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J/other/BASI/32.295    CCD UBVRI photometry of 3 open clusters  (Sujatha+, 2004)
UBVRI CCD photometric studies of open clusters
Berkeley 15, Czernik 18 and NGC 2401.
    Sujatha S., Babu G.S.D., Ananthamurthy S.
   <Bull. Astron. Soc. India, 32, 295-309 (2004)>
   =2004BASI...32..295S
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI

Keywords: Open clusters - distances - ages


Abstract:
    CCD photometric observations of three open clusters Berkeley 15
    (= OCl 414), Czernik 18 (= OCl 426) and NGC 2401 (= OCl 588), obtained
    for the first time in UBVRI filters down to V=20mag, are presented
    here. They are located at distances of 1259, 955 and 3467 parsecs with
    their respective ages estimated as ∼5x109years, ∼0.8 to 1x109years
    and ∼1x109years. While OCl 414 and OCl 426 are in the direction of
    the Auriga - Perseus constellations, OCl 588 is placed in the
    direction of Ophiuchus constellation in our Galaxy. The clusters
    studied here are of intermediate and old age category.

Description:
    The clusters were observed on 13 and 14 December 2001, with the 1.02m
    telescope at the Vainu-Bappu Observatory of Indian Institute of
    Astrophysics at Kavalur. Standard UBVRI filters along with 1k CCD were
    used at the Cassegrain focus of the telescope, the image scale being
    0.315arcsec/pixel. The well-known open cluster M67 (NGC 2682) was also
    observed on each of the above-mentioned dates for the calibration of
    the instrument.
Objects:
    -----------------------------------------------------------
       RA  (2000)  DE     Designation(s)          (tables)
    -----------------------------------------------------------
    05 02 05   +44 30 00  Berkeley 15 = OCl 414   (table3.dat)
    04 28 00   +30 56 00  Czernik 18  = OCl 426   (table4.dat)
    07 29 24   -13 58 00  NGC 2401    = OCl 588   (table5.dat)
    -----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        60      110   Standardised UBVRI photometric data for individual
                              stars in the open cluster Berkeley 15 (OCl 414)
table4.dat        61       89   Standardised UBVRI photometric data for individual
                              stars in the open cluster Czernik 18 (OCl 426)
table5.dat        60      146   Standardised UBVRI photometric data for individual
                              stars in the open cluster NGC 2401 (OCl 588)


Byte-by-byte Description of file: table?.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     SBA       Sequential number (1)
   5- 11  F7.3  pix     Xpos      X position (2)
  13- 19  F7.3  pix     Ypos      Y position (2)
  21- 26  F6.3  mag     Vmag      Johnson V magnitude
  28- 33  F6.3  mag     U-B       ?=- Johnson U-B colour index
  35- 40  F6.3  mag     B-V       Johnson B-V colour index
  42- 47  F6.3  mag     V-R       Johnson V-R colour index
  49- 53  F5.3  mag     V-I       Johnson V-I colour index
  55- 60  F6.3  mag     B-I       Johnson B-I colour index

Note (1): Simbad designations:
      Cl* Berkeley 15 SBA NNN for table 3
      Cl* Czernik 18 SBA NN   for table 4
      Cl* NGC 2401 SBA NNN    for table 5
Note (2): North is towards the top and east is towards the left. 1 pix=0.315".



History:
    From electronic version of the journal at ADS
(End)                                      Patricia Vannier [CDS]    24-Oct-2005