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J/AJ/122/1330       HST BVI photometry of M 81 star clusters (Chandar+, 2001)
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Compact star clusters in M81.
 I. Data from Hubble Space Telescope Wide Field Planetary Camera 2 imaging.
    Chandar R., Ford H.C., Tsvetanov Z.
   <Astron. J. 122, 1330 (2001)>
   =2001AJ....122.1330C
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ADC_Keywords: Associations, stellar ; Photometry, Cousins
Keywords: galaxies: individual (M81) - galaxies: star clusters -
          galaxies: stellar content

Abstract:
    In this paper, we present the discovery of 114 compact star clusters
    in the nearby spiral galaxy M81 from B-, V-, and I-band Hubble Space
    Telescope Wide Field Planetary Camera 2 imaging in eight fields,
    covering a total area of ~40arcmin^2^. The fields sample a variety of
    environments (both spiral and interarm regions), as well as a range of
    projected galactocentric distances from 2 to 12kpc. The sample is
    complete to V~22, deeper by ~1mag than any previous cluster survey in
    M81. We present details of the separation of clusters from both
    stellar sources and background galaxies, which has been based solely
    on structural parameters and morphology and not using any color cuts,
    as is necessary for ground-based surveys. We present magnitudes and
    colors of detected clusters. Surface brightness profiles are compared
    with single-mass King models, giving a range of core radii for the
    clusters in our sample between 0.2 and 7pc.

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table2.dat     89      114   The cluster sample and properties
table3.dat     47       11   Comparison of photometry with previous work
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Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label     Explanations
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   1-  3  I3    ---     [CFT2001] Cluster identification number
       5  I1    h       RAh       Right Ascension (J2000)
   7-  8  I2    min     RAm       Right Ascension (J2000)
  10- 14  F5.2  s       RAs       Right Ascension (J2000)
      16  A1    ---     DE-       Declination sign (J2000)
  17- 18  I2    deg     DEd       Declination (J2000)
  20- 21  I2    arcmin  DEm       Declination (J2000)
  23- 28  F6.3  arcsec  DEs       Declination (J2000)
  30- 33  F4.1  kpc     GCDis     Deprojected galactocentric distance (1)
  35- 40  F6.3  mag     Vmag      The V band magnitude (Johnson-Cousins)
  42- 46  F5.3  mag   e_Vmag      Uncertainty in Vmag (2)
      48  A1    ---   f_Vmag      [ab] Flag on Vmag (3)
  50- 53  F4.2  arcsec  ColRad    The color radius
  55- 60  F6.3  mag     B-V       The (B-V) color (Johnson-Cousins)
  62- 66  F5.3  mag   e_B-V       Uncertainty in B-V (2)
  68- 73  F6.3  mag     V-I       The (V-I) color (Johnson-Cousins)
  75- 79  F5.3  mag   e_V-I       Uncertainty in V-I (2)
  81- 84  F4.2  mag     E(B-V)    The local reddening (see section 3.7)
  86- 88  F3.1  pc      CoreRad   Cluster core radius (see section 4)
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Note (1): Provided the cluster is in the plane of M81.
Note (2): The uncertainties take into account the object count rate,
    sky variance, and instrument gain. Uncertainty in color (in the given
    color radius) is estimated by propagating uncertainties in both
    filters to reflect the error in the two filter measurements.
Note (3): Note on Vmag:
      a = Near edge of CCD. V magnitude given in 0.4" radius;
      b = V magnitude given in 0.7" radius.
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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    ---     [CFT2001] Cluster identification number
   5- 10  F6.3  mag     Vmag      V magnitude (this work)
  12- 16  F5.3  mag     B-V       B-V colour index (this work)
  18- 24  A7    ---     Name      Other name (1)
      26  A1    ---   n_Name      [a] Note on Name (2)
  28- 32  F5.2  mag     Vmag2     ? V magnitude (previous work)
  34- 37  F4.2  mag     B-V2      ? B-V colour index (previous work)
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Note (1): Identifications:
     GTK NN  = [GTK91b] NN, Georgiev et al., 1991PAZh...17..387G
     IdNNNNN = [PBH95] NNNNN Perelmuter et al., 1995AJ....110..620P
Note (2): There are two objects listed with the same name (GTK 48) in the
    Georgiev et al. (1993BSAO...36...43G) work. These were matched to our
    objects by coordinates.
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History:
    From electronic version of the journal
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(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    14-Jan-2002