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J/ApJ/408/305    Cat of Stellar Lyman-Alpha Fluxes (Landsman+ 1993)
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A Catalog of Stellar Lyman-Alpha Fluxes
    Landsman W.B., Simon T.
    <Astrophys. J. 408, 305 (1993)>
    =1993ApJ...408..305L
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ADC_Keywords: Stars, emission; Photometry, hydrogen-line

Abstract: 
   The data file gives the measured Lyman alpha flux or upper limits for
   275 stars as derived from IUE spectra. The file is a subset of Table 1
   of Landsman and Simon in that when a star had multiple measurements,
   only the best measurement is included in this table. The spectral
   types, V and B-V magnitudes in the table are culled from various
   sources as described in the paper. Most of the measurements are
   derived from low-dispersion spectra, and those derived from high-
   dispersion spectra are flagged. Each measurement was assigned a data
   quality code according to the signal to noise after removal of the
   diffuse Lyman alpha background emission. 
      -1 - upper limit
       1 - good quality
       2 - fair quality
       3 - poor quality
       4 - contains saturated pixels
   The final column gives the ratio of the Ly alpha flux to the total
   bolometric flux of the star, determined as described in the paper. 
  
   A roundoff was applied to the fluxes listed here to give the fluxes
   listed in Table 1 of Landsman and Simon. 

File Summary:
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 FileName       Lrecl   Records    Explanations                          
--------------------------------------------------------------------------------
ReadMe             80         .    This file
table1.dat         80       275    Lyman-alpha fluxes 
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Byte-by-byte Description of file: table1.dat
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  Bytes  Format Units      Label    Explanations                   
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  1-10   A10    ---        Name     Star Name
 12-18   I7     ---        HD       HD number (0 if none)
 20-33   A14    ---        SpT      Spectral Type
 35-39   F5.2   mag        V        V magnitude
 41-45   F5.2   mag        B-V      B-V color
 47-51   I5     ---        Image    IUE SWP image number
 53-57   I5     s          ExpTim   IUE Exposure Time
 59-59   A1     ---        Disp     [H ] 'H' if high-dispersion spectrum
 61-61   A1     ---        UpLim    [ <] '<' if Ly flux is an upper limit  
 63-67   I5   10-13W/m2/nm LyFlux   Ly alpha flux (in 10-14 erg cm-2 s-1 A-1)
 69-70   I2     ---        Qual    *[-1,4]! Measurement quality 
 72-72   A1     ---        NUpLim   [ <] '<' if normalized Ly flux is an 
                                    upper limit
 74-80   F7.1 10-7         LyNorm   Normalized Flux [in 10-7 x normalization]
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Note on Qual: 
  Each measurement was assigned a data quality code according to the 
  signal to noise after removal of the diffuse Lyman alpha background 
  emission. 
     -1 - upper limit
      1 - good quality
      2 - fair quality
      3 - poor quality
      4 - contains saturated pixels

Remarks:
  The file has been checked by the CDS procedure anafile for compliance 
  with the format table.

References:
  CDS documentation standard modified with notes (referenced by a *)
  F. Ochsenbein (1993) URL ftp://cdsarc.u-strasbg.fr/pub/cats/docs.tex
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(End)          N. Paul M. Kuin  [NASA/NSSDC/ADC]                 18-Jul-1994