.help exoleuv sep98 ftools.exosat
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NAME
exoleuv - Estimate the stellar UV countrate for different CMA filters
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USAGE
exoleuv filter sptype vmag bvmag 
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DESCRIPTION
   Exoleuv calculates a rough estimate of the stellar UV count rate
   in different CMA filter. Many observations of hot stars with EXOSAT 
   showed that UV radiation leaked through the filter to dominate the 
   X-ray count rate for bright enough UV sources. The 'exoleuv' provides 
   an estimate good to 50%. The calculation is based on a UV calibration 
   of the CMA done by Fritz Paerels with Sirius AB combined with an IUE 
   atlas of spectra of hot stars and Seaton's interstellar redding law.
   The estimates is given only for four of the CMA filters (3000 Lexan,
   4000 Lexan, Polypropylene and Aluminum/Parylene) and only for stars
   of spectral type O,B and A. In all other cases (different filter or 
   star spectral type) the UV count rate is set to zero.  
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PARAMETERS
.ls Filter [integer]
The EXOSAT CMA filter number. The input values are 7=3000 Lexan,
2=Polypropylene, 3=4000 Lexan, 6=Aluminum/Parylene.
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.ls Sptype [string]
The spectral type of the star e.g. O7 or B3 (no account is taken 
for the luminosity class).
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.ls Vmag [real]
V magnitude of the star.
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.ls BVmag [real]
E(B-V) color excess.
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EXAMPLES
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  Estimate UV rate in the EXOSAT CMA filter 3 (4000 Lexan) for a star of
  spectral type A1, magnitude 5.38 and  E(V-B)=0.02

 > exoleuv filter=3 sptype=A1 vmag=5.38 bvmag=-0.02
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