V/19 Masses and Ages of Stars in 68 Open Clusters (Piskunov 1980)
Catalog of Masses and Ages of Stars in 68 Open Clusters
Piskunov A.
=1980BICDS..19...67P 1980BICDS..19...67P
ADC_Keywords: Clusters, open ; Stars, ages ; Stars, masses
Description:
This catalog contains the evolutionary masses and ages of about 7000
stars in 68 open clusters, as derived from their positions in the
theoretical HR diagram. Cluster ages range from 106 to some 109
years, and their population varies from 30 to 700 members. For each
cluster we have a table with ages and masses of stars. The file,
clusters.dat may include for each cluster, the name (or NGC/IC
number), cluster class, assumed color index E(B-V), true distance
modulus (V-MV)0, evolutionary tracks used for given cluster and
reference to the source of UBV data. The data in data.dat consists of
star serial number, color index, V magnitude, luminosity, effective
temperature, and ages and masses of stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
data.dat 68 9879 Data for individual stars
clusters.dat 120 68 General information on each cluster
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Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Cl [1/68]+= Cluster number (see clusters.dat)
4- 6 I3 --- N *Running number within each cluster
10-14 I5 --- ID Star number in UBV source
18-22 F5.3 mag B-V B-V color index
24-29 F6.3 mag Vmag V magnitude
31-32 I2 --- LC Adopted luminosity class
35-39 F5.3 [K] log.Teff Logarithm of effective temperature
41-45 F5.2 [solLum] logL Logarithm of luminosity
48-56 E9.3 yr Age *?=0 Age of the star
58-63 F6.2 solMass Mass ?=0 Mass of the star
66-68 I3 % Prob [0/100] Probability of Age and Mass
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Note on Age:
For stars lying under the ZAMS or to the right of the Hayashi limit,
ages are formally defined and are negative, but have no physical
meaning. Some stars lie in the forbidden regions of the H-R diagram
due to errors of photometry, of conversion procedure, etc. To these
stars, reasonable values of age and mass cannot be attributed. In this
case, zeros appear in the Age, Mass and Prob fields.
Note on N: stars are ordered by absolute magnitudes.
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Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Cl [1/68]+= Cluster number (as in data.dat)
5- 8 F4.2 mag E(B-V) Colour excess
10- 14 F5.2 mag m-M *True distance modulus
16 A1 --- Model *[IP] Evolutionary tracks used
18- 36 A19 --- ClName Name of cluster
39-120 A82 --- Ref Reference text
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Note on m-M: the distance, in parsecs, is: 10(m-M+5)
Note on Model:
I = Iben I., 1965-67: ApJ 141, 993; 142, 1447; 143, 483; 143, 505;
143, 516; 147, 624; 147, 650
P = Paczinski B., 1970, Acta Astron. 20, 47.
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Historical notes:
* 11-Feb-1997: clusters.dat data file reshaped at CDS
(End) Julie Anne Watko [SSDOO/ADC] 08-Jan-1997