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J/MNRAS/353/1025    JHK photometry of 4 W51 star clusters    (Nanda+, 2004)
Embedded star clusters in the W51 giant molecular cloud.
    Nanda Kumar M.S., Kamath U.S., Davis C.J.
   <Mon. Not. R. Astron. Soc., 353, 1025-1034 (2004)>
   =2004MNRAS.353.1025N
ADC_Keywords: H II regions ; Molecular clouds ; Photometry, infrared

Keywords: turbulence - stars: formation - ISM: clouds - H II regions -
          ISM: individual: W51 GMC - infrared: stars

Abstract:
    We present sub-arcsecond (0.35-0.9"), near-infrared J-, H- and K-band
    photometric observations of six fields along the W51 giant molecular
    cloud (W51 GMC). Our observations reveal four new, embedded clusters
    and provide a new high-resolution (0.35") view of the W51 IRS2
    (G49.5-0.4) region. The cluster associated with G48.9-0.3 is found to
    be a double cluster enclosed in a nest of near-infrared nebulosity. We
    construct stellar surface density maps for four major clusters in the
    W51 GMC. These unveil the underlying hierarchical structure.

Description:
    NIR observations were made at the 3.8-m United Kingdom Infrared
    Telescope (UKIRT) with the facility imager UFTI. The UFTI pixel scale
    measures 0.091"; the available field of view is ∼90". Photometric
    observations through JHK broad-band filters were secured for six
    fields during three nights of service observing (2000 September 15,
    2001 May 31 and 2001 August 12).

Fields:
    -----------------------------------------
       RA   (2000)   DE      Designation(s)
    -----------------------------------------
    19 22 14     +14 03 09   G48.9-0.3
    19 22 26     +14 06 46   G49.0-0.3
    19 23 02     +14 16 41   G49.2-0.3
    19 23 40     +14 31 07   G49.5-0.4
    -----------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        70      502   Photometry for sources in the field G48.9-0.3
table3.dat        70      566   Photometry for sources in the field G49.0-0.3
table4.dat        70      272   Photometry for sources in the field G49.2-0.3
table5.dat        70      399   Photometry for sources in the field G49.5-0.4


Byte-by-byte Description of file: table2.dat table3.dat table4.dat table5.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    h       RAh       Right ascension (J2000)
   4-  5  I2    min     RAm       Right ascension (J2000)
   7- 12  F6.3  s       RAs       Right ascension (J2000)
      14  A1    ---     DE-       Declination sign (J2000)
  15- 16  I2    deg     DEd       Declination (J2000)
  18- 19  I2    arcmin  DEm       Declination (J2000)
  21- 25  F5.2  arcsec  DEs       Declination (J2000)
  28- 33  F6.3  mag     Kmag      K magnitude
  36- 40  F5.3  mag     e_Kmag    rms uncertainty on Kmag
  43- 48  F6.3  mag     Hmag      H magnitude
  51- 55  F5.3  mag     e_Hmag    rms uncertainty on Hmag
  58- 63  F6.3  mag     Jmag      J magnitude
  66- 70  F5.3  mag     e_Jmag    rms uncertainty on Jmag


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    21-Mar-2005