SUMMARY OF PROPOSAL 42027
DR KOJI MUKAI
NASA-GSFC/USRA
MD USA 20771
GREENBELT


  E-mail: MUKAI@LHEAVX.GSFC.NASA.GOV	Tel: (301) 286-9447	Fax: (301) 286-1684
  Medium: 4GBDAT

Subject: CATACLYSMIC VARIABLES                                       
  Title: THE HARD X-RAY COMPONENT OF THE SOFT INTERMEDIATE POLAR RX J0558.0+5353         


Abstract:
 RX J0558.0+5353 belongs to the intermediate polar (IP) subclass of magnetic
 cataclysmic variables, several members of which have been observed with ASCA. What
 distinguishes this IP from others is that (1) it has a distinct soft X-ray
 component; and (2) optical and soft X-ray emissions from this IP are modulated twice
 per 545.45 s spin period. We propose the first hard X-ray observation of this IP. We
 will compare the spin pulse profiles at different energies, and perform
 phase-resolved spectroscopy. Such studies are essential to evaluate the energy
 budget (soft to hard X-ray luminosity ratio) of this system and to understand the
 origin of the twice per spin pulsation in soft X-rays. will also study emission line intensity ratios to infer the white dwarf mass.

 Co-Is:
   1  MANABU ISHIDA       	ISAS                          JAPAN     
      (No Co-I contact data)
   2  RYUICHI FUJIMOTO    	ISAS                          JAPAN     
   3  KEICHI MATSUZAKI    	ISAS                          JAPAN     
   4  COEL HELLIER        	UNIV. KEELE                   UK        


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
RX J0558.0+5353        0   89.5012   53.8994    80   N   Y   P  1.00000   1