ADC/CDS Standard Document for Catalog:
/catalogs/3/3083/

1. Use the ADC Data Viewer Suite to visualize the data.
2. Get the data files via anonymous FTP. (See Note.)

III/83      IUE Low-Dispersion Reference Atlas I, Normal Stars (Heck+ 1984)
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IUE Low-Dispersion Spectra Reference Atlas. I. Normal Stars
    Heck A., Egret D., Jaschek M., Jaschek C.
    <ESA SP-1052 (1984)>
    <Astron. Astrophys. Suppl. Ser. 57, 213 (1984)>
    =1984A&AS...57..213H
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ADC_Keywords: Spectrophotometry; Spectra, ultraviolet
Mission_Name: IUE

Description:
   The atlas contains the fluxes (2 angstroms/step) of 229 low-dispersion
   stellar spectra collected by the International Ultraviolet Explorer (IUE)
   satellite, compiled for the purpose of establishing reference spectral
   sequences in the ultraviolet range.  The sequences have been constructed
   and the standard stars selected directly from the ultraviolet material,
   staying as far as possible within the general MK frame.  The catalog is
   essentially composed of stars exhibiting normal behaviour in the
   ultraviolet.  A few peculiar objects have, however, been included as an
   illustration of typical abnormalities.  This work clearly pointed out the
   dangers of extrapolating a spectral classification based on a given
   wavelength range to another one, and, in particular, of using the MK
   spectral type alone outside its definition range.

File Summary:
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 FileName     Lrecl  Records   Explanations
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ReadMe           80        .   This file
catalog.dat      80    46945   Calibrated fluxes for each source
sources.dat      44      229   List of sources
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Byte-by-byte Description of file: catalog.dat
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   Bytes Format  Units       Label   Explanations
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   2- 13  A12    ---         ID     *Identification of the star (preferably HD)
  14- 20  I7     10-17W/m2/A Fmax   *Maximum flux on plot
  22- 24  I3     ---         Num     Record number for the star
  26- 29  I4     0.1nm       Lambda  Wavelength for first flux value in record
  31- 40  E10.4  mW/m2/A     Flux1  *Calibrated absolute fluxes
                                       (erg s-1 cm-2 A-1)
  41- 50  E10.4  mW/m2/A     Flux2   Flux for ({Lambda} + 2A)
  51- 60  E10.4  mW/m2/A     Flux3   Flux for ({Lambda} + 4A)
  61- 70  E10.4  mW/m2/A     Flux4   Flux for ({Lambda} + 6A)
  71- 80  E10.4  mW/m2/A     Flux5   Flux for ({Lambda} + 8A)
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Note on ID:
   Each star occupies 205 records of the catalog. ID is repeated. For a list
     of the sources in order of appearance in this file, please see
     sources.dat.

Note on Fmax:
   Value used as maximum on the y-axis when plotting the spectrum for the
     atlas. Repeated on each line for same star.
   (unit : 10-14 erg cm-2 A-1 s-1)

Note on Flux1:
   Each star has fluxes given for wavelengths 1153A to 3201A stepped by 2A.
     Five fluxes are given per record. The 205 records for each star are
     labeled in the Num field.
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Byte-by-byte Description of file: sources.dat
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   Bytes Format Units               Label Explanations
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   2-  3  I2    h                   RAh   Right Ascension 2000 (hours)
   5-  6  I2    min                 RAm   Right Ascension 2000 (minutes)
   8- 11  F4.1  s                   RAs   Right Ascension 2000 (seconds)
      13  A1    ---                 DE-   Declination 2000 (sign)
  14- 15  I2    deg                 DEd   Declination 2000 (degrees)
  17- 18  I2    arcmin              DEm   Declination 2000 (minutes)
  20- 21  I2    arcsec              DEs   Declination 2000 (seconds)
  25- 36  A12   ---                 ID    Identification of the star
                                            (preferably HD)
  38- 44  I7    10-17W/m2/Angstroem Fmax  Maximum flux on atlas plot of spectrum
--------------------------------------------------------------------------------

Remarks and Modifications:
  Francois Ochsenbein [CDS]   03-Dec-1993
  The original file has been transformed to allow easier computer reading:
  the redundant 1025 wavelength values (1153 to 3201 stepped by 2) were removed,
  floating-point numbers were normalized with the addition of the "E" between
  the mantissa and the exponent.

  Julie Anne Watko [ADC]   02-JAN-1997
  The data file had been formatted with one line per star. The old 10270 byte
  records were difficult to read on some computers. Fluxes were reformatted
  to accommodate an 80 byte logical record length. Running numbers and
  wavelengths were added. sources.dat was created, and the Intro document
  from CDS was updated.

  The 2000-position of stars was added at CDS (F.O., 08-Oct-1997)
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(End)                                  Julie Anne Watko [SSDOO/ADC]  02-Jan-1997