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J/A+A/379/136     UBVRI photometry of 3 young open clusters     (Carraro+, 2001)
Star clusters in the Carina complex: UBVRI photometry of NGC 3114, Collinder 228
and vdB-Hagen 99.
    Carraro G., Patat F.
   <Astron. Astrophys. 379, 136 (2001)>
   =2001A&A...379..136C
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI

Keywords: stars: evolution - stars: general -
          stars: Hertzsprung-Russel (HR) and C-M diagrams -
          open clusters and associations: individual: NGC 3114 -
          open clusters and associations: individual: Collinder 228 -
          open clusters and associations: individual: vdB-Hagen 99

Abstract:
    In this paper we present and analyze CCD UBVRI photometry in the region
    of the three young open clusters NGC 3114, Collinder 228, and
    vdB-Hagen 99, located in the Carina spiral feature. NGC 3114 lies in
    the outskirts of the Carina nebula. We found 7 star members in a
    severely contaminated field, and obtain a distance of 950pc and an
    age less than 3x108yrs. Collinder 228 is a younger cluster
    (8x106yrs), located in front of the Carina nebula complex, for which
    we identify 11 new members and suggest that 30% of the stars are
    probably binaries. As for vdB-Hagen 99, we add 4 new members,
    confirming that it is a nearby cluster located at 500pc from the Sun
    and projected toward the direction of the Carina spiral arm.
    Observations were conducted at La Silla on April 13-16, 1996,
    with the 0.92m ESO-Dutch telescope.
Objects:
    -----------------------------------------
       RA   (2000)   DE       Designation(s)
    -----------------------------------------
    10 02 42.7   -60 06 32.1  NGC 3114
    10 43 01.3   -60 00 44.8  Collinder 228
    10 37 54.2   -59 11 47.1  vdB-Hagen 99
    -----------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
ngc3114.dat      102     2060   Photometry of NGC 3114
coll228.dat      102     1112   Photometry of Collinder 228
vdbh99.dat       102      898   Photometry of VdB-Hagen 99
tables.dat        77       21   Photometry of the stars in the field of the open
                             clusters in common with other works
                             (tables 3, 5 and 7 of the paper)


Byte-by-byte Description of file: ngc3114.dat coll228.dat vdbh99.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     ID        Identification number in the cluster
   6- 13  F8.3  pix     Xpos      X coordinates (1)
  15- 22  F8.3  pix     Ypos      Y coordinates (1)
  24- 30  F7.4  mag     Umag      ?=99.99 U band magnitude
  32- 38  F7.4  mag     e_Umag    ?=99.99 Error in Umag
  40- 46  F7.4  mag     Bmag      ?=99.99 B band magnitude
  48- 54  F7.4  mag     e_Bmag    ?=99.99 Error in Bmag
  56- 62  F7.4  mag     Vmag      ?=99.99 V band magnitude
  64- 70  F7.4  mag     e_Vmag    ?=99.99 Error in Vmag
  72- 78  F7.4  mag     Rmag      ?=99.99 R band magnitude
  80- 86  F7.4  mag     e_Rmag    ?=99.99 Error in Rmag
  88- 94  F7.4  mag     Imag      ?=99.99 I band magnitude
  96-102  F7.4  mag     e_Imag    ?=99.99 Error in Imag

Note (1): The positions are accurate to 1 pixel.
           1 pix = 0.44 arcsec. North is up and East is left
   Coordinates of the centers:
     NGC 3114      (0.0, 300.0); RA=10 02 42.7 (2000) DE=-60 06 32.1
     Collinder 228 (0.0, 300.0); RA=10 43 01.3 (2000) DE=-60 00 44.8
     VdB-Hagen 99  (0.0,   0.0); RA=10 37 54.2 (2000) DE=-59 11 47.1


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

   Bytes Format Units   Label     Explanations

   1-  8  A8    ---     Cluster   Cluster name (NGC 3114, Col 228 or VdBH 99)
  10- 11  I2    ---     ID        Star number in the cluster
  13- 24  A12   ---     Oname     Other name (1)
  26- 34  A9    ---     HD        HD name
  36- 41  F6.3  mag     Vmag      Present study V magnitude
  43- 47  F5.3  mag     (B-V)     Present study (B-V) colour index
  49- 54  F6.3  mag     (U-B)     ? Present study (U-B) colour index
  57- 62  F6.3  mag     Vmag2     Other study V magnitude
  63- 68  F6.3  mag     (B-V)2    Other study (B-V) colour index
  70- 75  F6.3  mag     (U-B)2    ? Other study (U-B) colour index
      77  A1    ---     r_Vmag2   Reference for Vmagl, (B-V)l and (U-B)l (2)

Note (1): Other names:
     JM NNN = NGC 3114 NN, for Jankowitz & McCosh (1963MNSSA..22...18J) list
     FMF NN = Cl Collinder 228 NN in Simbad
Note (2): References for Vmag2, (B-V)2 and (U-B)2:
     3: Jankowitz & McCosh, 1963MNSSA..22...18J
     5: Feinstein et al., 1976A&AS...24..389F
     7: Landolt et al., 1990AJ....100..695L


Acknowledgements: Giovanni Carraro 


References:
   Patat & Carraro, Bochum 9, 10 and 11,    2001MNRAS.325.1591P
   Carraro et al.,  NGC 3324 and Loden 165, 2001A&A...371..107C
(End)                                        Patricia Bauer [CDS]    05-Nov-2001