CDROM/AJ/V107/P1054     30 Doradus Region (Malmuth & Heap 1994)
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UBV Stellar Photometry of the 30 Doradus Region of the Large Magellanic Cloud
with the Hubble Space Telescope
      Eliot M. Malumuth & Sara R. Heap
      <1994, AJ, 107, 1054>
      =1994AJ....107.1054M
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Abstract:
  We report on Planetary Camera observations of the central region of 30
  Doradus in the Large Magellanic Cloud.  These images of 30 Doradus are
  the first "deep" HST exposures that have appropriate photometric
  calibration.  The B band (F439W) image, which shows R136a at the center
  of the PC6 CCD chip, reveals over 200 stars within 3" of the center of
  R136a, and over 800 stars in a 35"x35" area.  We used Malumuth et al.'s
  [The First Year of HST Observations, edited by A. L. Kinney and J. C.
  Blades (ST ScI, Baltimore) (1991)] PSF-fitting method to measure the
  magnitudes of all stars on the PC6 chip.  These new B magnitudes, along
  with U and V magnitudes from archival PC images, yield a luminosity
  function, mass density profile, and initial mass function of the 30
  Doradus ionizing cluster.  The mass distribution is well fit by a King
  model with a core radius, Rc = 0.96" (0.24 pc), a tidal radius, Rt =
  110" (28 pc), and a total mass, M = 16800 Msun.  Both the luminosity
  function and initial mass function show evidence for mass segregation,
  in the sense that the central region has a higher fraction of massive
  stars than the outer regions.  This is the first observational evidence
  for mass segregation in a very young cluster (age ~3 million years).
  The observations admit the hypothesis that the mass segregation
  occurred in the process of star formation and/or that the mass
  segregation is the result of dynamical evolution.


File Summary:
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File Name    Lrecl    Records    Explanations
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table2.dat      48       1010    30 Doradus photometry
aasman.sty      77        164    AASTeX manuscript style file
table2.tex      99       1130    LaTeX version of table 2
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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- 4   I4      ---        ID       Identification number
   5      1X      ---        ---      Blank
   6- 8   I3      h          RAh      Right ascension (J2000)
   9-11   I3      min        RAm      R.A.
  12-17   F6.2    s          RAs      R.A.
  18      1X      ---        ---      Blank
  19      A1      ---        DE-      Sign declination (J2000)
  20-21   I2      deg        DEd      Declination (J2000)
  22-24   I3      arcmin     DEm      Dec.
  25-29   F5.1    arcsec     DEs      Dec.
  30      1X      ---        ---      Blank
  31-36   F6.2    mag        U        []? Johnson U magnitude
  37-42   F6.2    mag        B        []? Johnson B magnitude
  43-48   F6.2    mag        V        []? Johnson V magnitude
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(End)                                             Lee Brotzman [ADS] 05-May-1994