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J/PAZh/33/643       Kinematics of Sco-Cen OB Association     (Bobylev+, 2007)
Kinematics of the Scorpius-Centaurus OB association.
     Bobylev V.V., Bajkova A.T.
    <Pis'ma Astron. Zh. 33, 643 (2007)>
    =2007PAZh...33..643B
    =2007AstL...33..571B
ADC_Keywords: Associations, stellar; Proper motions; Radial velocities;
              Space velocities; Magnitudes

Abstract:
    A fine structure related to the kinematic peculiarities of three
    components of the Scorpius-Centaurus association (LCC = Lower
    Centaurus-Crux, UCL = Upper Centaurus-Lupus, and US = Upper Scorpius)
    has been revealed in the UV-velocity distribution of Gould Belt stars.
    We have been able to identify the most likely members of these groups
    by applying the method of analyzing the two-dimensional probability
    density function of stellar UV velocities that we developed. A
    kinematic analysis of the identified structural components has shown
    that, in general, the center-of-mass motion of the LCC, UCL, and US
    groups follows the motion characteristic of the Gould Belt, notably
    its expansion. The entire Scorpius-Centaurus complex is shown to
    possess a proper expansion with an angular velocity parameter of
    46±8km/s/kpc for the kinematic center with l0=-40° and
    R0=110pc found. Based on this velocity, we have estimated the
    characteristic expansion time of the complex to be 21±4Myr. The
    proper rotation velocity of the Scorpius-Centaurus complex is lower in
    magnitude, is determined less reliably, and depends markedly on the
    data quality.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       207      255   Gould Belt stars with parallax errors < 20%


See also:
        I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
        I/259 : The Tycho-2 Catalogue (Hog+ 2000)
      III/213 : General Cat. of mean radial velocities (Barbier-Brossat+, 2000)
      III/252 : Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)
 J/AZh/83/821 : Compiled stellar radial velocities cat. (OSACA) (Bobylev+, 2006)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units    Label    Explanations

   1-  3  A3    ---      ---      [HIP]
   5- 10  I6    ---      HIP      HIP number (1)
  12- 21  A10   ---      Name     Name of cluster or association,
                                   in some cases, common name of the star (2)
  23- 28  F6.1  km/s     RV       Mean radial velocity
  31- 34  F4.1  km/s     e_RV     Standard error in RV if available
      36  I1    ---      n_RV     Number of catalogues for calculation of RV
  38- 47  A10   ---      r_RV     ? Source of RV (3)
  49- 52  F4.2  ---      P(LCC)   Membership probability of LCC (Lower Cen-Cru)
  54- 57  F4.2  ---      P(UCL)   Membership probability of UCL (Upper Cen-Lup)
  59- 62  F4.2  ---      P(US)    Membership probability of US  (Upper Sco)
  64- 67  F4.2  ---     P(Gould)  Membership probability of Gould's Belt
  69- 80  F12.8 deg      RAdeg    Right ascension in decimal degrees (J2000)
  82- 93  F12.8 deg      DEdeg    Declination in decimal degrees (J2000)
  95-100  F6.2  mas      plx      Hipparcos parallax
 102-105  F4.2  mas      e_plx    ? Error of parallax
 107-114  F8.2  mas/yr   pmRA     Proper motion in RA, mu(alpha)*cos(delta)
 116-123  F8.2  mas/yr   pmDE     Proper motion in DE
 125-130  F6.2  mag      Vmag     Johnson V magnitude
 132-137  F6.1  km/s     UVel     Space velocity component on galactic X axis
 138-143  F6.1  km/s     VVel     Space velocity component on galactic Y axis
 144-149  F6.1  km/s     WVel     Space velocity component on galactic Z axis
 151-155  F5.1  km/s     e_UVel   ? Standard error of UVel if e_RV available (4)
 156-160  F5.1  km/s     e_VVel   ? Standard error of VVel if e_RV available (4)
 161-165  F5.1  km/s     e_WVel   ? Standard error of WVel if e_RV available (4)
 167-171  F5.2  mas/yr   e_pmRA   Error of proper motion in pmRA
 173-177  F5.2  mas/yr   e_pmDE   Error of proper motion in pmDE
 179-185  F7.3  mag      BTmag    ?=99.999 Tycho BT magnitude
 187-193  F7.3  mag      VTmag    ?=99.999 Tycho VT magnitude
 195-200  F6.3  mag      e_BTmag  ?=9.999 Error of Tycho BT magnitude
 202-207  F6.3  mag      e_VTmag  ?=9.999 Error of Tycho VT magnitude

Note (1):
     Catalogue number of the star in the Hipparcos Catalogue (ESA 1997,
     The Hipparcos and Tycho Catalogues, ESA SP-1200, Cat. I/239)
Note (2):
     gLCC and gUCL represent the list of E.J. de Geus,  P.T. de Zeeuw and
     J. Lub (1989A&A...216...44D)
Note (3): Source of RV as follows:
     PCRV       = Gontcharov (2006AstL...32..759, Cat. III/252),
                  http://www.geocities.com/orionspiral/
     Jilinski   = Jilinski et al. (2006A&A...216..44)
     P+Jil      = this work
     Makarov    = Makarov (2003AJ...126..1996)
     Wichmann   = Wichmann et al. (2003A&A...399..983)
     Song       = Song et al. (2003ApJ...599..342)
     Torres     = Torres et al. (2006, Cat. J/A+A/460/695)
     Barb-Figon = Barbier-Brossat and Figon, Cat. III/213
     Montes     = Montes et al.(2001, Cat. J/MNRAS/328/45)
     Sartory    = Sartory et al. (2003, Cat. J/A+A/404/913)
     Mamajek    = Mamajek (2005ApJ...634..1385)
     OSACA      = Bobylev et al. (2006, Cat. J/AZh/83/821),
                  http://www.geocities.com/orionspiral/
Note (4):
     For TWA 1,4,9,11 was adopted e_PAR/PAR=0.2.

(End)                  Veta Avedisova (INASAN)                       21-Jan-2008