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J/A+A/333/897       Mass segregation in open clusters (Raboud+ 1998)
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Evolution of mass segregation in open clusters: some observational evidences
       Raboud D., Mermilliod J.-C.
      <Astron. Astrophys. 333, 897 (1998)>
      =1998A&A...333..897R      (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open ; Photometry ; Stars, distances ; Stars, masses
Keywords: clusters: open - individual: Praesepe, NGC 6231 - star: formation

Abstract:
    On the basis of the best available member list and duplicity
    information, we have studied the radial structure of Praesepe and of
    the very young open cluster NGC 6231. We have found mass segregation
    among the cluster members and between binaries and single stars, which
    is explained by the greater average mass of the multiple systems.
    However, the degree of mass segregation for stars between 1.5 and
    2.3M_{sun}_ is less pronounced in Praesepe than in the Pleiades.
    Furthermore, mass segregation is already present in the very young
    open cluster NGC 6231 although this cluster is likely still not
    dynamically relaxed. We discuss the implications of these results and
    propose a qualitative scenario for the evolution of mass segregation
    in open clusters.
    In Praesepe the mass function of single stars and primaries appears to
    be significantly different, like in the Pleiades. We observe an
    absence of ellipticity of the outer part of Praesepe.

Objects:
    ----------------------------------------------------------
      RA  (2000)  DE    Designation(s)
    ----------------------------------------------------------
    08 40.4    +19 40   Praesepe = NGC 2632 = M 44
    16 54.2    -41 48   NGC 6231
    ----------------------------------------------------------

File Summary:
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 FileName     Lrecl  Records  Explanations
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ReadMe          80        .   This file
table2.dat      74      185   Member stars in Praesepe
table3.dat      82      300   Member stars in NGC 6231
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See also:
   J/A+A/325/167 : Geneva photometry in NGC 6231 (Raboud+ 1997)

Byte-by-byte Description of file: table2.dat
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   Bytes Format Units        Label     Explanations
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   1-  4  I4    ---          KW        Star identification
                                        (Cl* NGC 2632 KW NNN in Simbad database)
   7- 11  F5.2  mag          Vmag      V magnitude
  14- 17  F4.2  mag          B-V       B-V colour index
  20- 26  F7.2  arcmin       xpos      x coordinate (1)
  29- 35  F7.2  arcmin       ypos      y coordinate (1)
  37- 42  F6.2  arcmin       Dist      Distance from the cluster center
      44  I1    ---          Mult      Multiplicity status
  46- 54  A9    ---          Rem       Remarks
  56- 59  F4.2  solMass      MassTot   Total mass
  61- 64  F4.2  solMass      MassA     Component A mass
  66- 69  F4.2  solMass      MassB     ? Component B mass
  71- 74  F4.2  solMass      MassC     ? Component C mass
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Note (1): Origin (1950.0), RA = 08 37 32 ; DE = +19 48.8
           y increasing to North , x to East
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Byte-by-byte Description of file: table3.dat
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   Bytes Format Units        Label     Explanations
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   1-  4  I4    ---          NGC6231   Star identification
                                        (NGC 6231 NNN in Simbad database)
   7- 11  F5.2  mag          Vmag      V magnitude
  14- 18  F5.2  mag          col       Colour ((B-V)J, (B_V)G or b-y) (1)
  21- 24  A4    ---          phot      Photometry used (Gen, UBV or uvby)
  28- 33  F6.2  arcmin       xpos      x coordinate (2)
  37- 42  F6.2  arcmin       ypos      y coordinate (2)
  46- 50  F5.2  arcmin       Dist      Distance from the cluster center
      53  I1    ---          Mult      Multiplicity status
  56- 62  A7    ---          Rem       Remarks
  65- 69  F5.2  solMass      MassTot   Total mass
  72- 76  F5.2  solMass      MassA     ? Component A mass
  78- 82  F5.2  solMass      MassB     ? Component B mass
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Note (1): The colour is
          (B-V)_Johnson if the photometry used (phot column) is UBV,
          (B-V)_Geneva if the photometry used is Gen
          and (b-y) if the photometry used is uvby.
Note (2): Origin (1950.0) RA = 16 50 41 ; DE =-41 44.9
            y increasing to North , x to East
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Acknowledgements: Didier Raboud <Didier.Raboud@obs.unige.ch>
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(End)               Raboud [Geneva Observatory]                      20-Feb-1998