnitude
31- 36 F6.3 mag B-V B-V colour index (Johnson)
38- 43 F6.3 mag U-B U-B colour index (Johnson)
45- 50 F6.3 mag BC Bolometric correction
52- 56 F5.3 mag V-R V-R colour index (Cousins)
58- 62 F5.3 mag V-I V-I colour index (Cousins)
64- 68 F5.3 mag V-J V-J colour index (Johnson)
70- 74 F5.3 mag V-H V-H colour index (Johnson)
76- 80 F5.3 mag V-K V-K colour index (Johnson)
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Global notes:
Note (G1): Particular evolutionary stages:
ZAMS: initial evolutionary stage
ZAHB: initial evolutionary stage
Te-M: local maxima of Teff
Te-m: local minima of Teff
L-M: local maxima of L
L-m: local minima of L
Xc=0: exhaustion of central hydrogen
Yc=0: exhaustion of central helium
Bhe: highest Teff during the He-burning of intermediate-mass star
LpT: lowest L during the He-burning of intermediate-mass star
Brg: base of the first ascent of the red giant branch
Tip: tip of the first ascent of the red giant branch
1tp: maximum L immediately preceding a thermal pulse
1TP: beginning of the thermally pulsing AGB phase
Cb: stage of C-ignition in the cases the AGB phase do not occur
AGBt: end of AGB phase
BHeb: begin of the core helium burning phase
EHeb: end of the core helium burning phase
RGBb: base of the RGB
RGBt: tip of RGB phase
TO: turn-off point, i.e. the point of highest Teff during
the core-H burning phase
F: Final model
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Acknowledgements: Leo Girardi
History:
An updated version of this database, containing extensions
and a lot of additional data, is being kept at the URL
http://pleiadi.pd.astro.it
(End) Patricia Bauer [CDS] 28-Nov-2000