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J/ApJS/122/431      Star Clusters in M33                    (Chandar+, 1999)
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Star Clusters in M33. I. Detection, Morphology, and Photometry
       Chandar R., Bianchi L., Ford H. C.
      <Astrophys. J. Suppl. Ser. 122, 431 (1999)>
      =1999ApJS..122..431C      (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, globular; Clusters, open; Galaxies, nearby;
              Photometry, UBV; Photometry, ultraviolet
Mission_Name: HST
Keywords: galaxies: evolution - galaxies: individual (M33) - galaxies:
          star clusters

Abstract:
    In this paper we present the discovery of 60 star clusters in 20
    multiband Hubble Space Telescope (HST) WFPC2 fields in M33. The fields
    sample a variety of environments, from outer regions to spiral arms
    and central regions, as well as a range of galactocentric distances.
    The HST spatial resolution allowed us to penetrate the crowded, spiral
    arm regions of M33 yielding the first unbiased, representative sample
    of star clusters for this galaxy. We discuss the separation of
    clusters from stellar sources, and from other extended sources such as
    star-forming regions, H II regions, and supernova remnants. For the
    clusters we present multiband images and discuss morphology, location,
    and integrated photometry. Measured cluster colors and magnitudes are
    presented. The cluster density in our sample as a function of
    galactocentric distance yields an estimate of 690 total clusters in
    M33.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table2.dat        102       61   The M33 cluster sample
table3.dat        101       60   M33 star cluster photometry
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See also:
   J/other/AcA/48.455/ M31 + M33 globular clusters photometry (Mochejska+, 1998)

Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    ---     Seq       ? Cluster number (except for the nucleus)
   7- 13  A7    ---     Name      Cluster Identification
      15  I1    h       RAh       Right Ascension (J2000)
  17- 18  I2    min     RAm       Right Ascension (J2000)
  20- 25  F6.3  s       RAs       Right Ascension (J2000)
  27- 28  I2    deg     DEd       Declination (J2000)
  30- 31  I2    arcmin  DEm       Declination (J2000)
  33- 37  F5.2  arcsec  Des       Declination (J2000)
  44- 47  F4.2  kpc     GDist     ? Galactocentric distance
  54- 95  A42   ---     Morph     Morphology of cluster
 100-102  A3    ---     Loc       Location notes (1)
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Note (1):
    1 = On spiral arm
    2 = Off spiral arm
    1/2 = in between
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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-  2  I2    ---       Seq       Cluster number
   4- 10  A7    ---       Name      Cluster Identification
  11- 16  F6.3  mag       Vmag      V band magnitude within a 2.2'' radius
  18- 22  F5.3  mag     e_Vmag      Uncertainty in the V band
      23  A1    ---     n_Vmag      Flag on the V measurement (1)
  25- 27  F3.1  arcsec    Rad       ? Radius of the cluster
  29- 34  F6.3  mag       B-V       ? B-V color within Rad radii
  37- 41  F5.3  mag     e_B-V       ? Uncertainty in B-V
  43- 48  F6.3  mag       U-B       ? U-B color within Rad radii
  51- 55  F5.3  mag     e_U-B       ? Uncertainty in U-B
  58- 63  F6.3  mag       U-V       ? U-V color within Rad radii
  65- 69  F5.3  mag     e_U-V       ? Uncertainty in U-V
  72- 77  F6.3  mag       FUV       ? Far-Ultraviolet magnitude within Rad radii
  79- 83  F5.3  mag     e_FUV       ? Uncertainty in the Far-UV
      84  A1    ---     n_FUV       Flag on the Far-UV observations (2)
  86-105  A20   ---       Com       Comments
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Note (1): Cluster PM 4-1 has severe cosmic ray contamination within the 2.2''
    radius used for photometry. The cosmic ray DN were subtracted out manually,
    but this leaves residual errors. Hence, the error on the V
    magnitude for this cluster is larger than for the others.
Note (2): UV magnitude for this object measured in a 1.0'' radius
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History:
    From ApJ electronic edition

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(End)                            Greg Schwarz (AAS)                  31-Jan-2000