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J/ApJ/452/210       UBV photometry in LH 47/48    (Oey+ 1995)
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Triggered star formation and the dynamics of a superbubble in the LMC:
the OB association LH 47/48 in DEM 152
    Oey M.S., Massey P.
   <Astrophys. J. 452, 210 (1995)>
   =1995ApJ...452..210O      (SIMBAD/NED BibCode)
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ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Photometry, UBV
Keywords: galaxies: star clusters - ISM: bubbles - ISM: individual (DEM 152) -
          Magellanic Clouds - stars: formation

Abstract:
    We examine the stellar population of an OB association, LH 47/48,
    which is associated with a superbubble H II region, DEM 152 in the N44
    nebular complex of the Large Magellanic Cloud. With CCD photometry and
    spectroscopy of the massive stars, we find no evidence that an unusual
    stellar population gave rise to the shell morphology of the gas. The
    slope of the initial mass function, {GAMMA}=1.3+/-0.2, is consistent
    with that of other OB associations in the LMC, and there is no
    significant difference in the initial mass function internal or
    external to the supershell. The inferred stellar ionizing flux is
    consistent with the observed nebular H alpha flux. We do find evidence
    for triggered star formation: the H-R diagram suggests an age of
    >10Myr for the population interior to the bubble with more recent,
    <5Myr, star formation on the exterior. Using the detailed data on the
    stellar population, we compare a numerical form of the Weaver et al.
    (1977ApJ...218..377W) evolutionary model for wind-driven bubbles with
    the observed shell kinematics. We find a substantial discrepancy: the
    observed shell radius is too small and/or expansion velocity too large
    to be explained with this version of the model. We discuss possible
    explanations for the inconsistency.

Objects:
    ----------------------------------------------------------
       RA   (2000)   DE    Designation(s)
    ----------------------------------------------------------
    05 22.0    -67 57      LH 47 = HD 35814 = NGC 1935
    05 22.5    -67 53      LH 48 = NGC 1937
    ----------------------------------------------------------

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1a            38      450   Photometry of stars in LH 47
table1b            34      195   photometry of stars in LH 48
table2             98       65   Derived parameter stars with spectral types
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Byte-by-byte Description of file: table1a table1b
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   Bytes Format Units   Label     Explanations
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   1-  3  I3    ---     Star      Star number
       4  A1    ---   m_Star      Multiuplicity index on Star
   6- 10  F5.1  pix     Xpos      X position
  12- 16  F5.1  pix     Ypos      Y position
  18- 22  F5.2  mag     Vmag      V magnitude
  24- 28  F5.2  mag     B-V       B-V colour index
  30- 34  F5.2  mag     U-B       U-B colour index
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Byte-by-byte Description of file: table2
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   Bytes Format Units   Label     Explanations
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   1-  9  A9    ---     Star      Star designation
  11- 15  F5.1  pix     Xpos      X position
  17- 21  F5.1  pix     Ypos      Y position
  23- 24  I2    h       RAh       Right ascension (J2000)
  26- 27  I2    min     RAm       Right ascension (J2000)
  29- 33  F5.2  s       RAs       Right ascension (J2000)
      35  A1    ---     DE-       Declination sign
  36- 37  I2    deg     DEd       Declination (J2000)
  39- 40  I2    arcmin  DEm       Declination (J2000)
  42- 45  F4.1  arcsec  DEs       Declination (J2000)
  47- 51  F5.2  mag     Vmag      V magnitude
  53- 57  F5.2  mag     B-V       B-V colour index
  59- 63  F5.2  mag     U-B       U-B colour index
  65- 69  F5.2  ---     Q         Reddening-free parameter (Q=(U-B)-0.72(B-V))
  71- 75  F5.3  [K]     log(Teff) Effective temperature
      76  A1    ---   u_log(Teff) [)] Uncertainty flag on log(Teff)
  78- 81  F4.1  mag     Mbol      Bolometric magnitude
      82  A1    ---   u_Mbol      [)] Uncertainty flag on Mbol
  84- 85  I2    solMass Mass      Star mass
      86  A1    ---   u_Mass      [)] Uncertainty flag on Mass
  88- 98  A11   ---     SpType    Spectral type
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History: Prepared via OCR at CDS.
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(End)                           James Marcout, Patricia Bauer [CDS]  07-Apr-1997