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J/MNRAS/357/645     LMC far-UV HST observations              (Almoznino+, 2005)
The deepest Hubble Space Telescope far-ultraviolet observations in the
Large Magellanic Cloud.
    Almoznino E., Brosch N., Shara M., Zurek D.
   <Mon. Not. R. Astron. Soc., 357, 645-655 (2005)>
   =2005MNRAS.357..645A
ADC_Keywords: Magellanic Clouds ; Ultraviolet ; Photometry, CCD

Keywords: stars: formation - galaxies: individual: Large Magellanic Cloud -
          galaxies: irregular - galaxies: stellar content

Abstract:
    We present a new analysis of the deepest pure-ultraviolet (UV)
    observations with the highest angular resolution ever performed. A set
    of 12 exposures with the Hubble Space Telescope (HST) WFPC2 and F160BW
    filter obtained in parallel observing mode, which cover ∼12arcmin2 in
    the Large Magellanic Cloud (LMC), north of the bar and in the 'general
    field' region of the LMC, contain stars with far-UV monochromatic
    magnitudes as faint as 22mag. The 198 detected UV sources represent
    an accumulated exposure of 2x104s and reveal stars as faint as
    mUV≃20mag. We combine these observations with deep UBVI
    charge-coupled device (CCD) imaging of the same region reaching as
    faint as V≃26mag, and reselect probable optical counterparts for the
    UV sources. After a two-stage search-and-analysis process, we detect
    robust counterparts for 129 stars. These are mostly upper
    main-sequence stars, from early B to early A spectral classes, with
    several F stars. We point out the lack of blue supergiants, which
    could have been easily detected in our survey. We measure a foreground
    extinction E(B-V)≃0.08mag by Galactic dust and a surface density of
    star formation rate twice the average Galactic value. These
    observations indicate that relatively recent star formation took place
    even off the bar of the LMC.

Description:
    New optical observations of a small fraction of the LMC, including the
    area studied with the HST, were performed by MS using the CTIO 4-m
    Victor Blanco Telescope with the Mosaic II CCD imager.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       275      129   FUV (160nm) stars in the HST LMC field


See also:
    J/AJ/117/206 : LMC far-ultraviolet imaging (Brosch+, 1999)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     [BSM99]   UV source number, from Brosch et al.,
                                   1999, Cat. J/AJ/117/206
       4  A1    ---    m_[BSM99]  Multiplicity (for source #37) (1)
   5-  6  I2    ---     nObs      Number of observations
   8-  9  I2    h       RAh       HST right ascension (J2000.0)
      10  A1    ---     ---       [:]
  11- 12  I2    min     RAm       HST right ascension (J2000.0)
      13  A1    ---     ---       [:]
  14- 18  F5.2  s       RAs       HST right ascension (J2000.0)
      20  A1    ---     DE-       HST declination sign (J2000.0)
  21- 22  I2    deg     DEd       HST declination (J2000.0)
      23  A1    ---     ---       [:]
  24- 25  I2    arcmin  DEm       HST declination sign (J2000.0)
      26  A1    ---     ---       [:]
  27- 31  F5.2  arcsec  DEs       HST declination sign (J2000.0)
  33- 34  I2    h       RACh      Corrected right ascension (J2000.0)
      35  A1    ---     ---       [:]
  36- 37  I2    min     RACm      Corrected right ascension (J2000.0)
      38  A1    ---     ---       [:]
  39- 44  F6.3  s       RACs      Corrected right ascension (J2000.0)
      48  A1    ---     DEC-      Corrected declination sign (J2000.0)
  49- 50  I2    deg     DECd      Corrected declination (J2000.0)
      51  A1    ---     ---       [:]
  52- 53  I2    arcmin  DECm      Corrected declination sign (J2000.0)
      54  A1    ---     ---       [:]
  55- 59  F5.2  arcsec  DECs      Corrected declination sign (J2000.0)
  61- 65  F5.2  mag     UVmag     Far UV (F160BW, 160nm) magnitude
  67- 70  F4.2  mag     e_UVmag   rms uncertainty on UVmag
  72- 77  I6    ---    [ABS2005]  LMC optical counterpart number
  79- 86  F8.3  pix     Xpos      X position
  88- 94  F7.3  pix     Ypos      Y position
  96- 97  I2    h       RAOh      CCD right ascension (J2000.0)
      98  A1    ---     ---       [:]
  99-100  I2    min     RAOm      CCD right ascension (J2000.0)
     101  A1    ---     ---       [:]
 102-106  F5.2  s       RAOs      CCD right ascension (J2000.0)
     108  A1    ---     DEO-      CCD declination sign (J2000.0)
 109-110  I2    deg     DEOd      CCD declination (J2000.0)
     111  A1    ---     ---       [:]
 112-113  I2    arcmin  DEOm      CCD declination sign (J2000.0)
     114  A1    ---     ---       [:]
 115-119  F5.2  arcsec  DEOs      CCD declination sign (J2000.0)
 121-126  F6.3  mag     Imag      I magnitude
 128-132  F5.3  mag     e_Imag    rms uncertainty on Imag
     134  I1    ---     o_Imag    [3] Number of observations in I band
 136-141  F6.3  mag     Vmag      V magnitude
 143-147  F5.3  mag     e_Vmag    rms uncertainty on Vmag
     149  I1    ---     o_Vmag    [3] Number of observations in V band
 151-156  F6.3  mag     Bmag      B magnitude
 158-162  F5.3  mag     e_Bmag    rms uncertainty on Bmag
     164  I1    ---     o_Bmag    [3] Number of observations in B band
 166-171  F6.3  mag     Umag      U magnitude
 173-177  F5.3  mag     e_Umag    rms uncertainty on Umag
     179  I1    ---     o_Umag    [3] Number of observations in U band
 181-186  F6.3  mag     V-I       V-I colour index
 188-192  F5.3  mag     e_V-I     rms uncertainty on V-I
 194-199  F6.3  mag     B-V       B-V colour index
 201-205  F5.3  mag     e_B-V     rms uncertainty on B-V
 207-212  F6.3  mag     U-B       U-B colour index
 214-218  F5.3  mag     e_U-B     rms uncertainty on U-B
 220-225  F6.3  mag     U-V       U-V colour index
 227-231  F5.3  mag     e_U-V     rms uncertainty on U-V
 233-236  F4.2  arcsec  Dist      Distance between UV and optical source
 238-243  F6.3  mag     UV-I      UV-I colour index
 245-249  F5.3  mag     e_UV-I    rms uncertainty on UV-I
 251-256  F6.3  mag     UV-U      UV-U colour index
 258-262  F5.3  mag     e_UV-U    rms uncertainty on UV-U
 264-269  F6.3  mag     UV-V      UV-V colour index
 271-275  F5.3  mag     e_UV-V    rms uncertainty on UV-V

Note (1): in the original table, the source #37 appeared twice.
     The correct suffix was added at CDS in May 2007, according 
     to the original list of Brosch et al. (1999AJ....117..206B)


History:
  * 07-Feb-2006: From electronic version of the journal
  * 31-May-2007: Suffix added in table2 for source #37
(End)                                      Patricia Vannier [CDS]    07-Feb-2006