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VI/40 Revised Yale Isochrones and Luminosity Functions (Green+ 1987)
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The Revised Yale Isochrones and Luminosity Functions
Green E.M., Demarque P., King C.R.
<Yale University Observatory, New Haven, Connecticut (1987)>
=1987ryil.book.....G
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ADC_Keywords: Models, evolutionary; Isochrones; Stars, ages
Description:
The revised isochrones and luminosity functions (LFs) are based on
the stellar evolution calculations of Mengel et al. (1979) and
Sweigart and Gross (1978). The revised tables comprise the most
complete (as of 1987) isochrone grid available in both age and
composition. The improvement in the revised catalog is the inclusion
of UBVRI data as well as the theoretical quantities, which are
empirically matched to a wide range of observational UBVRI data (Green
et al. 1987, unpublished). These tables enable users to interpolate
between isochrones, to plot isochrones in order to fit color-magnitude
diagrams, luminosity functions to compare with observational data, and
to construct stellar population models.
To facilitate the use of isochrones, we (at the Astronomical Data Center,
in 1987) had made available several FORTRAN programs, ISOTRP, LF, and
subroutines. They incorporate our experience of the best methods of
interpolation, minimization of precision problems, and how to deal with
compositions and ages that are not always complete. ISOTRP allows the
user to interpolate for any helium abundance or metallicity in the range
of the Revised Yale Isochrone tables. LF constructs customized
differential luminosity functions for Mbol or a UBVRI magnitude, for any
bin size, and for any initial mass functions.
In addition to the 24 isochrone files and the FORTRAN programs, we (at
ADC) have included the color table that was used to convert from [Fe/H],
log Teff, and log g to BC, U-B, B-V, V-R, R-I, in the isochrone data
files. The data cover a complete grid with [Fe/H] from 1.00 to -3.5 in
steps of 0.50, Teff from 2800 to 20000 K, and log g from 0.00 to 6.00.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
header.dat 23 644 The isochrone header file
isoc5112.dat 125 2347 The isochrones for Z=1E-1 and Y=0.20
isoc5113.dat 125 2429 The isochrones for Z=1E-1 and Y=0.30
isoc5121.dat 125 3073 The isochrones for Z=1E-2 and Y=0.10
isoc5122.dat 125 4645 The isochrones for Z=1E-2 and Y=0.20
isoc5123.dat 125 4414 The isochrones for Z=1E-2 and Y=0.30
isoc5124.dat 125 3937 The isochrones for Z=1E-2 and Y=0.40
isoc5131.dat 125 2439 The isochrones for Z=1E-3 and Y=0.10
isoc5132.dat 125 3929 The isochrones for Z=1E-3 and Y=0.20
isoc5133.dat 125 3929 The isochrones for Z=1E-3 and Y=0.30
isoc5134.dat 125 2293 The isochrones for Z=1E-3 and Y=0.40
isoc5141.dat 125 2389 The isochrones for Z=1E-4 and Y=0.10
isoc5142.dat 125 4181 The isochrones for Z=1E-4 and Y=0.20
isoc5143.dat 125 4006 The isochrones for Z=1E-4 and Y=0.30
isoc5144.dat 125 2192 The isochrones for Z=1E-4 and Y=0.40
isoc5151.dat 125 2430 The isochrones for Z=1E-5 and Y=0.10
isoc5152.dat 125 3434 The isochrones for Z=1E-5 and Y=0.20
isoc5153.dat 125 4009 The isochrones for Z=1E-5 and Y=0.30
isoc5154.dat 125 2182 The isochrones for Z=1E-5 and Y=0.40
isoc5422.dat 125 4090 The isochrones for Z=4E-2 and Y=0.20
isoc5423.dat 125 4436 The isochrones for Z=4E-2 and Y=0.30
isoc5432.dat 125 4196 The isochrones for Z=4E-3 and Y=0.20
isoc5433.dat 125 3319 The isochrones for Z=4E-3 and Y=0.30
isoc5442.dat 125 4211 The isochrones for Z=4E-4 and Y=0.20
isoc5443.dat 125 3809 The isochrones for Z=4E-4 and Y=0.30
colortbl.dat 53 3510 Color Table
isotrp.for 80 435 *ISOTRP.FOR
lf.for 80 473 *LF.FOR
lsq.for 80 286 *LSQ.FOR
parrot.for 80 262 *PARROT.FOR
suave.for 80 68 *SUAVE.FOR
upcase.for 80 20 *UPCASE.FOR
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Note on *.for:
The ADC does not support these programs. They are included "as is".
No guarantee is given by the ADC or NASA for the usefulness or
reliability of these programs.
Data file summary information:
Each isochrone file contains a number of isochrones featured by their
ages and Evolutionary status (IGB).
The information in the header.dat file summarizes the file specific
information taken from the data files. The Name of the files was
changed from the original format remaining in header.dat by removing
the period and adding ".dat".
Byte-by-byte Description of file: header.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Isochrone filename
11- 13 I3 --- IGB *Evolutionary status
15- 17 I3 --- Num Number of points for this isochrone
19- 23 F5.2 --- Alpha *Mixing length to scale height ratio
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Note on IGB:
0 indicates Main Sequence (MS) turnoff only
-1 means Red Giant branch (RGB) included
Note on Alpha:
Effective convective mixing length to pressure scale height ratio,
always 1.50.
Byte-by-byte Description of file: isoc*.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- EEP Equivalent evolutionary point number
4 A1 --- Mflag *[* ] Mass data flag
5- 10 I6 Myr AGE The age in units of 10^6 yrs
11- 12 I2 % Y Helium abundance
13- 16 I4 10-5 Z *Metal abundance
17- 25 F9.6 solMass Mass Mass
26- 35 F10.7 K Teff Effective temperature
36- 45 F10.7 solLum Lumin Luminosity
46- 60 E15.9 --- DN1 *Initial mass function 1
61- 75 E15.9 --- DN2 *Initial mass function 2
76- 90 E15.9 --- DN3 *Initial mass function 3
91- 97 F7.3 mag V *Visual magnitude
98-104 F7.3 mag U-B *Photoelectric U-B colors
105-111 F7.3 mag B-V *Photoelectric B-V colors
112-118 F7.3 mag V-R *Photoelectric V-R colors
119-125 F7.3 mag R-I *Photoelectric R-I colors
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Note on Mflag:
"*" if the mass point was extrapolated or it was interpolated over a very
large interval.
Note on Z:
Metal abundance. The only exceptions are that Z = 0000 then Z is 1 and
if Z = 9999 then Z is 10000 (in units of 1E-5)
Note on DN1, DN2, DN3:
The number of stars between J and J+1, for three different MS initial mass
functions, s=1+x=0, 2.35, and 4.00, where dN(m) =~ m^(-s). The constant
s was chosen to normalize all dN to 1000 stars in the range 0.5 < m < 1.0
solar masses on the initial MS.
Note on V, U-B, B-V, V-R, R-I:
UBVRI magnitude and colors; Johnson UBV and Cousins RI.
About the isochrone files:
Each isochrone file contains isochrones for a single composition.
The first 2 numbers of the file extension indicate Z, and the
third number indicates Y for that file. For example iso123.dat
contains data for Z=1x10^(-2), Y=0.30; iso432.dat pertains to
Z=4x10-3, Y=0.20, etc. Zsun has been defined to be 0.02. Each
isochrone file has a Zero Age Main Sequence (ZAMS) plus as many
of the following ages as could be interpolated (or reasonably
extrapolated) from the Mengel et al. (1979) and Sweigart
and Gross (1978) mass tracks (units are 10 yrs):
150, 200, 350, 500, 750, 1000, 1500, 2000,
3000, 4000, 5000, 6000, 7000, 8000, 9000,
10000, 11000, 12000, 13000, 14000, 15000,
16000, 17000, 18000, 20000, 22000, 25000.
The data files include the following compositions and ages:
Z Y MS-turnoff ages Age range with
Giant-Branches
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0.00001 0.10 0, 200 - 25000 none
0.20 0, 200 - 25000 11000 - 25000
0.30 0, 150 - 25000 6000 - 25000
0.40 0, 150 - 18000 none
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0.0001 0.10 0, 200 - 25000 none
0.20 0, 200 - 25000 3000 - 25000
0.30 0, 150 - 25000 6000 - 25000
0.40 0, 200 - 18000 none
------------------------------------------------------------
0.0004 0.20 0, 200 - 25000 3000 - 25000
0.30 0, 150 - 25000 6000 - 20000
------------------------------------------------------------
0.001 0.10 0, 200 - 25000 none
0.20 0, 200 - 25000 6000 - 25000
0.30 0, 150 - 25000 7000 - 25000
0.40 0, 150 - 18000 none
------------------------------------------------------------
0.004 0.20 0, 200 - 25000 3000 - 22000
0.30 0, 150 - 17000 6000 - 17000
------------------------------------------------------------
0.01 0.10 0, 200 - 25000 15000 - 25000
0.20 0, 150 - 2500 750 - 25000
0.30 0, 150 - 20000 500 - 20000
0.40 0, 150 - 20000 3000 - 20000
------------------------------------------------------------
0.04 0.20 0, 150 - 22000 3000 - 22000
0.30 0, 150 - 25000 1500 - 25000
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0.1 0.20 0, 150 - 22000 none
0.30 0, 150 - 25000 none
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Byte-by-byte Description of file: colortbl.dat
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Bytes Format Units Label Explanations
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1- 5 F5.2 --- FeHratio The abundance ratio of Fe and H
7- 12 F6.0 K Teff Gas effective temperature
15- 18 F4.2 cm/s2 Log(g) Log of gravity
19- 25 F7.3 mag BC Bolometric Corrections
26- 32 F7.3 mag U-B Photoelectric U-B colors
33- 39 F7.3 mag B-V Photoelectric B-V colors
40- 46 F7.3 mag V-R Photoelectric V-R colors
47- 53 F7.3 mag R-I Photoelectric R-I colors
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About the color table:
This color table is not called by the provided programs: ISOTRP or LF. It
was used originally to derive the observational quantities in the 24 data
files, and is included for reference only. The basic description of the
color calibration for the isochrones is in "Calibration of Stellar Ages",
ed. A. G. Davis Philip, p.81 (1988). The data cover a complete grid with
[Fe/H] from 1.00 to -3.5 in steps of 0.50, Teff from 2800 K to 20000 K,
and log g from 0.00 to 6.00. Note the first two records which were the
filename and labels of individual data field were removed.
The FORTRAN programs included:
The purpose (contents) of each individual FORTRAN code:
ISOTRP.FOR - isochrone interpolation program for Y and Z; also used
to calculate different values for the initial mass function exponent.
LF.FOR - program to construct differential luminosity functions.
UBVRI.CAL - the color table that was used to convert from [Fe/H], log
Teff, and log g to BC, U-B, B-V, V-R, R-I, in the isochrone data files.
The file was renamed colortbl.dat in the present catalog.
PARROT.FOR, SUAVE.FOR, LSQ.FOR, UPCASE.FOR - subroutines used by
ISOTRP and LF.
Acknowledgements:
The original introductory text of "The Revised Yale Isochrones and
Luminosity Functions" by Green et al. (1987) and its attached letter of
Wayne H. Warren were used to create this ReadMe file. The author
provided the color calibration reference.
References:
Ciardullo, R.B., and Demarque, P. 1978, Trans. Yale. Obs., vols 33-35.
Davis Philip, A.G., ed. (1988). Calibration of Stellar Ages
Kurucz, R.L. 1979, Ap J. Suppl., 40, 1
Mengel, J.G., Sweigart, A.V., Demarque, P., and Gross, P.G. 1979, Ap J.
Suppl., 40, 733
Sweigart, A.V., and Gross, P.G. 1978, Ap J. Suppl., 36, 405.
VandenBerg, D.A., and Bell, R.A. 1985, Ap.J. Suppl., 58, 561.
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(End) C.-H. Joseph Lyu; Paul Kuin [Hughes STX/NASA] 12-July-1996