J/A+A/375/863                Photometry in NGC 2516            (Jeffries+, 2001)
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Photometry and membership for low mass stars in the young open cluster NGC 2516
    Jeffries R.D., Thurston M.R., Hambly N.C.
      <Astron. Astrophys. 375, 863 (2001)>
      =2001A&A...375..863J      (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open ; Photometry
Keywords: open clusters and associations: individual: NGC 2516 -
         stars: mass function, luminosity function - binaries: general

Abstract:
    We present the results of a 0.86 square degree CCD photometric survey
    of the open cluster NGC 2516, which has an age of about 150Myr and may
    have a much lower metallicity than the similarly-aged Pleiades. Our
    BVI_c_ survey of cluster members is complete to V~20 and is used to
    select a preliminary catalogue of 1254 low mass (0.<M<2.0M_{sun}_)
    cluster candidates, of which about 70-80 percent are expected to be
    genuine. After applying corrections for contamination by non-members
    and adding data for higher mass stars from the literature, we
    investigate the cluster binarity, luminosity and mass function, mass
    segregation and total mass. We find a binary fraction of 26+/-5%, for
    A to M-type systems with mass ratios between 0.6 and 1, which is very
    similar to the Pleiades.

File Summary:
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  FileName   Lrecl  Records   Explanations
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ReadMe          80        .   This file
table3.dat      73   15495    The photometric catalogue for NGC 2516
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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-  5  I5    ---     ID        Star number
   8-  9  I2    h       RAh       Right ascension (J2000)
  11- 12  I2    min     RAm       Right ascension (J2000)
  14- 19  F6.3  s       RAs       Right ascension (J2000)
      22  A1    ---     DE-       Declination sign
  23- 24  I2    deg     DEd       Declination (J2000)
  26- 27  I2    arcmin  DEm       Declination (J2000)
  29- 33  F5.2  arcsec  DEs       Declination (J2000)
  36- 41  F6.3  ---     Vmag      V magnitude
  44- 49  F6.3  ---     B-V       ?=-9.999 B-V colour index (1)
  52- 57  F6.3  ---     V-I       ?=-9.999 V-I (Cousins) colour index (1)
  60- 61  I2    ---     F1        [-1/1] V vs B-V membership flag (2)
  63- 64  I2    ---     F2        [-1/1] V vs V-I membership flag (2)
  66- 67  I2    ---     F3        [-1/1] B-V vs V-I membership flag (2)
  69- 70  I2    ---     F4        [-1/1] Candidate membership flag (3)
      73  I1    ---     F5        [0/1] Binarity flag (4)
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Note (1): A value of -9.999 indicates that the value is unavailable for this
           star.
Note (2): Refers to the tests outlined in Sect. 3.3.
           Flag is set to
             1 if the star passes the test,
            -1 if it fails or
            0 if there is insufficient information to apply the test.
Note (3): A star is flagged with a
           1 if it is a candidate member because it has not failed either of the
              three membership tests, or is flagged with a
           -1 if it has failed one or more of the tests and is classed as a
               non-member.
Note (4): A candidate member (see note 2) is flagged with a
           1 if it is a potential unresolved binary system, or
           0 otherwise.
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Acknowledgements: Rob Jeffries <rdj@astro.keele.ac.uk>

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(End)                                        Patricia Bauer [CDS]    27-Aug-2001