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J/ApJ/413/604                  30 Dor                              (Hill+, 1993)
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30 Doradus: ultraviolet and optical stellar photometry
    Hill J.K., Bohlin R.C., Cheng K.-P., Fanelli M.N., Hintzen P.,
    O'Connell R.W., Roberts M.S., Smith A.M., Smith E.P., Stecher T.P.
    <Astrophys. J. 413, 604 (1993)>
    =1993ApJ...413..604H      (SIMBAD/NED Reference)
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ADC_Keywords: Magellanic Clouds; H II regions; Photometry;
              Photometry, ultraviolet; Spectral types; Extinction
Keywords: dust, extinction - ISM: individual (30 Doradus) - Magellanic Clouds -
          techniques: photometric - ultraviolet: stars

Abstract:
   Ultraviolet Imaging Telescope (UIT) UV magnitudes in four bands, together 
   with optical B magnitudes, are presented for up to 314 early-type stars 
   located in a 9.7 x 9.7 arcmin field centered on R136. The magnitudes have
   an rms uncertainty estimated at 0.10 mag from a comparison between the UIT 
   magnitudes and the IUE spectra.  Spectral types and E(B-V) color excesses 
   are estimated. The mean color excesses following the two extinction curves 
   agree well with the predictions of the two-component extinction model of 
   Fitzpatrick and Savage (1984). However, the degree of nebular extinction 
   is found to vary systematically by large amounts over the 30 Dor field.
   The minimum of nebular extinction in the central parts of the nebula 
   suggests that dust has been expelled from this region by stellar winds. It 
   is suggested that the form of the UV extinction curve can be understood as 
   a consequence of the evolutionary state of the stellar population 
   responsible for making the dust grains. 

File Summary:
--------------------------------------------------------------------------------
 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table3          54        314    Stellar UV and B photometry
table5          32        314    Fit spectral types and extinctions
table3.tex      68        365    LaTeX version of table3
table5.tex      66        357    LaTeX version of table5
aastab.sty      72        115    Style for LaTeX version
environ.tex     77        125    Format for LaTeX version
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Byte-by-byte Description of file: table3
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   Bytes Format  Units   Label    Explanations
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   1-  4  I4     ---     UIT      Ultraviolet Imaging Telescope (UIT) number
   6- 12  F7.1   arcsec  dRA      Right ascension (2000) offset from R136
                                   (= 5:38:42)
  13- 19  F7.1   arcsec  dDE      Declination (2000) offset from R136
                                   (= -69:6:1)
  20- 26  F7.2   mag     m162     []? m_162 magnitude in the UIT B5 band
  27- 33  F7.2   mag     m189     []? m_189 magnitude in the UIT A2 band
  34- 40  F7.2   mag     m221     []? m_221 magnitude in the UIT A4 band
  41- 47  F7.2   mag     m256     []? m_256 magnitude in the UIT A5 band
  48- 54  F7.2   mag     B        []? B magnitude in the optical B band
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Byte-by-byte Description of file: table5
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   Bytes Format  Units  Label    Explanations
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   1-  4  I4     ---    UIT      Ultraviolet Imaging Telescope (UIT) number
   7- 14  A8     ---    SP       Estimated spectral type
  15- 20  F6.2   mag    E(B-V)F  Estimated F curve E(B-V)_F (Fitzpatrick 1985)
  21- 26  F6.2   mag    E(B-V)FS Estimated FS curve E(B-V)_FS (Fitzpatrick 1984)
  27- 32  F6.2   ---    RMS      Estimated rms magnitude differences between
                                  the best-fit model and the observations
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References:
Fitzpatrick E.L., 1985, ApJ, 299, 219
Fitzpatrick E.L. & Savage B.D., 1984, ApJ, 279, 578
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Origin: AAS CD-ROM series, Volume 1, 1993
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(End)                                         Patricia Bauer [CDS]   16-Sep-1994