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V/19                Masses and Ages of Stars in 68 Open Clusters (Piskunov 1980)
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Catalog of Masses and Ages of Stars in 68 Open Clusters
     Piskunov A.
    <CDS Bull. No. 19, p. 67 (1980)>
    =1980BICDS..19...67P
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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 10^6^ to some 10^9^
    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-M_V)_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
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(End)                                  Julie Anne Watko [SSDOO/ADC]  08-Jan-1997