SUMMARY OF PROPOSAL 42052
DR NICHOLAS E WHITE
GODDARD SPACE FLIGHT CENTER
MD USA 20771
GREENBELT
CODE 668

  E-mail: WHITE@ADHOC.GSFC.NASA.GOV	Tel: 301 286 8443	Fax: 301 286 1684
  Medium: 4GBDAT

Subject: X-RAY BINARIES                                              
  Title: THE ACCRETION DISK CORONA SOURCE 4U1822-37                                      


Abstract:
 We propose to make an ASCA observation of 4U1822-37 simultaneously with XTE in order
 to determine the 0.5-200 keV spectrum. A previous ASCA observation of 4U1822-37
 shows a narrow iron K line at 6.4 keV and a warm iron absorption edge at 7.2 keV.
 There is also evidence for a Compton broadened iron K line centered on 6 keV, but
 this feature is very dependant on the assumed continuum model, which is poorly
 determined. The simultaneous XTE measurement is crucial to determine the overall spectral shape.

 Co-Is:
   1  ALAN SMALE          	LHEA/GSFC                     USA       
      SMALE@OSIRIS.GSFC.NASA.GOV	301 286 7063
   2  TIM KALLMAN         	LHEA/GSFC                     USA       
   3  LEV TITARCHUK       	GEORGE MASON UNIV.            USA       
   4  LORELLA ANGELINI    	LHEA/GSFC                     USA       
   5  MICHIEL VAN DER KLIS	UNIV. OF AMSTERDAM            NETH      


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
4U1822-37              0  276.4446  -37.1050    40   N   N   P  10.00000   1 

REMARKS:  THIS OBSERVATION IS SIMULTANEOUS WITH XTE. THE XTE OBSERVATION WILL FOLLOW
          THE ASCA TIMELINE.