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J/AJ/112/2559                    Supergiants in NGC 672 (Sohn+ 1996)
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Supergiant stars in the disk of NGC 672
     Sohn Y.-J., Davidge T.J.
    <Astron. J. 112, 2559 (1996)>
    =1996AJ....112.2559S
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ADC_Keywords: Stars, supergiant ; Photometry, VRI

Abstract:
    V, R, and I CCD images are used to investigate the photometric
    properties and spatial distribution of supergiants in the nearby
    interacting galaxy NGC 672. Not counting stars imbedded in H II
    regions, our sample consists of 237 objects. The (V-R,V-I) two-color
    diagram indicates that the majority of these stars have spectral types
    between A-K. Statistical tests show that the outer region of NGC 672
    contains a redder population of supergiants than the inner region.
    Comparisons with theoretical evolutionary tracks indicate that the
    majority of the supergiants in NGC 672 have progenitor masses between
    15M_{sun}_ and 25M_{sun}_, and that the inner regions contain stars
    that are more massive than in the outer disk, indicating that an age
    gradient is present. The luminosity functions in all three bandpasses
    follow power laws, and the exponent in V=0.79+/-0.06, in good
    agreement with other galaxies. The brightest red supergiants occur at
    V~22.0, from which we derive a distance modulus of 29.5, corresponding
    to 7.9(+1.0)(-0.9)Mpc.

Objects:
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       RA   (2000)   DE      Designation(s)
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    01 47 53.2   +27 25 49   NGC 672
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File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
table2.dat      66        280   Positions, magnitudes, and colors of NGC 672
                                stars
table2.tex      92        306   AASTeX version of table2.dat
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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     ---    ID    Identification number
   5- 12  F8.3   pix    Xc    X pixel location (1)
  14- 20  F7.3   pix    Yc    Y pixel location (1)
  23- 27  F5.2   mag    Vmag  V magnitude
  29- 33  F5.2   mag  e_Vmag  rms uncertainty on Vmag
  35- 39  F5.2   mag    V-I   V-I color index
  41- 45  F5.2   mag  e_V-I   rms uncertainty on V-I
  47- 51  F5.2   mag    R-I   R-I color index
  53- 57  F5.2   mag  e_R-I   rms uncertainty on R-I
  60- 66  A7     ---    HII   H II region number from Hodge, 1969ApJ...155..417H
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Note (1): The field center is 01h 44min 52.3s, +27{deg} 10' 23" (1950),
           1 pix = 0.13"
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Origin: AAS CD-ROM series, Volume 7, 1996         Lee Brotzman [ADS] 06-Nov-1996
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(End)                                                         [CDS]  31-Jan-1997