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J/ApJ/456/174          Intermediate-Mass Population in NGC 604 (Hunter+ 1996)
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The intermediate stellar mass population in NGC 604 determined from Hubble
Space Telescope Images
      Hunter D.A., Baum W.A., O'Neil Jr. E.J., Lynds R.
    <Astrophys. J. 456, 174 (1996)>
    =1996ApJ...456..174H
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ADC_Keywords: H II regions ; Stars, giant ; Photometry
Keywords: galaxies: individual (M33) - galaxies: photometry -
          galaxies: star clusters - galaxies: stellar content - HII regions -
          ISM: individual (NGC 604) - stars: luminosity function, mass function

Abstract:
    We present photometry of stars in the giant H II region NGC 604 in
    M33. The photometry is measured from Hubble Space Telescope images
    through the F336W, F555W, and F814W broadband filters. Color-
    magnitude diagrams of the stars in NGC 604 show a main sequence
    detected down to an M_F555W,0 of -1 (nearly 6M_{sun}_). In addition,
    there are luminous stars that are probably blue and red supergiants.
    Based on the previously known presence of Wolf-Rayet stars, we take
    the age of the cluster to be 3-5Myr. We measure an initial mass
    function for intermediate-mass stars (6.5-18M_{sun}_) that has a
    slope of -1.6+/-0.7. This slope is, within the uncertainties, similar
    to those found for OB associations in the Milky Way and Magellanic
    Clouds. The density of the luminous stars in NGC 604 is also
    comparable to that of OB associations in those galaxies even though
    the total number of stars is greater in NGC 604. A few subclamps have
    densities that are higher by as much as a factor of 10. A comparison
    with R136 in the LMC emphasizes that the formation of a large number
    of massive stars does not necessarily entail a high concentration of
    those stars.
Objects:
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        RA   (2000)   DE    Designation(s)
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    01 34 32.8   +30 47 04  NGC 604
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File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
table2.dat      90      34484   Photometry
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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-  6  I6     ---     Star         *Star identification number
   8- 13  F6.1   pix     X             X pixel coord relative to Fig. 1 in paper
  15- 20  F6.1   pix     Y             Y pixel coord relative to Fig. 1 in paper
  22- 27  F6.2   mag     F336W         ?=100.00 F336W magnitude
  29- 34  F6.2   mag   e_F336W         ?=100.00 F336W magnitude uncertainty
  36- 41  F6.2   mag     F555W         ?=100.00 F555W magnitude
  43- 48  F6.2   mag   e_F555W         ?=100.00 F555W magnitude uncertainty
  50- 55  F6.2   mag     F814W         ?=100.00 F814W magnitude
  57- 62  F6.2   mag   e_F814W         ?=100.00 F814W magnitude uncertainty
  64- 69  F6.2   mag     F336W-F555W   ?=100.00 F336W-F555W color
  71- 76  F6.2   mag   e_F336W-F555W   ?=100.00 F336W-F555W color uncertainty
  78- 83  F6.2   mag     F555W-F814W   ?=100.00 F555W-F814W color
  85- 90  F6.2   mag   e_F555W-F814W   ?=100.00 F555W-F814W color uncertainty
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Note on Star: Star identification number. The first significant digit is the
        chip number; the second is the stellar group number (cluster or
        background); and the rest is the individual star number.
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Origin: AAS CD-ROM series, Volume 6, 1996           Lee Brotzman [ADS] 22-Apr-96
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(End)                                                         [CDS]  05-Sep-1996