SUMMARY OF PROPOSAL 42013
DR. K. P. SINGH
NASA GODDARD SPACE FLIGHT CENTER
MD USA 20771
GREENBELT


  E-mail: KPS@ROSSERV.GSFC.NASA.GOV	Tel: 301 286 6699	Fax: 301 286 1681
  Medium: 4GBDAT

Subject: STARS                                                       
  Title: RS CVN BINARIES WITH A WHITE DWARF COMPANION: FF AQR, 39 CET AND 29 DRA.        


Abstract:
 RS CVn binaries with white dwarf companions are in a different evolutionary stage
 compared to classical RS CVns and appear anomalous in X-rays. Three such binaries,
 FF Aqr, 39 Cet and 29 Dra, have high X-ray luminosities (log Lx = 31.3 - 31.5), and
 ROSAT PSPC spectra of two of them show different temperatures compared to classical
 RS CVns. A compact star in such binaries could provide conditions for the mass
 accreted from the late-type star to emit X-rays competing with the coronal X-ray
 emission from active late-type companion. ASCA spectra will allow us to determine
 their spectral components, measure coronal abundances, and allow comparison to be
 made with the existing spectra of higher-gravity RS CVns and other similar systems without compact companions.

 Co-Is:
   1  S. A. DRAKE         	LHEA/GSFC                     USA       
      DRAKE@LHEAVX.GSFC.NASA.GOV	301-286-6962
   2  N. E. WHITE         	LHEA/GSFC                     USA       
   3  T. SIMON            	U. OF HAWAII                  USA       


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
FF AQR                 0  330.1508   -2.7407    40   N   N   P  0.11000   1