J/A+A/508/355 Scaled solar tracks and isochrones (Bertelli+, 2009)
Scaled solar tracks and isochrones in a large region of the Z-Y plane.
II. From 2.5 to 20M☉ stars.
Bertelli G., Nasi E., Girardi L., Marigo P.
<Astron. Astrophys., 508, 355-369 (2009)>
=2009A&A...508..355B 2009A&A...508..355B
ADC_Keywords: Models, evolutionary ; Magnitudes ; Abundances
Keywords: stars: evolution - Cepheids
Abstract:
We extend our theoretical computations for low-mass stars to
intermediate-mass and massive stars, for which few databases exist in
the literature. Evolutionary tracks and isochrones are computed for
initial masses 2.50-20M☉ for a grid of 37 chemical compositions
with metal content Z between 0.0001 and 0.070 and helium content Y
between 0.23 and 0.40 to enable users to obtain isochrones for ages as
young as about 107 years and to simulate stellar populations with
different helium-to-metal enrichment laws. The Padova stellar
evolution code is identical to that used in the first paper of this
series. Synthetic TP-AGB models allow stellar tracks and isochrones to
be extended until the end of the thermal pulses along the AGB. We
provide software tools for the bidimensional interpolation (in Y and
Z) of the isochrones from very old ages down to about 107 years. This
lower limit depends on chemical composition. The extension of the blue
loops and the instability strip of Cepheid stars are compared and the
Cepheid mass-discrepancy is discussed. The location of red supergiants
in the H-R diagram is in good agreement with the evolutionary tracks
for masses from 10 to 20M☉. Tracks and isochrones are available
in tabular form for the adopted grid of chemical compositions in the
extended plane Z-Y in three photometric systems. An interactive web
interface allows users to obtain isochrones of any chemical
composition inside the provided Z-Y range and also to simulate stellar
populations with different Y(Z) helium-to-metal enrichment laws.
Description:
Evolutionary tracks and Isochrones in the Johnson-Cousins UBVRIJHK
system for the compositions:
Z=0.0001 (Y=0.23, 0.26, 0.30, 0.40)
Z=0.0004 (Y=0.23, 0.26, 0.30, 0.40)
Z=0.001 (Y=0.23, 0.26, 0.30, 0.40)
Z=0.002 (Y=0.23, 0.26, 0.30, 0.40)
Z=0.004 (Y=0.23, 0.26, 0.30, 0.40)
Z=0.008 (Y=0.23, 0.26, 0.30, 0.34, 0.40)
Z=0.017 (Y=0.23, 0.26, 0.30, 0.34, 0.40)
Z=0.040 (Y= 0.26, 0.30, 0.34, 0.40, 0.46)
Z=0.070 (Y= 0.30, 0.34, 0.40, 0.46)
The evolutionary tracks include those presented in Paper I (Bertelli
et al. 2008A&A...484..815B 2008A&A...484..815B); the masses of the models cover the range
0.6 to 20M☉.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 82 9 Combinations of Z and Y of the computed tracks
iso/* . 39 Isochrone tables
tracks.dat 81 1276 Stellar tracks list
agb/* . 912 *Stellar tracks for AGB, M=0.55 to M=2.50
hb/* . 571 *Stellar tracks for horizontal branch,
M=0.55 to M=2.50
ms/* . 1160 *Stellar tracks for main sequence, M=0.55 to M=20.
--------------------------------------------------------------------------------
Note on agb/* hb/* ms/*: Filenames in the form zZZZZyYY_m.mm.dat,
where ZZZZ is the initial metallicity Z*104,
YY is the initial helium abundance Y*102 and
m.mm is the initial mass.
--------------------------------------------------------------------------------
See also:
VI/96 : Evolutionary Sequences (Fagotto+ 1993-96)
J/A+AS/106/275 : Theoretical isochrones (Bertelli+ 1994)
J/A+AS/141/371 : Low-mass star evolutionary tracks & isochrones (Girardi+ 2000)
J/MNRAS/387/105 : Isochrone database for single+binary-star SSPs (Li+, 2008)
http://stev.oapd.inaf.it/YZVAR : Complete data-base Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 --- Z [0.0001/0.070] Initial metallicity (G1)
8- 19 A12 --- Y23 Filename for Y=0.23 in iso subdirectory
21- 32 A12 --- Y26 Filename for Y=0.26 in iso subdirectory
34- 45 A12 --- Y30 Filename for Y=0.30 in iso subdirectory
47- 57 A11 --- Y34 Filename for Y=0.34 in iso subdirectory
59- 70 A12 --- Y40 Filename for Y=0.40 in iso subdirectory
72- 82 A11 --- Y46 Filename for Y=0.46 in iso subdirectory
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Byte-by-byte Description of file (1 headline): iso/*
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Bytes Format Units Label Explanations
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3- 9 F7.4 [yr] logAge Age
12- 18 F7.4 [solLum] logL Surface luminosity
22- 27 F6.4 [K] logTe Effective temperature
30- 36 F7.4 [cm/s2] logG Surface gravity
40- 45 F6.4 solMass Mi Initial mass
49- 54 F6.4 solMass Mcur Actual stellar mass
56- 64 F9.6 --- FLUM Indefinite integral over the initial mass M of
the Salpeter initial mass function by number
67- 72 F6.3 mag UMAG Johnson U absolute magnitude
75- 80 F6.3 mag BMAG Johnson B absolute magnitude
83- 88 F6.3 mag VMAG Johnson V absolute magnitude
91- 96 F6.3 mag RMAG Cousins R absolute magnitude
99-104 F6.3 mag IMAG Cousins I absolute magnitude
107-112 F6.3 mag JMAG Johnson J absolute magnitude
115-120 F6.3 mag HMAG Johnson H absolute magnitude
123-128 F6.3 mag KMAG Johnson K absolute magnitude
132 I1 --- CP [0/2] Index marking the presence of a
characteristic point, when different from zero
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Byte-by-byte Description of file: tracks.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.4 --- Z [0.0001/0.070] Initial metallicity (G1)
8- 11 F4.2 --- Y [0.23/0.46] Initial helium abundance (G2)
13- 17 F5.2 solMass Mass [0.49/20.0] Initial Mass
19- 38 A20 --- MS Filename of Main Sequence tracks
40- 59 A20 --- HB Filename of Horizontal Branch tracks
61- 81 A21 --- AGB Filename of Asymptotic Giant Branch tracks
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Byte-by-byte Description of file (#): agb/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- N Sequential number
5- 16 E12.7 yr Age Age
18- 23 F6.4 [solLum] logL Total luminosity
25- 30 F6.4 [K] logTeff Effective temperature
32- 37 F6.4 solMass Mact Actual stellar mass
39- 44 F6.4 solMass Mcore Core mass
46- 51 F6.3 --- C/O Surface C/O ratio
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Byte-by-byte Description of file (#): hb/* ms/*
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- N Sequential number
4- 16 E13.8 yr Age Age
17- 23 F7.4 [solLum] logL Total luminosity
25- 30 F6.4 [K] logTeff Effective temperature
31- 37 F7.4 [cm/s2] logG Surface gravity
39- 45 F7.4 [K] logTc Central temperature
47- 52 F6.4 [-] logrho Central density
54- 59 F6.4 --- Xc Central X abundance
61- 66 F6.4 --- Yc Central Y abundances
68- 73 F6.4 --- XcC Central abundance of 12C
75- 80 F6.4 --- XcO Central abundance of 16O
82- 86 F5.3 --- Qconv Fractionary mass of the convective core
88- 92 F5.3 --- Qdisc Fractionary mass of the first mesh point where
the chemical composition differs from the
surface value
94- 99 F6.3 [solLum] log(LH) Hydrogen luminosity
101-105 F5.3 --- Q1H Fractionary mass of the inner border of the
hydrogen rich region
107-111 F5.3 --- Q2H Fractionary mass of the outer border of the
H-burning region
112-117 F6.3 [solLum] log(LHe) Helium luminosity
119-123 F5.3 --- Q1He Fractionary mass of the inner border of the
He-burning region (when greater than zero
He-burning is in a shell)
125-129 F5.3 --- Q2He Fractionary mass of the upper border of the
He-burning region
131-135 F5.3 [solLum] log(LC) Carbon luminosity
137-141 F5.3 [solLum] log(Lnu) Neutrinos luminosity (absolute value)
143-147 F5.3 --- QTmax Fractionary mass of the point where the
temperature attains the maximum value
149-158 A10 --- Phase Particular evolutionary stages
(not explained; see J/A+AS/141/371)
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Global notes:
Note (G1): Initial metallicity values are:
0.0001, 0.0004, 0.001, 0.002, 0.004, 0.008, 0.017, 0.040, 0.070
Note (G2): Initial helium abundance are:
0.23, 0.26, 0.30, 0.34, 0.40, 0.46
--------------------------------------------------------------------------------
History:
* Copied at http://stev.oapd.inaf.it/YZVAR/
* 25-Apr-2010: Version including the high-mass stars, from
http://stev.oapd.inaf.it/YZVAR/
References:
Betelli et al., Paper I 2008A&A...484..815B 2008A&A...484..815B
(End) Patricia Vannier [CDS] 08-Feb-2010