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J/AZh/72/495   Moving Star Clusters in the Solar Neighborhood  (Orlov+, 1995)
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Moving Star Clusters in the Solar Neighborhood
     Orlov V.V., Panchenko I.E., Rastorguev A.S., Yatsevich A.V.
    <Astron. Zh. 72, 495 (1995)>
    =1995AZh....72..495O
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ADC_Keywords: Associations, stellar ; Space velocities

Description:
    Two cluster analysis algorithms - the principal stars method and the
    hierarchical clustering method - are used to identify moving star
    clusters in a sample of 1947 single and multiple stars in the nearby
    solar neighborhood with known space velocities from the Gliese and
    Jahreiss (Cat. <V/70>) catalog. Five rich moving clusters containing
    from 35 to 40 stars with velocities differing by not more than 6 km/s
    from the centroid value have been reliably identified. In addition,
    seven poor clusters have been identified with less confidence. Rich
    moving clusters include about 10% of all stars with known space
    velocities.

Table 1: Summary on data for 12 moving clusters identified using
        the principal stars algorithm
------------------------------------------------------------------------
     N   <U>     <V>     <W>       K
         km/s   km/s   km/s
------------------------------------------------------------------------
     1  +13.5   +2.8   -8.5       35
     2  -14.2  -21.7  -10.2       35
     3  -18.3   -9.0   -2.7       33
     4  -31.0  -12.1  -11.5       32
     5  -30.1  -11.5   +1.4       28
     6  +14.8  -14.1  -15.4       16
     7  -36.4  -27.5   -9.8       14
     8  +17.6  -30.9   -0.3       10
     9   -8.2  -33.4   -0.5        9
    10  -38.1  -18.9   +7.5        9
    11  +11.5  -21.9  -22.3        8
    12   -1.9  -30.3   -6.5        8
------------------------------------------------------------------

Table 2: List of rich moving clusters identified by the
         hierarchical clustering method
--------------------------------------------------------------
       No.    <U>   <V>     <W>  K   c
             km/s   km/s   km/s      km/s
--------------------------------------------------------------
      1     -40.5  -17.5   -3.4  31  6
      2     +13.5   +3.4   -7.4  29  6
      3     -12.5  -19.0   -9.0  25  6
      4     -21.5   -9.3   -4.2  21  6
      5     -14.7   -8.6   -0.1  20  6
      6     -34.7  -15.7  -10.3  18  6
      7     -28.7  -13.1   -8.1  18  6
      8     -16.7  -23.7  -10.7  18  6
      9      +6.2   -2.3    0.0  34  8
     10     -29.9  -11.8   +2.1  31  8
--------------------------------------------------------------

Table 3: Nearby open cluster data
----------------------------------------------------------
   N   Name     OCL    U      V      W     R     Age
                     km/s   km/s   km/s   pc   10^+7^yrs
----------------------------------------------------------
   1  Pleiades  421   -6.2  -23.7  -13.4  125     5
   2  Hyades    456  -43.1  -17.2   -4.2   43    80
   3  Praesepe  501  -37.8  -21.0   -7.6  160    70
   4  IC 2391   767  -18.1  -13.4   -6.1  150     3
   5  IC 2602   838   -1.8  -26.4   -0.1  150     1
   6  Coma      558   -1.6   -7.4   -0.8   80    40
   7  a Per     392  -12.6  -22.0   -2.4  180     4
   8  UMa       252  +14.2   -0.4  -11.8   20    50
   9  Cr 399    113   -9.9  -30.7   -3.0  120    30
----------------------------------------------------------

File Summary:
--------------------------------------------------------------------------------
  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
table4.dat         59       31   List of stars in the Hyades moving cluster
table5.dat         63       42   List of stars in moving cluster no. 1
table6.dat         63       37   List of stars in moving cluster no. 2
table7.dat         63       39   List of stars in moving cluster no. 3
table8.dat         63       43   List of stars in moving cluster no. 4
table9.dat         63       32   List of stars in moving cluster no. 5
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Byte-by-byte Description of file: table*.dat
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   Bytes Format  Units   Label    Explanations
--------------------------------------------------------------------------------
   1-  2  I2     ---       N      Running number
   5- 15  A11    ---       Ident  Star name from Gliese & Jahreiss (Cat. <V/70>)
                                   catalog
  17- 18  I2     h         RAh    Right ascension (1950)
  20- 21  I2     min       RAm    Right ascension (1950)
  23- 24  I2     s         RAs    Right ascension (1950)
      27  A1     ---       DE-    Declination sign
  28- 29  I2     deg       DEd    Declination (1950)
  31- 34  F4.1   arcmin    DEm    Declination (1950)
  36- 39  I4     0.1mas    plx    Resulting parallax
  42- 44  I3     0.1mas  e_plx    Error of parallax
  47- 49  I3     km/s      U      ? Space velocity component, U
  52- 54  I3     km/s      V      ? Space velocity component, V
  57- 59  I3     km/s      W      ? Space velocity component, W
  62- 63  I2     ---       k      ? Number of satellites in velocity space
                                    (U, V, W) for each star (Not in table4)
--------------------------------------------------------------------------------
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(End)                           Veta Avedisova [INASAN]             10-June-1997