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J/MNRAS/306/361     UBVI CCD photometry of M35 (NGC 2168)    (Sung+ 1999)
UBVI CCD photometry of M 35 (NGC 2168).
    Sung H., Bessell M.S.
   <Mon. Not. R. Astron. Soc. 306, 361 (1999)>
   =1999MNRAS.306..361S
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI


Abstract:
    UBVI CCD photometry has been obtained for the intermediate-age open
    cluster M35 (NGC 2168). From this new photometry we derived the
    cluster parameters (Vo-MV= 9.60±0.10 mag, E(B-V) = 0.255±0.024
    mag), age (logAge=8.3±0.3) and a photometric abundance (Z∼0.008,
    i.e. [Fe/H]~-0.3) from comparison with theoretical isochrones of the
    Padova group. A minimum binary frequency (35±5%) was estimated from
    the distribution of distance moduli of unevolved proper motion
    members. Faint photometric members were selected by using differences
    in the reddening effect on colour indices.

Description:
    BVI CCD photometry was performed for the central region of M35 on 1997
    November 23 at Siding Spring Observatory with the 40-inch telescope
    (f/8) and a thinned SITe 2048×2048 CCD (24-mm pixels). The scale was
    0.602 arcsec/pixel, giving 20.5arcmin on a side. Two sets of exposure
    times were used in the observations: long exposures 60s in I, 150s in
    V, 300s in B, 600s in U; short exposures: 5s in I and V, 7s in B and
    15s in U. The seeing was between 1.4 and 2.1arcsec.
Objects:
    ----------------------------------------------
      RA (2000) DE     Designation(s)
    ----------------------------------------------
    06 08 56 +24 21.6  M35 = NGC 2168 = C 0605+243
    ----------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       102     1150   CCD photometry in M35


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

   Bytes Format Units   Label     Explanations

   3-  6  I4    ---     Seq       [1,1150]+ Running number
                                    (Cl* NGC 2168 SB Seq in Simbad)
   8- 14  F7.3  arcmin  oRA       RA Distance to HD 41940
  16- 22  F7.3  arcmin  oDE       DE Distance to HD 41940
  24- 29  F6.3  mag     Vmag      V magnitude (Johnson)
  31- 36  F6.3  mag     V-I       V-I Cousins color index
  38- 43  F6.3  mag     B-V       B-V Johnson color index
  45- 50  F6.3  mag     U-B       U-B Johnson color index
  53- 57  F5.3  mag     e_Vmag    Photometric standard error on Vmag
  59- 63  F5.3  mag     e_V-I     V-I Photometric standard error  on V-I
  65- 69  F5.3  mag     e_B-V     B-V Photometric standard error on B-V
  71- 75  F5.3  mag     e_U-B     U-B Photometric standard error on U-B
      78  I1    ---     o_Vmag    Number of independent detections
      80  I1    ---     o_V-I     Number of independent detections
      82  I1    ---     o_B-V     Number of independent detections
      84  I1    ---     o_U-B     Number of independent detections
  87- 89  I3    ---     M+S       ? ID number used by McNamara & Sekiguchi
                                    (1986AJ.....91..557M)
      90  A1    ---     m_M+S     Multiplicity index on M&S
  91- 94  F4.2  ---     PrPM      [0,1]? proper motion membership probability
  96- 98  F3.1  ---     TClass    ? Temperature class (0=O, 1=B, 2=A, etc)
 100-102  F3.1  ---     LClass    ? Luminosity class (V=5.0, III=3.0)


Acknowledgements:
    
(End)    Hwankyung Sung [Seoul Univ.]   Francois Ochsenbein [CDS]    20-May-2001